Nursyuhani Che Husain, Nurul Athirah Zawawi, F. Hamzah, Miradatul Najwa Mohd Rodhi, H. Veny, D. Ariyanti, N. A. Mohidem
The residual carbon from the carbide industry in Malaysia has been explored as a precursor in activated carbon (ACs) processing via chemical activation with potassium hydroxide (KOH). The residual carbon from the carbide industry consists of high fixed carbon content and is a sustainable source of raw material, making it a promising precursor for ACs processing. However, the synergy between activation temperature with impregnation ratio has yet to be well explored for precursors from carbide processing. Thus, in the present work, impregnation ratios from 1:1 to 1:5 and temperature for the activation process from 300°C to 700°C were examined in the ACs processing. The impact of these factors was evaluated towards the chemical characteristic of the derived ACs, such as pores and surface morphology, functional groups, and thermal profile. The finding indicated that the ratio of as-received carbon /KOH from 1:1 to 1:5 provided ACs with BET surface areas of 130 – 458 m2 /g and micropores content of 19 – 25.75%. The results suggested that the highest BET surface area in this range of study was 458.15 m2 /g at an activation temperature of 700oC and an impregnation ratio of 1:1. Then the developed ACs were further evaluated in carbon dioxide (CO2) adsorption using breakthrough CO2 adsorption. The breakthrough time and CO2 adsorption rate capacity were calculated as 70 s and 0.175 mmol/g, respectively. This finding indicated that as-received carbon precursors from the carbide industry could be explored as one of the potential materials in ACs development, forming the microporous structure during KOH activation and encouraging the binding of CO2 molecules in CO2 capture.
{"title":"Chemical Properties and Breakthrough Adsorption Study of Activated Carbon Derived from Carbon Precursor from Carbide Industry","authors":"Nursyuhani Che Husain, Nurul Athirah Zawawi, F. Hamzah, Miradatul Najwa Mohd Rodhi, H. Veny, D. Ariyanti, N. A. Mohidem","doi":"10.22146/ajche.80035","DOIUrl":"https://doi.org/10.22146/ajche.80035","url":null,"abstract":"The residual carbon from the carbide industry in Malaysia has been explored as a precursor in activated carbon (ACs) processing via chemical activation with potassium hydroxide (KOH). The residual carbon from the carbide industry consists of high fixed carbon content and is a sustainable source of raw material, making it a promising precursor for ACs processing. However, the synergy between activation temperature with impregnation ratio has yet to be well explored for precursors from carbide processing. Thus, in the present work, impregnation ratios from 1:1 to 1:5 and temperature for the activation process from 300°C to 700°C were examined in the ACs processing. The impact of these factors was evaluated towards the chemical characteristic of the derived ACs, such as pores and surface morphology, functional groups, and thermal profile. The finding indicated that the ratio of as-received carbon /KOH from 1:1 to 1:5 provided ACs with BET surface areas of 130 – 458 m2 /g and micropores content of 19 – 25.75%. The results suggested that the highest BET surface area in this range of study was 458.15 m2 /g at an activation temperature of 700oC and an impregnation ratio of 1:1. Then the developed ACs were further evaluated in carbon dioxide (CO2) adsorption using breakthrough CO2 adsorption. The breakthrough time and CO2 adsorption rate capacity were calculated as 70 s and 0.175 mmol/g, respectively. This finding indicated that as-received carbon precursors from the carbide industry could be explored as one of the potential materials in ACs development, forming the microporous structure during KOH activation and encouraging the binding of CO2 molecules in CO2 capture.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43314030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Shofinita, D. Lestari, Sekar Ayu Ambarwati, Karen Christine Gunawan, Amarthya Benigna Achmadi
Defective coffee beans amount to 15-20% of the total produced coffee beans. The defective coffee bean contains caffeine, which can negatively affect the human body, such as increased heart rate, and thus sensitive to consumption by some people. This study aims to optimize the decaffeination process of defective coffee beans. The extraction of aroma and flavor compounds was done by maceration, and the decaffeination was carried out using palm oil as a solvent. The type of beans (green and roasted beans), the decaffeination contact time, and the ratio between coffee bean extract and solvent were varied in this study. The caffeine content was quantified, and the organoleptic and color tests were done on the concentrated coffee extracts. It was found that the higher the amount of solvent volume in decaffeination, the higher the caffeine decrease. In addition, the longer the green beans’ decaffeination time, the lower the caffeine decrease. Decaffeination using green coffee beans resulted in a greater reduction of caffeine (6.515-48.241%) than roasted coffee beans (8.495-24.272%). The optimum operating condition of green coffee bean decaffeination was the coffee bean extract and solvent ratio of 1:5.82 and the decaffeination time of 26.5 minutes. The organoleptic test result shows that decaffeinated coffee flavor had the same preferability as the commercial coffee flavor and was thus able to compete in the market.
