Pub Date : 2023-08-12DOI: 10.1080/00986445.2023.2223126
O. Khlopyk, S. Korniy, I. Zin, M. Holovchuk
Abstract It was evaluated the potential of using crude glycerol, a by-product of biodiesel production from vegetable oil, as a «green» corrosion inhibitor for aluminum alloys in the neutral chloride-containing medium. It was found that it has inhibitory properties and efficiently protects aluminum alloys from corrosion in 0.1% NaCl solution; the degree of protection was up to 79%. The protective action of crude glycerol increases with increasing its concentration to 2.5 g/l. Impedance modulus of aluminum alloy increases in inhibited corrosion solution. The mechanism of corrosion inhibition is the physical and partially chemical adsorption of molecules of crude glycerol components, and probably the formation of copper-glycerol complexes on the metal surface. The adsorption of the studied inhibitor is described by the Frumkin isotherm. Energy dispersive x-ray analysis confirmed the formation of an organic protective layer on the metal surface.
{"title":"Corrosion inhibition of aluminium alloy in NaCl solution by glycerol from biodiesel production","authors":"O. Khlopyk, S. Korniy, I. Zin, M. Holovchuk","doi":"10.1080/00986445.2023.2223126","DOIUrl":"https://doi.org/10.1080/00986445.2023.2223126","url":null,"abstract":"Abstract It was evaluated the potential of using crude glycerol, a by-product of biodiesel production from vegetable oil, as a «green» corrosion inhibitor for aluminum alloys in the neutral chloride-containing medium. It was found that it has inhibitory properties and efficiently protects aluminum alloys from corrosion in 0.1% NaCl solution; the degree of protection was up to 79%. The protective action of crude glycerol increases with increasing its concentration to 2.5 g/l. Impedance modulus of aluminum alloy increases in inhibited corrosion solution. The mechanism of corrosion inhibition is the physical and partially chemical adsorption of molecules of crude glycerol components, and probably the formation of copper-glycerol complexes on the metal surface. The adsorption of the studied inhibitor is described by the Frumkin isotherm. Energy dispersive x-ray analysis confirmed the formation of an organic protective layer on the metal surface.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44525805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-12DOI: 10.1080/00986445.2023.2240726
E. Ali, A. Najib, J. Orfi, F. Almehmadi
{"title":"Improved model structure of direct contact membrane distillation for saline water purification","authors":"E. Ali, A. Najib, J. Orfi, F. Almehmadi","doi":"10.1080/00986445.2023.2240726","DOIUrl":"https://doi.org/10.1080/00986445.2023.2240726","url":null,"abstract":"","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41963253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-07DOI: 10.1080/00986445.2023.2240712
Deepanshu Awasthi, S. K. Guchhait, Suman, A. K. Sarma, B. Bajaj
Abstract In this study, we reported the preparation of Quintinite-3T (Q-3T) and its use as a productive efficient/effective heterogeneous catalyst for the production of biodiesel. Quintinite-3T (Q-3T) has been successfully synthesized via the co-precipitation method. Physico-chemical properties of the synthesized catalyst were studied using powder X-Ray diffraction (XRD), High-resolution transmission electron microscopy (HR-TEM), BET analysis, and Thermogravimetric analysis (TGA). Q-3T exhibited promising utility as a heterogeneous catalyst to transesterify Jatropha curcas oil (JCO) and used cooking oil (UCO) to fatty acid methyl ester (FAME). Q-3T catalyst was used with KOH, a co-catalyst to verify its effect on biodiesel production. The effective parameters of the transesterification yield involving reaction time, reaction temperature, and the oil-to-alcohol molar ratio was studied. The maximum yield of 82% for biodiesel was reached at ideal conditions, which include a moderate catalyst concentration (2% (w/w) in the ratio 1.2:0.8 (KOH: Q-3T), at a low temperature and relatively short reaction time of 60° C and 1 h, respectively. Additionally, it is found that the biodiesel’s properties are in good conformity with ASTM D6571 fuel specifications. It is pertinent that the use of Q-3T nanocatalyst as a heterogeneous catalyst for biodiesel production from Jatropha curcas oil and used cooking oil could be beneficial.
