Pub Date : 2017-09-10DOI: 10.3329/CERB.V19I0.33802
N. Abdullah, M. Yahya, R. Mahmod
Strong anion exchange hypercrosslinked of poly(HEMA-co-EGDMA-co-VBC) (PHEV) and strong anion exchange hypercrosslinked of poly(styrene-co-EGDMA-co-VBC) (PSEV) were prepared via amination reaction with dimethylbutyl amine (DMBA) as the amination agent in dried toluene. The resins were characterized by SEM, FTIR, BET and elemental analysis. SEM results showed that there was no significant change of the particles shape after amination reaction for both strong anion exchange hypercrosslinked PHEV and strong anion exchange hypercrosslinked PSEV. Specific surface area (SSA) of strong anion exchange hypercrosslinked PHEV increase from 1035 m2/g to 1090 m2/g when amination reaction take place. However, SSA of strong anion exchange hypercrosslinked PHEV decreased from 124 m2/g to 27 m2/g. From FTIR spectra, significant drop occurred at 1265 cm-1 band after amination reaction of strong anion exchange hypercrosslinked PSEV but SSA of strong anion exchange hypercrosslinkedPHEV showed slightly significant drop. Elemental analysis showed that nitrogen content of strong anion exchange hypercrosslinked PHEV significantly increase from 0.10% to 1.46% resulted to high IEC value. Meanwhile, nitrogen content in strong anion exchange hypercrosslinked PSEV only showed small increment in nitrogen content from 0.36% to 0.63% led to low IEC value.
{"title":"Comparative study of strong anion exchange hypercrosslinked poly(HEMA-co-EGDMA-co-VBC) and strong anion exchange poly(Styrene-co-EGDMA-co-VBC): Synthesis and characterization","authors":"N. Abdullah, M. Yahya, R. Mahmod","doi":"10.3329/CERB.V19I0.33802","DOIUrl":"https://doi.org/10.3329/CERB.V19I0.33802","url":null,"abstract":"Strong anion exchange hypercrosslinked of poly(HEMA-co-EGDMA-co-VBC) (PHEV) and strong anion exchange hypercrosslinked of poly(styrene-co-EGDMA-co-VBC) (PSEV) were prepared via amination reaction with dimethylbutyl amine (DMBA) as the amination agent in dried toluene. The resins were characterized by SEM, FTIR, BET and elemental analysis. SEM results showed that there was no significant change of the particles shape after amination reaction for both strong anion exchange hypercrosslinked PHEV and strong anion exchange hypercrosslinked PSEV. Specific surface area (SSA) of strong anion exchange hypercrosslinked PHEV increase from 1035 m2/g to 1090 m2/g when amination reaction take place. However, SSA of strong anion exchange hypercrosslinked PHEV decreased from 124 m2/g to 27 m2/g. From FTIR spectra, significant drop occurred at 1265 cm-1 band after amination reaction of strong anion exchange hypercrosslinked PSEV but SSA of strong anion exchange hypercrosslinkedPHEV showed slightly significant drop. Elemental analysis showed that nitrogen content of strong anion exchange hypercrosslinked PHEV significantly increase from 0.10% to 1.46% resulted to high IEC value. Meanwhile, nitrogen content in strong anion exchange hypercrosslinked PSEV only showed small increment in nitrogen content from 0.36% to 0.63% led to low IEC value.","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"20 1","pages":"96-101"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84821121","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}
Pub Date : 2017-09-10DOI: 10.3329/CERB.V19I0.33810
R. CheMan, R. Illias, S. Z. Sulaiman, S. K. A. Mudalip, S. Shaarani, Z. Arshad
The excretion of recombinant proteins into the culture medium is a preferred approach over cytoplasmic expression because of the high specific activity and ease of purification. However, cell lysis is one of a major problem during the excretion of recombinant protein due to the pressure build up in the periplasmic space through overproduction of the expressed recombinant protein. Cell immobilization is a promising solution for the improvement of protein excretion with reduction in cell lysis. In this study, the effect of cross linkers concentrations on the process of cell immobilization for the cyclodextringlucanotransferase (CGTase) excretion and cell viability were investigated. The hollow fiber membrane was treated using different concentrations (0.3, 0.67 and 1%) of cross linkers namely glutaraldehyde (GA), poly-L-lysine (PLL) and polyethylenimine (PEI). The optimum concentration