{"title":"Optimization of Defective Coffee Beans Decaffeination Using Palm Oil","authors":"D. Shofinita, D. Lestari, Sekar Ayu Ambarwati, Karen Christine Gunawan, Amarthya Benigna Achmadi","doi":"10.22146/ajche.73387","DOIUrl":"https://doi.org/10.22146/ajche.73387","url":null,"abstract":"Defective coffee beans amount to 15-20% of the total produced coffee beans. The defective coffee bean contains caffeine, which can negatively affect the human body, such as increased heart rate, and thus sensitive to consumption by some people. This study aims to optimize the decaffeination process of defective coffee beans. The extraction of aroma and flavor compounds was done by maceration, and the decaffeination was carried out using palm oil as a solvent. The type of beans (green and roasted beans), the decaffeination contact time, and the ratio between coffee bean extract and solvent were varied in this study. The caffeine content was quantified, and the organoleptic and color tests were done on the concentrated coffee extracts. It was found that the higher the amount of solvent volume in decaffeination, the higher the caffeine decrease. In addition, the longer the green beans’ decaffeination time, the lower the caffeine decrease. Decaffeination using green coffee beans resulted in a greater reduction of caffeine (6.515-48.241%) than roasted coffee beans (8.495-24.272%). The optimum operating condition of green coffee bean decaffeination was the coffee bean extract and solvent ratio of 1:5.82 and the decaffeination time of 26.5 minutes. The organoleptic test result shows that decaffeinated coffee flavor had the same preferability as the commercial coffee flavor and was thus able to compete in the market.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41342495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kindriari Nurma Wahyusi, Ika Nawang Puspitawati, Abdul Rachman Wirayudha
The electrolyte or ion conductor acts as a bridge to transfer the ions the electrodes generate. In general, electrolytes are in the form of liquids. However, liquid electrolytes have drawbacks, including needing to be more practical and leaking quickly. Therefore, people switch to solid matrix electrolytes as battery electrolytes. An ideal solid electrolyte membrane must have chemical stability, thermal stability, high ionic conductivity, high flexibility, low cost, and abundant material availability. Lithium extraction from used batteries using Deep Eutectic Solvent (DES) was found to be an intelligent solvent. Mixing the method with lithium salt on a chitosan membrane can increase conductivity. This study aims to determine the lowest resistance value and highest conductivity of solid polymer electrolytes using Li2CO3 from used batteries. After separating the Lithium-Cobalt component from the used battery, it was extracted with deep DES solvent and precipitated using Na2CO3 to produce the Li2CO3 compound. Polymer electrolyte was synthesized by mixing polyvinyl alcohol and adding 0.2 grams, 0.4 grams, 0.6 grams, 0.8 grams, and 1 gram of chitosan. Li2CO3 variables are 0.2 grams, 0.4 grams, 0.6 grams, 0.8 grams, and 1 gram. The results showed that the higher content of chitosan and Li2CO3 led to an increase in ionic conductivity. These results concluded that the best solid electrolyte membrane was obtained with a variation ratio of 0.2 grams of chitosan with the addition of 1 gram of Li2CO3.