{"title":"Synthesis and application of Quintinite-3T nano catalyst along with KOH for biodiesel production from Jatropha curcas oil and used cooking oil","authors":"Deepanshu Awasthi, S. K. Guchhait, Suman, A. K. Sarma, B. Bajaj","doi":"10.1080/00986445.2023.2240712","DOIUrl":"https://doi.org/10.1080/00986445.2023.2240712","url":null,"abstract":"Abstract In this study, we reported the preparation of Quintinite-3T (Q-3T) and its use as a productive efficient/effective heterogeneous catalyst for the production of biodiesel. Quintinite-3T (Q-3T) has been successfully synthesized via the co-precipitation method. Physico-chemical properties of the synthesized catalyst were studied using powder X-Ray diffraction (XRD), High-resolution transmission electron microscopy (HR-TEM), BET analysis, and Thermogravimetric analysis (TGA). Q-3T exhibited promising utility as a heterogeneous catalyst to transesterify Jatropha curcas oil (JCO) and used cooking oil (UCO) to fatty acid methyl ester (FAME). Q-3T catalyst was used with KOH, a co-catalyst to verify its effect on biodiesel production. The effective parameters of the transesterification yield involving reaction time, reaction temperature, and the oil-to-alcohol molar ratio was studied. The maximum yield of 82% for biodiesel was reached at ideal conditions, which include a moderate catalyst concentration (2% (w/w) in the ratio 1.2:0.8 (KOH: Q-3T), at a low temperature and relatively short reaction time of 60° C and 1 h, respectively. Additionally, it is found that the biodiesel’s properties are in good conformity with ASTM D6571 fuel specifications. It is pertinent that the use of Q-3T nanocatalyst as a heterogeneous catalyst for biodiesel production from Jatropha curcas oil and used cooking oil could be beneficial.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42997942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-03DOI: 10.1080/00986445.2022.2065269
Md. Murshadul Hoque, Shamim Mahbub, M. T. R. Joy, M. A. Rub, Shahed Rana, Dileep Kumar, Y. Alghamdi, Abdullah M. Asiri, M. A. Khan
Abstract The micellization of cetyltrimethylammonium bromide (CTAB) and bovine serum albumin (BSA) mixture has been studied conductometrically in aq. solutions of different diols (1,2-propanediol (1,2-PrD), 2,3-butanediol (2,3-BD), and 1,5-pentanediol (1,5-PD)) media over the temperature range from 298.15 K to 323.15 K to gain insight into the mode and degree of interaction amongst the investigated constituents. The critical micelle concentration (cmc) values of the CTAB + BSA mixtures were attained initially low but enhanced with the rise in temperature in all the media studied. The values of the CTAB + BSA mixtures in the different diols media followed the order: The degree of micelle ionization (α) increased with increasing carbon chain length of diols and temperature. The Gibbs free energy ( ) values associated with the micellization of the CTAB + BSA mixture were negative and revealed a lowering of the spontaneity of micellization with increasing carbon chain length of the diols. The enthalpy ( ) and entropy ( ) changes of micellization revealed that the micellization was exothermic and mainly an enthalpy-controlled process in aq.1,2-PrD and 2,3-BD media while the process being endothermic, and entropy controlled in the 1,5-PD medium. The contribution of the solvent to the thermodynamic parameters was assessed from free energy of transfer ( ), enthalpy of transfer ( ), and entropy of transfer ( ) values. The enthalpy–entropy compensation parameters were also studied and discussed with proper reasoning.