of cross linkers was found to be 0.3% with the high excretion of CGTase. Interestingly, the immobilized cell on the non-treated hollow fiber membrane showed up to 15% increment of CGTase excretion with 55% reduction of cell lysis, as compared to the immobilized cells on the treated hollow fiber membrane. It could be concluded that, the low concentration of cross linkers exhibited the highest CGTase excretion. Moreover, the non-treated hollow fiber membrane is a promising approach for attachment of cells to the membrane without requiring treatment with any chemicals for the production of recombinant enzyme. Chemical Engineering Research Bulletin 19(2017) 154-159
{"title":"Effect of the cross linkers concentration on the immobilization of recombinant Escherichia coli cells on hollow fiber membrane for excretion of cyclodextrin glucanotransferase (CGTase)","authors":"R. CheMan, R. Illias, S. Z. Sulaiman, S. K. A. Mudalip, S. Shaarani, Z. Arshad","doi":"10.3329/CERB.V19I0.33810","DOIUrl":"https://doi.org/10.3329/CERB.V19I0.33810","url":null,"abstract":"The excretion of recombinant proteins into the culture medium is a preferred approach over cytoplasmic expression because of the high specific activity and ease of purification. However, cell lysis is one of a major problem during the excretion of recombinant protein due to the pressure build up in the periplasmic space through overproduction of the expressed recombinant protein. Cell immobilization is a promising solution for the improvement of protein excretion with reduction in cell lysis. In this study, the effect of cross linkers concentrations on the process of cell immobilization for the cyclodextringlucanotransferase (CGTase) excretion and cell viability were investigated. The hollow fiber membrane was treated using different concentrations (0.3, 0.67 and 1%) of cross linkers namely glutaraldehyde (GA), poly-L-lysine (PLL) and polyethylenimine (PEI). The optimum concentration of cross linkers was found to be 0.3% with the high excretion of CGTase. Interestingly, the immobilized cell on the non-treated hollow fiber membrane showed up to 15% increment of CGTase excretion with 55% reduction of cell lysis, as compared to the immobilized cells on the treated hollow fiber membrane. It could be concluded that, the low concentration of cross linkers exhibited the highest CGTase excretion. Moreover, the non-treated hollow fiber membrane is a promising approach for attachment of cells to the membrane without requiring treatment with any chemicals for the production of recombinant enzyme. Chemical Engineering Research Bulletin 19(2017) 154-159","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"21 1","pages":"154-159"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83673998","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}
Pub Date : 2017-09-10DOI: 10.3329/CERB.V19I0.33797
F. Mustapha, J. Jai, F. Hamidon, Z. Sharif, N. M. Yusof
Malaysia is among 12 countries in the world that rich in biodiversity including an assortment of plants with potential sources for new antimicrobial agents. Despite the fact that various plants have been screened, the requirement for detail study on antimicrobial compounds from plants is preceded as safer and better agent to inhibit growth of microbes. Therefore, selected Malaysia plants with medicinal properties are listed for further review in their antimicrobial activity and their major compound that act as antimicrobial agent. The major groups of the antimicrobial constituents are phenolics, phenolic acids, quinones, saponins, flavonoids, tannins, coumarins, terpenoids and alkaloids. These compounds are secondary metabolites that play the main role in plant defense mechanism. They also exhibited inhibitory effect on various microorganisms such as Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, Escherichia coli and Candida albicans . Compounds derived from Malaysian plants have the potential to be used as antimicrobial additive as most of their extracts containing active compounds such as caffeic acid, pyrogallol, catechin and curcumin. Extraction method of plants extract is done either by conventional method of maceration and extraction under reflux and steam distillation or modern method of microwave assisted extraction, supercritical fluid extraction and ultrasound-assisted solvent extraction. Even though plants extracts with medicinal properties are gaining fame for their antimicrobial properties, however the study on incorporation of the extracts into edible films as antimicrobial food packaging is limited. The advantages of using an edible film with antimicrobial agent plants for food products are it safe to use and it able to extend the shelf life while reducing packaging waste. Chemical Engineering Research Bulletin 19(2017) 57-66