{"title":"The Deep Eutectic Solvent in Used Batteries as an Electrolyte Additive for Potential Chitosan Solid Electrolyte Membrane","authors":"Kindriari Nurma Wahyusi, Ika Nawang Puspitawati, Abdul Rachman Wirayudha","doi":"10.22146/ajche.77318","DOIUrl":"https://doi.org/10.22146/ajche.77318","url":null,"abstract":"The electrolyte or ion conductor acts as a bridge to transfer the ions the electrodes generate. In general, electrolytes are in the form of liquids. However, liquid electrolytes have drawbacks, including needing to be more practical and leaking quickly. Therefore, people switch to solid matrix electrolytes as battery electrolytes. An ideal solid electrolyte membrane must have chemical stability, thermal stability, high ionic conductivity, high flexibility, low cost, and abundant material availability. Lithium extraction from used batteries using Deep Eutectic Solvent (DES) was found to be an intelligent solvent. Mixing the method with lithium salt on a chitosan membrane can increase conductivity. This study aims to determine the lowest resistance value and highest conductivity of solid polymer electrolytes using Li2CO3 from used batteries. After separating the Lithium-Cobalt component from the used battery, it was extracted with deep DES solvent and precipitated using Na2CO3 to produce the Li2CO3 compound. Polymer electrolyte was synthesized by mixing polyvinyl alcohol and adding 0.2 grams, 0.4 grams, 0.6 grams, 0.8 grams, and 1 gram of chitosan. Li2CO3 variables are 0.2 grams, 0.4 grams, 0.6 grams, 0.8 grams, and 1 gram. The results showed that the higher content of chitosan and Li2CO3 led to an increase in ionic conductivity. These results concluded that the best solid electrolyte membrane was obtained with a variation ratio of 0.2 grams of chitosan with the addition of 1 gram of Li2CO3.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43041540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Dermawan, Lukman Al Ghani, Aditya Bayu Prawidya
Urea-formaldehyde (UF) resin binders for wood-based panel production often use melamine as an additive to improve both mechanical properties and environmental compliance. Direct fortification for efficient use of melamine remains a problem due to low solubility. Pizzi & coworkers suggested the use of more soluble melamine salts and demonstrated success in terms of product performance. However, their preparation method showed low productivity and inefficient use of material and energy. In their scheme, a batch reactor fed with 1 kg of water and 75 g of a stoichiometric amount of melamine and acetic acid produced only around 25 g of solid melamine acetate crystal. In contrast, the remaining 50 g remained dissolved in 991 g of water, which requires high of energy to evaporate. This paper reports an attempt to increase batch productivity and work towards the more efficient use of material and energy. The experiment showed that the successive addition of melamine and acetic acid to the batch up to the solubility limit of melamine at the same reaction condition increased melamine and acetic acid fed from 75 g to 165 g. This was followed by a significant increase in dry crystal yield from 25 g to 117 - 132 g. Feeding the mother liquor to the next batch decreased the water use to only 8% of the original requirement. This resulted in a highly efficient process, eliminating the need for energy-intensive melamine acetate recovery from the mother liquor. The addition of 2% - 4% wt. of the product to UF resin resulted in particleboard with significantly lower thickness swelling, an increase in MOR & IB strength, and lower formaldehyde emission.