{"title":"Modes of interaction and thermodynamic behavior of aggregation of CTAB + BSA mixtures in diols media: effects of diols composition and temperature","authors":"Md. Murshadul Hoque, Shamim Mahbub, M. T. R. Joy, M. A. Rub, Shahed Rana, Dileep Kumar, Y. Alghamdi, Abdullah M. Asiri, M. A. Khan","doi":"10.1080/00986445.2022.2065269","DOIUrl":"https://doi.org/10.1080/00986445.2022.2065269","url":null,"abstract":"Abstract The micellization of cetyltrimethylammonium bromide (CTAB) and bovine serum albumin (BSA) mixture has been studied conductometrically in aq. solutions of different diols (1,2-propanediol (1,2-PrD), 2,3-butanediol (2,3-BD), and 1,5-pentanediol (1,5-PD)) media over the temperature range from 298.15 K to 323.15 K to gain insight into the mode and degree of interaction amongst the investigated constituents. The critical micelle concentration (cmc) values of the CTAB + BSA mixtures were attained initially low but enhanced with the rise in temperature in all the media studied. The values of the CTAB + BSA mixtures in the different diols media followed the order: The degree of micelle ionization (α) increased with increasing carbon chain length of diols and temperature. The Gibbs free energy ( ) values associated with the micellization of the CTAB + BSA mixture were negative and revealed a lowering of the spontaneity of micellization with increasing carbon chain length of the diols. The enthalpy ( ) and entropy ( ) changes of micellization revealed that the micellization was exothermic and mainly an enthalpy-controlled process in aq.1,2-PrD and 2,3-BD media while the process being endothermic, and entropy controlled in the 1,5-PD medium. The contribution of the solvent to the thermodynamic parameters was assessed from free energy of transfer ( ), enthalpy of transfer ( ), and entropy of transfer ( ) values. The enthalpy–entropy compensation parameters were also studied and discussed with proper reasoning.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":"210 1","pages":"1235 - 1246"},"PeriodicalIF":2.5,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42781173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Synthesis of ethanol by CO2 hydrogenation presents an efficient way to convert CO2 into value-added fuels and chemicals. For practical applications, recycling unreacted tail gas as well as CO co-feeding plays a key role to enhance CO2 conversion to ethanol. Thus, it is of great significance to study the effects of recycling unreacted tail gas and CO co-feeding on the chemical equilibrium. Herein, we perform a thermodynamic study to analyze the hydrogenation of CO2 to ethanol using Aspen Plus. The effects of recycling tail gas and CO co-feeding on CO2 conversion and ethanol selectivity at different temperatures and pressures are investigated. Both the optimal recycle ratio and CO/(CO + CO2) ratio in the feed are found to enhance ethanol synthesis from CO2 hydrogenation.
{"title":"Thermodynamic analysis of ethanol synthesis by CO2 hydrogenation using Aspen Plus: effects of tail gas recycling and CO co-feeding","authors":"Yiming He, Weijie Fu, Zhenchen Tang, Shuilian Liu, Jian Chen, Qitong Zhong, Xing Tan, Ruiyan Sun, C. Mebrahtu, Feng Zeng","doi":"10.1080/00986445.2023.2240709","DOIUrl":"https://doi.org/10.1080/00986445.2023.2240709","url":null,"abstract":"Abstract Synthesis of ethanol by CO2 hydrogenation presents an efficient way to convert CO2 into value-added fuels and chemicals. For practical applications, recycling unreacted tail gas as well as CO co-feeding plays a key role to enhance CO2 conversion to ethanol. Thus, it is of great significance to study the effects of recycling unreacted tail gas and CO co-feeding on the chemical equilibrium. Herein, we perform a thermodynamic study to analyze the hydrogenation of CO2 to ethanol using Aspen Plus. The effects of recycling tail gas and CO co-feeding on CO2 conversion and ethanol selectivity at different temperatures and pressures are investigated. Both the optimal recycle ratio and CO/(CO + CO2) ratio in the feed are found to enhance ethanol synthesis from CO2 hydrogenation.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49005766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-03DOI: 10.1080/00986445.2022.2084392
John A. Thomas, Anisur Rahman, J. Wutz, Ying Wang, Brian Devincentis, Brendan McGuire, Lei Cao
Abstract A physics-based approach for modeling convective gas-liquid mass transfer across free surfaces in lab-scale agitated vessels is presented. This approach, which combines numerical modeling with semi-empirical turbulence theory, is validated across multiple operating scales and conditions. The findings show that, regardless of the mechanical action driving motion, free surface mass transfer rate in lab-scale systems is consistent with empirical relationships. The role and importance of free surface convective mass transfer in lab scale devices is also discussed. The computational approach is shown to be practical within the context of industrial analysis and design timescales.