{"title":"Melamine Acetate Preparation as a Urea-Formaldehyde Resin Additive for Particleboard Production","authors":"D. Dermawan, Lukman Al Ghani, Aditya Bayu Prawidya","doi":"10.22146/ajche.79192","DOIUrl":"https://doi.org/10.22146/ajche.79192","url":null,"abstract":"Urea-formaldehyde (UF) resin binders for wood-based panel production often use melamine as an additive to improve both mechanical properties and environmental compliance. Direct fortification for efficient use of melamine remains a problem due to low solubility. Pizzi & coworkers suggested the use of more soluble melamine salts and demonstrated success in terms of product performance. However, their preparation method showed low productivity and inefficient use of material and energy. In their scheme, a batch reactor fed with 1 kg of water and 75 g of a stoichiometric amount of melamine and acetic acid produced only around 25 g of solid melamine acetate crystal. In contrast, the remaining 50 g remained dissolved in 991 g of water, which requires high of energy to evaporate. This paper reports an attempt to increase batch productivity and work towards the more efficient use of material and energy. The experiment showed that the successive addition of melamine and acetic acid to the batch up to the solubility limit of melamine at the same reaction condition increased melamine and acetic acid fed from 75 g to 165 g. This was followed by a significant increase in dry crystal yield from 25 g to 117 - 132 g. Feeding the mother liquor to the next batch decreased the water use to only 8% of the original requirement. This resulted in a highly efficient process, eliminating the need for energy-intensive melamine acetate recovery from the mother liquor. The addition of 2% - 4% wt. of the product to UF resin resulted in particleboard with significantly lower thickness swelling, an increase in MOR & IB strength, and lower formaldehyde emission.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45387445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Indro Sumatri, Hadiyanto Hadiyanto, S. Suherman, M. Christwardana
Biodiesel is produced from oils esterified with alcohol into glycerol and water. Vegetable edible oil raw materials are the main consideration in biodiesel production. This study used three types of oil, namely palm oil (PO), waste frying oil (WFO), soybean oil (SO), and corn oil (CO), with the catalyst of the enzyme lipase. The price of WFO as raw materials is low, although it must be controlled acid and water levels. In the research run, the oil mixture consists of two types of oils mixed with a certain composition and the addition of certain lipase enzymes. The research resulted that the yield produced by multi-feedstock biodiesel with free fatty acid (FFA) < 2 was 89.7%, 89.03%, and 86.11% higher than the sample with FFA > 2 at 79.54%, 74.66%, and 73.33%, respectively. The minimum density produced is a mixture of WFO with CO of 861.1 kg/m3. The largest viscosity produced is a mixture of WFO with SO of 18.03 mm2/s. Mixing raw materials can lower the number of iodine multi-feedstock biodiesel. The number of acids produced by multi-feedstock biodiesel exceeds ASTM standards. The total glycerol produced by multi-feedstock biodiesel varies, whereby a multi-feedstock blend of PO can lower total glycerol. In contrast, a multi-feedstock blend of WFO tends to produce high total glycerol.
{"title":"Production of Biodiesel Using Enzymatic Esterification of Multi-Feedstock Oils","authors":"Indro Sumatri, Hadiyanto Hadiyanto, S. Suherman, M. Christwardana","doi":"10.22146/ajche.79208","DOIUrl":"https://doi.org/10.22146/ajche.79208","url":null,"abstract":"Biodiesel is produced from oils esterified with alcohol into glycerol and water. Vegetable edible oil raw materials are the main consideration in biodiesel production. This study used three types of oil, namely palm oil (PO), waste frying oil (WFO), soybean oil (SO), and corn oil (CO), with the catalyst of the enzyme lipase. The price of WFO as raw materials is low, although it must be controlled acid and water levels. In the research run, the oil mixture consists of two types of oils mixed with a certain composition and the addition of certain lipase enzymes. The research resulted that the yield produced by multi-feedstock biodiesel with free fatty acid (FFA) < 2 was 89.7%, 89.03%, and 86.11% higher than the sample with FFA > 2 at 79.54%, 74.66%, and 73.33%, respectively. The minimum density produced is a mixture of WFO with CO of 861.1 kg/m3. The largest viscosity produced is a mixture of WFO with SO of 18.03 mm2/s. Mixing raw materials can lower the number of iodine multi-feedstock biodiesel. The number of acids produced by multi-feedstock biodiesel exceeds ASTM standards. The total glycerol produced by multi-feedstock biodiesel varies, whereby a multi-feedstock blend of PO can lower total glycerol. In contrast, a multi-feedstock blend of WFO tends to produce high total glycerol.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45033365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Syed muhammad Shahid Hussain, S. N. Hussain, H. Asghar, H. Sattar
Treatment methods for water-containing organics are gaining significant attraction in modern-day research. Amines are an important organic compound class encountered in industrial wastewater streams. The current research paper focuses on studying the adsorption behavior of aniline and parachloro-aniline using a graphite-based adsorbent, namely, Nyex-1000, and the subsequent regeneration of the adsorbent. To determine Nyex-1000's adsorption capacity, several parameters, including time, pH, and concentration, were assessed. Adsorption isotherms, kinetics, and used adsorbent regeneration were also investigated. The adsorption of aniline and parachloro-aniline was found to be quite rapid owing to its non-porous nature. Moreover, the low energy requirement makes the process quite economical due to the high electrical conductivity of the adsorbent. The adsorption data was fitted to Langmuir, Freundlich, Redlich Peterson, Sips, and Toth isotherm models. In aniline’s case, Langmuir and Parachloro-aniline Sips models gave the best fitting with the highest R2 value. A regeneration efficiency of 100% was observed in case of both aniline and parachloro-aniline by passing a charge of 5 and 10 coulombs per gram through the adsorbent bed 10 mm in thickness. Adsorption for parachloro-aniline was found to be 0.88 mg/g, and for aniline was found to be 0.40 mg/g. The reduction in adsorption capacity was minimal after several adsorption and regeneration cycles. This study found that spent adsorbent could be regenerated effectively through electrochemical regeneration.
{"title":"Degradation of Aniline & Para- Chloroaniline from Water by Adsorption Coupled with Electrochemical Regeneration","authors":"Syed muhammad Shahid Hussain, S. N. Hussain, H. Asghar, H. Sattar","doi":"10.22146/ajche.85055","DOIUrl":"https://doi.org/10.22146/ajche.85055","url":null,"abstract":"Treatment methods for water-containing organics are gaining significant attraction in modern-day research. Amines are an important organic compound class encountered in industrial wastewater streams. The current research paper focuses on studying the adsorption behavior of aniline and parachloro-aniline using a graphite-based adsorbent, namely, Nyex-1000, and the subsequent regeneration of the adsorbent. To determine Nyex-1000's adsorption capacity, several parameters, including time, pH, and concentration, were assessed. Adsorption isotherms, kinetics, and used adsorbent regeneration were also investigated. The adsorption of aniline and parachloro-aniline was found to be quite rapid owing to its non-porous nature. Moreover, the low energy requirement makes the process quite economical due to the high electrical conductivity of the adsorbent. The adsorption data was fitted to Langmuir, Freundlich, Redlich Peterson, Sips, and Toth isotherm models. In aniline’s case, Langmuir and Parachloro-aniline Sips models gave the best fitting with the highest R2 value. A regeneration efficiency of 100% was observed in case of both aniline and parachloro-aniline by passing a charge of 5 and 10 coulombs per gram through the adsorbent bed 10 mm in thickness. Adsorption for parachloro-aniline was found to be 0.88 mg/g, and for aniline was found to be 0.40 mg/g. The reduction in adsorption capacity was minimal after several adsorption and regeneration cycles. This study found that spent adsorbent could be regenerated effectively through electrochemical regeneration.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49592496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study aims to extract oil from Java lemongrass (Cymbopogon citratus) using the pilot-scale Microwave-Assisted Hydro distillation method (distiller volume 10,000 mL). The operating variables of this research are the extraction time, the microwave power, and the ratio of the mass of the material to the solvent (F/S ratio). The results showed an increase in the yield of lemongrass oil along with the increase in extraction time using the Microwave-Assisted Hydro distillation (MAHD) method, and this trend will continue to occur as microwave heating is selective and volumetric. Thus, there is a tendency to increase yield with increasing power. In general, it follows that the higher the power, the higher the yield. The energy received by the material to be converted into heat has caused the essential oil yield to be more abundant, with the highest yield being obtained at 800 W. The increase in the material to solvent ratio increased the oil yield up to a certain point. However, the yield started declining after the F/S ratio of 0.08 was reached. The first order kinetic model well represents the extraction process at a pilot scale. The pilot scale's oil yield is slightly lower than the laboratory scale MAHD. Compositional analysis of the result suggests that the main components of Java lemongrass oil are Geranial (30.06%), Z-Citral (25.88%), Eugenol (12.88%), and Beta-Myrcene (12.84%).