{"title":"Modeling free surface gas transfer in agitated lab-scale bioreactors","authors":"John A. Thomas, Anisur Rahman, J. Wutz, Ying Wang, Brian Devincentis, Brendan McGuire, Lei Cao","doi":"10.1080/00986445.2022.2084392","DOIUrl":"https://doi.org/10.1080/00986445.2022.2084392","url":null,"abstract":"Abstract A physics-based approach for modeling convective gas-liquid mass transfer across free surfaces in lab-scale agitated vessels is presented. This approach, which combines numerical modeling with semi-empirical turbulence theory, is validated across multiple operating scales and conditions. The findings show that, regardless of the mechanical action driving motion, free surface mass transfer rate in lab-scale systems is consistent with empirical relationships. The role and importance of free surface convective mass transfer in lab scale devices is also discussed. The computational approach is shown to be practical within the context of industrial analysis and design timescales.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":"210 1","pages":"1328 - 1339"},"PeriodicalIF":2.5,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44476748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-27DOI: 10.1080/00986445.2023.2237901
S. Jena, S. Mohapatra, B. Mohanty, Ambika Prasad Nayak, Suprabha Palatasingh
Abstract The increasing global demand for potassic fertilizer, due to the population growth, indirectly forces many countries to search for an alternative source of potassium. The present study reports the recovery of potassium from K-feldspar (K2O 12.5 wt. %) through the chlorination roasting—water leaching process applying a mixture of CaCl2 and NaCl. Individual use of NaCl and CaCl2 results in the extraction of ∼50% and 92% of potassium, respectively. Though the K-extraction is very high via CaCl2 roasting process, it adds an extra cost to the process as compared with NaCl. However, the use of salt mixture CaCl2: NaCl (40:60 wt. %) recovers potassium to the tune of ∼98% at optimum conditions (850 °C, 60 min roasting period, salt mixture: feldspar 1:1). Various experimental parameters such as temperature, time, and salt to feldspar ratio were optimized to recover maximum potassium from the complex structure of K-feldspar. The experimental results are explained using a theoretical extraction model, further supported by characterizations of the samples using XRD, SEM-EDX and FTIR studies. NOVELTY STATEMENTS Potassium extracted from K-feldspar applying a mixture of CaCl2 and NaCl. The chlorination-roasting temperature (using salt mixture) was lesser (by 50 °C) as compared with the use of individual salts. The extraction process (using salt mixture) was less expensive as compared with the use of independent salts. The K-extraction mechanism has been discussed considering the experimental results. Characterization studies support the proposed extraction mechanism.
{"title":"Thermal treatment of K-feldspar for potassium recovery using NaCl–CaCl2 mixture and its mechanism study","authors":"S. Jena, S. Mohapatra, B. Mohanty, Ambika Prasad Nayak, Suprabha Palatasingh","doi":"10.1080/00986445.2023.2237901","DOIUrl":"https://doi.org/10.1080/00986445.2023.2237901","url":null,"abstract":"Abstract The increasing global demand for potassic fertilizer, due to the population growth, indirectly forces many countries to search for an alternative source of potassium. The present study reports the recovery of potassium from K-feldspar (K2O 12.5 wt. %) through the chlorination roasting—water leaching process applying a mixture of CaCl2 and NaCl. Individual use of NaCl and CaCl2 results in the extraction of ∼50% and 92% of potassium, respectively. Though the K-extraction is very high via CaCl2 roasting process, it adds an extra cost to the process as compared with NaCl. However, the use of salt mixture CaCl2: NaCl (40:60 wt. %) recovers potassium to the tune of ∼98% at optimum conditions (850 °C, 60 min roasting period, salt mixture: feldspar 1:1). Various experimental parameters such as temperature, time, and salt to feldspar ratio were optimized to recover maximum potassium from the complex structure of K-feldspar. The experimental results are explained using a theoretical extraction model, further supported by characterizations of the samples using XRD, SEM-EDX and FTIR studies. NOVELTY STATEMENTS Potassium extracted from K-feldspar applying a mixture of CaCl2 and NaCl. The chlorination-roasting temperature (using salt mixture) was lesser (by 50 °C) as compared with the use of individual salts. The extraction process (using salt mixture) was less expensive as compared with the use of independent salts. The K-extraction mechanism has been discussed considering the experimental results. Characterization studies support the proposed extraction mechanism.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42989605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-18DOI: 10.1080/00986445.2023.2233002
Ramasamy Venkidasamy, Thenpandiyan Elumalai, S. Govindhasamy, Sathishpriya Tharmalingam, James Jebaseelan Samuel Emmanuel Rajan
Abstract Nano CaCO3 (nC), various polymer mediated nano CaCO3 and Eu3+ anchored nano CaCO3/PEG were synthesized from natural carbonate source (Dolomite) (CaMg(CO3)2) using a novel, low cost, non-toxic and effective route biomimetic synthesis. The mineralogy, structural, thermal stability, and morphology analysis of the products were assessed through FTIR, XRD, TG-DTA, FE-SEM with EDX mapping, and HR-TEM with SAED. Results show that the prepared samples were in the form of calcite with rhombohedral (25-36 nm) structure. The prepared products exhibit good thermal stability up to 844° C. The products show a spherical and porous like structure. The elemental compositions of the products were confirmed through EDX analysis. All the plane values (observed from SAED) were matched with XRD results. An increase of Eu3+ in CaCO3 shows that the absorption and emission peaks are blue shifted and the band gap values are red shifted. The measured photoluminescence quantum yield values of 0.02 Eu3+:CaCO3/PEG (nCE1) and 0.08 Eu3+: CaCO3/PEG (nCE4) are 21% and 19%, respectively. Finally, the products (nC, nCE1, and nCE4) were subjected to photodegradation application and results shows that nCE1 has good photocatalytic activity against methylene blue (87%) for 90 min.