{"title":"Extraction of Java Lemongrass (Cymbopogon citratus) Using Microwave-Assisted Hydro Distillation in Pilot Scale: Parametric Study and Modelling","authors":"Y. Variyana, Z. Ma’sum, D. Bhuana, M. Mahfud","doi":"10.22146/ajche.79220","DOIUrl":"https://doi.org/10.22146/ajche.79220","url":null,"abstract":"This study aims to extract oil from Java lemongrass (Cymbopogon citratus) using the pilot-scale Microwave-Assisted Hydro distillation method (distiller volume 10,000 mL). The operating variables of this research are the extraction time, the microwave power, and the ratio of the mass of the material to the solvent (F/S ratio). The results showed an increase in the yield of lemongrass oil along with the increase in extraction time using the Microwave-Assisted Hydro distillation (MAHD) method, and this trend will continue to occur as microwave heating is selective and volumetric. Thus, there is a tendency to increase yield with increasing power. In general, it follows that the higher the power, the higher the yield. The energy received by the material to be converted into heat has caused the essential oil yield to be more abundant, with the highest yield being obtained at 800 W. The increase in the material to solvent ratio increased the oil yield up to a certain point. However, the yield started declining after the F/S ratio of 0.08 was reached. The first order kinetic model well represents the extraction process at a pilot scale. The pilot scale's oil yield is slightly lower than the laboratory scale MAHD. Compositional analysis of the result suggests that the main components of Java lemongrass oil are Geranial (30.06%), Z-Citral (25.88%), Eugenol (12.88%), and Beta-Myrcene (12.84%).","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43765175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mc Lein Roger M. Lubiano II, Cris Vincent L. Manacup, A. Soriano, R. V. Rubi
The health risks impact of heavy metal contamination in the environment has prompted researchers to study its mitigation in an efficient and cost-friendly approach. Recently, simulated continuous biosorption using agricultural wastes is gaining popularity because it offers cheaper and faster alternative study methods using efficient large-scale removal of lead, which is known to cause adverse effects even at low concentrations. Bamboo shoots (Bambusa spp.), a delicacy known in Southeast Asia, are recognized worldwide, but the inedible sheath husks are thrown. This study evaluated the continuous Pb2+ biosorption performance of Bambusa spp. using Aspen Adsorption V8.4 by varying bed height, influent concentration, and volumetric flow rate. Linear driving force model was used to simplify, according to a separate batch biosorption study, ion exchange mechanism and Langmuir isotherm for equilibrium conditions. The backward differencing method was used to solve the resulting differential equation. Results showed that increasing the volumetric flowrate from 4.00x10-5 to 8.00x10-5 m3/s, the bed height from 0.2 to 1.0 m, and influent concentration from 80 to 120 ppm resulted in changes in the breakthrough time by a factor of 0,5, 4.0, and 0.67 respectively. Analysis of the breakthrough curves showed that increasing volumetric flow rate shortens breakthrough time due to reduced contact time, and increasing Pb2+ concentration facilitated ion exchange by increasing concentration difference. Bed height provides more binding sites available hence, higher Pb2+ removal.
{"title":"Continuous Biosorption of Pb2+ with Bamboo Shoots (Bambusa spp.) using Aspen Adsorption® Process Simulation Software","authors":"Mc Lein Roger M. Lubiano II, Cris Vincent L. Manacup, A. Soriano, R. V. Rubi","doi":"10.22146/ajche.77314","DOIUrl":"https://doi.org/10.22146/ajche.77314","url":null,"abstract":"The health risks impact of heavy metal contamination in the environment has prompted researchers to study its mitigation in an efficient and cost-friendly approach. Recently, simulated continuous biosorption using agricultural wastes is gaining popularity because it offers cheaper and faster alternative study methods using efficient large-scale removal of lead, which is known to cause adverse effects even at low concentrations. Bamboo shoots (Bambusa spp.), a delicacy known in Southeast Asia, are recognized worldwide, but the inedible sheath husks are thrown. This study evaluated the continuous Pb2+ biosorption performance of Bambusa spp. using Aspen Adsorption V8.4 by varying bed height, influent concentration, and volumetric flow rate. Linear driving force model was used to simplify, according to a separate batch biosorption study, ion exchange mechanism and Langmuir isotherm for equilibrium conditions. The backward differencing method was used to solve the resulting differential equation. Results showed that increasing the volumetric flowrate from 4.00x10-5 to 8.00x10-5 m3/s, the bed height from 0.2 to 1.0 m, and influent concentration from 80 to 120 ppm resulted in changes in the breakthrough time by a factor of 0,5, 4.0, and 0.67 respectively. Analysis of the breakthrough curves showed that increasing volumetric flow rate shortens breakthrough time due to reduced contact time, and increasing Pb2+ concentration facilitated ion exchange by increasing concentration difference. Bed height provides more binding sites available hence, higher Pb2+ removal.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48407473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sri Mulyati, C. Rosnelly, Y. Syamsuddin, N. Arahman, S. Muchtar, Wahyuni Wahyuni, T. Lauzia, A. Ambarita, M. Bilad, S. Samsuri
One of the common techniques for treating water and water from waste effluent is membrane filtration. Polymer is the main material that is most extensively employed as a substance for membranes. Because of its outstanding strength and resistance to chemicals, Polyethersulfone, also known as PES, is a common polymer used in the production of membranes. Unfortunately, its hydrophobicity makes it easy to foul when applied to water treatment processes. This study introduced a chitosan additive isolated from golden snail shell waste as an additive for PES-based membrane fabrication via blending at 0 wt%, 1 wt%, 3 wt%, 5 wt%, and 7 wt%. After preparation, the resultant membranes were analyzed and tested for their ability to filter a humic acid solution at a concentration of 50 mg L-1. According to the findings, the chitosan additive has the potential to change the characteristics of the membrane as well as its filtration performance. It increased the pure water flux from 110 181 L m-2 h-1 (no chitosan loading) to 181 L m-2 h-1 (for five wt% loadings). The membrane characterization results supported this increase in pure water flux, which showed that adding chitosan additives improved the porosity, size of pores, and hydrophilicity. The addition of this additive also has a good effect on the anti-fouling property by increasing the fouling recovery ratio (FRR). The FRRs for the modified membranes were 79% to 82%, which were higher than the neat PES membrane with an FRR of merely 60%.
膜过滤是处理水和废水的常用技术之一。聚合物是最广泛使用的主要材料，作为膜的物质。聚醚砜，也被称为PES，由于其卓越的强度和耐化学品性，是一种用于生产膜的常用聚合物。不幸的是，它的疏水性使它在应用于水处理过程时容易发霉。本研究介绍了从金螺壳中分离得到的壳聚糖添加剂，通过0 wt%、1 wt%、3 wt%、5 wt%、7 wt%的共混制备聚醚基膜。制备后，对所得膜进行了分析和测试，以确定其过滤浓度为50 mg L-1的腐植酸溶液的能力。研究结果表明，壳聚糖添加剂有可能改变膜的特性和过滤性能。它使纯水通量从110 181 L m-2 h-1(无壳聚糖负载)增加到181 L m-2 h-1 (5 wt%负载)。膜表征结果支持纯水通量的增加，表明添加壳聚糖改善了孔隙度、孔隙大小和亲水性。该添加剂的加入还通过提高污垢回收率(FRR)对防污性能产生了良好的影响。改性膜的FRR为79% ~ 82%，高于纯PES膜的60%。
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There has been a considerable in converting palm oil to green diesel. Green diesel is a hydrocarbon compound similar to conventional diesel fuel's components. It is expected to substitute conventional diesel fuel in diesel vehicle engines. The process of producing diesel is also called the deoxygenation process. One of the deoxygenation processes is decarboxylation. The current study evaluates the performance of Ni-CaO/AC catalyst in the form of pellets by mixing a powder Ni-CaO/AC catalyst and phenolic resin. The aim of this study namely to evaluate the performance pellets of Ni-CaO/AC catalyst in the decarboxylation of palm oil under sub-critical water. This research includes catalyst activity carried out by decarboxylation in subcritical water with temperature variations: 300, 310, 320, and 330 °C using pellets of Ni-CaO/AC catalyst. The decarboxylation products obtained were analyzed with Gas Chromatography-Mass Spectroscopy (GC-MS). The results obtained in this study showed that the highest percentage composition and selectivity of green diesel were obtained at a temperature of 330 °C, with values of 18.08 and 22.07, respectively. These results suggest that higher temperature promotes the hydrogenation-decarboxylation reaction of palm oil. Pellets of Ni-CaO/AC catalyst can increase the selectivity of green diesel if the phenolic resin is replaced with a binder that can provide physical strength to the catalyst but does not damage the function and cover much of the active surface area of the catalyst. We can conclude that pellets of Ni-CaO/AC catalysts have the potential to do hydrothermal decarboxylation if the increased operating condition.