{"title":"Synthesis of CaCO3 nanocomposite from natural carbonate source and its effect on the inclusion of Eu3+ ions for photocatalytic activity","authors":"Ramasamy Venkidasamy, Thenpandiyan Elumalai, S. Govindhasamy, Sathishpriya Tharmalingam, James Jebaseelan Samuel Emmanuel Rajan","doi":"10.1080/00986445.2023.2233002","DOIUrl":"https://doi.org/10.1080/00986445.2023.2233002","url":null,"abstract":"Abstract Nano CaCO3 (nC), various polymer mediated nano CaCO3 and Eu3+ anchored nano CaCO3/PEG were synthesized from natural carbonate source (Dolomite) (CaMg(CO3)2) using a novel, low cost, non-toxic and effective route biomimetic synthesis. The mineralogy, structural, thermal stability, and morphology analysis of the products were assessed through FTIR, XRD, TG-DTA, FE-SEM with EDX mapping, and HR-TEM with SAED. Results show that the prepared samples were in the form of calcite with rhombohedral (25-36 nm) structure. The prepared products exhibit good thermal stability up to 844° C. The products show a spherical and porous like structure. The elemental compositions of the products were confirmed through EDX analysis. All the plane values (observed from SAED) were matched with XRD results. An increase of Eu3+ in CaCO3 shows that the absorption and emission peaks are blue shifted and the band gap values are red shifted. The measured photoluminescence quantum yield values of 0.02 Eu3+:CaCO3/PEG (nCE1) and 0.08 Eu3+: CaCO3/PEG (nCE4) are 21% and 19%, respectively. Finally, the products (nC, nCE1, and nCE4) were subjected to photodegradation application and results shows that nCE1 has good photocatalytic activity against methylene blue (87%) for 90 min.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47212195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-12DOI: 10.1080/00986445.2023.2230561
Namrata Upreti, Shaurya Mohan, Prakash D. Vaidya
Abstract The CO2-capturing performance of a sterically hindered amine, 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD), was systematically studied in this work. First, absorption kinetics was investigated using the stirred-cell technique. At T = 308 K, CO2 reacted with AHPD according to a second-order reaction (rate constant = 264 m3/kmol-s), whose activation energy was 33 kJ/mol. Second, the solubility of CO2 in AHPD at 308 K was measured up to 100 kPa CO2 partial pressure. For instance, it was shown that the loading capacity of AHPD (2.5 M) was 0.56 mol/mol, while the equilibrium CO2 partial pressure was 79 kPa. Third, a closed-loop absorber-desorber setup was used to test solvent performance for capturing CO2 from CO2/air mixture (12:88 v/v). The two columns were continuously operated at 313 (absorber) and 383 K (desorber) at 0.1 MPa pressure. Around 75% CO2 was absorbed using 12 wt. % AHPD (or 0.9 M). The value of QReg (regeneration energy) was 6.28 MJ/kg CO2. It was thus evident that AHPD is a credible hindered amine-based solvent. A comparison of its equilibrium, kinetic and regeneration features with 2-amino-2-methyl-1-propanol (AMP) was provided. Finally, three rate promoters–hexamethylene diamine (HMDA), monoethanolamine (MEA) and AMP–were added to AHPD. The performance of HMDA was most promising. In a batch desorption setup, it was shown that alumina catalyst improved desorption of CO2 from loaded AHPD/HMDA mixtures. This work will stimulate further interest in the use of AHPD solutions for CO2 removal.
{"title":"2-Amino-2-hydroxymethyl-1,3-propanediol for CO2 capture: study on equilibrium, absorption kinetics, catalytic desorption, and amine regeneration","authors":"Namrata Upreti, Shaurya Mohan, Prakash D. Vaidya","doi":"10.1080/00986445.2023.2230561","DOIUrl":"https://doi.org/10.1080/00986445.2023.2230561","url":null,"abstract":"Abstract The CO2-capturing performance of a sterically hindered amine, 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD), was systematically studied in this work. First, absorption kinetics was investigated using the stirred-cell technique. At T = 308 K, CO2 reacted with AHPD according to a second-order reaction (rate constant = 264 m3/kmol-s), whose activation energy was 33 kJ/mol. Second, the solubility of CO2 in AHPD at 308 K was measured up to 100 kPa CO2 partial pressure. For instance, it was shown that the loading capacity of AHPD (2.5 M) was 0.56 mol/mol, while the equilibrium CO2 partial pressure was 79 kPa. Third, a closed-loop absorber-desorber setup was used to test solvent performance for capturing CO2 from CO2/air mixture (12:88 v/v). The two columns were continuously operated at 313 (absorber) and 383 K (desorber) at 0.1 MPa pressure. Around 75% CO2 was absorbed using 12 wt. % AHPD (or 0.9 M). The value of QReg (regeneration energy) was 6.28 MJ/kg CO2. It was thus evident that AHPD is a credible hindered amine-based solvent. A comparison of its equilibrium, kinetic and regeneration features with 2-amino-2-methyl-1-propanol (AMP) was provided. Finally, three rate promoters–hexamethylene diamine (HMDA), monoethanolamine (MEA) and AMP–were added to AHPD. The performance of HMDA was most promising. In a batch desorption setup, it was shown that alumina catalyst improved desorption of CO2 from loaded AHPD/HMDA mixtures. This work will stimulate further interest in the use of AHPD solutions for CO2 removal.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45237649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-06DOI: 10.1080/00986445.2023.2230563
Fatemeh Golaghaei, A. Mohadesi, S. Ataei, Mohammad Ali Karimi, M. Torabi
Abstract In the current study, the leaching conditions of chalcopyrite/pyrite concentrate were optimized by sulfuric acid and hydrogen peroxide using response surface methodology (RSM). The optimal leaching conditions were found to be a sulfuric acid concentration of 150 g/L, a hydrogen peroxide volume of 350 mL, a temperature of 80 °C, a leaching time of 8h and a solid–liquid ratio of 0.52 g/mL. After analysis of variance (ANOVA), the sulfuric acid concentration and temperature were the most significant process variables for the leaching concentrations of both copper and iron. Under the optimum conditions, the recovery of copper and iron was 81.83% and 67.57%, respectively.
{"title":"Optimizing the leaching conditions of chalcopyrite/pyrite concentrate in Sarcheshmeh Copper Complex using response surface methodology","authors":"Fatemeh Golaghaei, A. Mohadesi, S. Ataei, Mohammad Ali Karimi, M. Torabi","doi":"10.1080/00986445.2023.2230563","DOIUrl":"https://doi.org/10.1080/00986445.2023.2230563","url":null,"abstract":"Abstract In the current study, the leaching conditions of chalcopyrite/pyrite concentrate were optimized by sulfuric acid and hydrogen peroxide using response surface methodology (RSM). The optimal leaching conditions were found to be a sulfuric acid concentration of 150 g/L, a hydrogen peroxide volume of 350 mL, a temperature of 80 °C, a leaching time of 8h and a solid–liquid ratio of 0.52 g/mL. After analysis of variance (ANOVA), the sulfuric acid concentration and temperature were the most significant process variables for the leaching concentrations of both copper and iron. Under the optimum conditions, the recovery of copper and iron was 81.83% and 67.57%, respectively.","PeriodicalId":9725,"journal":{"name":"Chemical Engineering Communications","volume":" ","pages":""},"PeriodicalIF":2.5,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42150653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：