在将棕榈油转化为绿色柴油方面已经取得了相当大的进展。绿色柴油是一种碳氢化合物，类似于传统柴油的成分。它有望取代柴油汽车发动机中的传统柴油燃料。生产柴油的过程也称为脱氧过程。脱氧过程之一是脱羧。本研究通过将粉末Ni-CaO/AC催化剂与酚醛树脂混合，以颗粒形式评价Ni-CaO/AC催化剂的性能。本研究的目的是评价镍- cao /AC催化剂颗粒在亚临界水条件下棕榈油脱羧的性能。本研究包括在温度变化为300、310、320和330°C的亚临界水中进行脱羧的催化剂活性，使用Ni-CaO/AC催化剂颗粒。得到的脱羧产物用气相色谱-质谱(GC-MS)分析。本研究结果表明，在温度为330℃时，绿色柴油的百分比组成和选择性最高，分别为18.08和22.07。这些结果表明，较高的温度促进了棕榈油的氢化-脱羧反应。如果用粘合剂代替酚醛树脂，可以为催化剂提供物理强度，但不破坏催化剂的功能并覆盖催化剂的大部分活性表面积，则Ni-CaO/AC催化剂颗粒可以提高绿色柴油的选择性。我们可以得出结论，如果提高操作条件，Ni-CaO/AC催化剂球团具有水热脱羧的潜力。
{"title":"Catalytic Decarboxylation of Palm Oil to Green Diesel over Pellets of Ni-CaO/Activated Carbon (AC) Catalyst Under Subcritical Water","authors":"D. Septriana, M. M. Azis, J. Wintoko","doi":"10.22146/ajche.70878","DOIUrl":"https://doi.org/10.22146/ajche.70878","url":null,"abstract":"There has been a considerable in converting palm oil to green diesel. Green diesel is a hydrocarbon compound similar to conventional diesel fuel's components. It is expected to substitute conventional diesel fuel in diesel vehicle engines. The process of producing diesel is also called the deoxygenation process. One of the deoxygenation processes is decarboxylation. The current study evaluates the performance of Ni-CaO/AC catalyst in the form of pellets by mixing a powder Ni-CaO/AC catalyst and phenolic resin. The aim of this study namely to evaluate the performance pellets of Ni-CaO/AC catalyst in the decarboxylation of palm oil under sub-critical water. This research includes catalyst activity carried out by decarboxylation in subcritical water with temperature variations: 300, 310, 320, and 330 °C using pellets of Ni-CaO/AC catalyst. The decarboxylation products obtained were analyzed with Gas Chromatography-Mass Spectroscopy (GC-MS). The results obtained in this study showed that the highest percentage composition and selectivity of green diesel were obtained at a temperature of 330 °C, with values of 18.08 and 22.07, respectively. These results suggest that higher temperature promotes the hydrogenation-decarboxylation reaction of palm oil. Pellets of Ni-CaO/AC catalyst can increase the selectivity of green diesel if the phenolic resin is replaced with a binder that can provide physical strength to the catalyst but does not damage the function and cover much of the active surface area of the catalyst. We can conclude that pellets of Ni-CaO/AC catalysts have the potential to do hydrothermal decarboxylation if the increased operating condition.","PeriodicalId":8490,"journal":{"name":"ASEAN Journal of Chemical Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44368509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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