{"title":"Antimicrobial agents from Malaysian plants and their potential use in food packaging material: Review","authors":"F. Mustapha, J. Jai, F. Hamidon, Z. Sharif, N. M. Yusof","doi":"10.3329/CERB.V19I0.33797","DOIUrl":"https://doi.org/10.3329/CERB.V19I0.33797","url":null,"abstract":"Malaysia is among 12 countries in the world that rich in biodiversity including an assortment of plants with potential sources for new antimicrobial agents. Despite the fact that various plants have been screened, the requirement for detail study on antimicrobial compounds from plants is preceded as safer and better agent to inhibit growth of microbes. Therefore, selected Malaysia plants with medicinal properties are listed for further review in their antimicrobial activity and their major compound that act as antimicrobial agent. The major groups of the antimicrobial constituents are phenolics, phenolic acids, quinones, saponins, flavonoids, tannins, coumarins, terpenoids and alkaloids. These compounds are secondary metabolites that play the main role in plant defense mechanism. They also exhibited inhibitory effect on various microorganisms such as Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, Escherichia coli and Candida albicans . Compounds derived from Malaysian plants have the potential to be used as antimicrobial additive as most of their extracts containing active compounds such as caffeic acid, pyrogallol, catechin and curcumin. Extraction method of plants extract is done either by conventional method of maceration and extraction under reflux and steam distillation or modern method of microwave assisted extraction, supercritical fluid extraction and ultrasound-assisted solvent extraction. Even though plants extracts with medicinal properties are gaining fame for their antimicrobial properties, however the study on incorporation of the extracts into edible films as antimicrobial food packaging is limited. The advantages of using an edible film with antimicrobial agent plants for food products are it safe to use and it able to extend the shelf life while reducing packaging waste. Chemical Engineering Research Bulletin 19(2017) 57-66","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"19 1","pages":"57-66"},"PeriodicalIF":0.0,"publicationDate":"2017-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81439067","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}
Pub Date : 2016-01-04DOI: 10.3329/CERB.V18I1.26216
A. Jhankal
The magneto-hydrodynamics (MHD) boundary layer flow of an electrically conducting upper-convected Maxwell (UCM) fluid in porous medium is studied. The governing similarity equation is solved by He’s Homotopy perturbation method (HPM). The main advantage of HPM is that it does not require the small parameters in the equations and hence the limitations of traditional perturbation can be eliminated. The results reveal that the proposed method is very effective and simple and can be applied to other nonlinear problems. The effects of various physical parameters on the flow presented and discussed through graphs. Chemical Engineering Research Bulletin 18(2015) 12-17
{"title":"Application of homotopy perturbation method for MHD boundary layer flow of an upper-convected Maxwell fluid in a porous medium","authors":"A. Jhankal","doi":"10.3329/CERB.V18I1.26216","DOIUrl":"https://doi.org/10.3329/CERB.V18I1.26216","url":null,"abstract":"The magneto-hydrodynamics (MHD) boundary layer flow of an electrically conducting upper-convected Maxwell (UCM) fluid in porous medium is studied. The governing similarity equation is solved by He’s Homotopy perturbation method (HPM). The main advantage of HPM is that it does not require the small parameters in the equations and hence the limitations of traditional perturbation can be eliminated. The results reveal that the proposed method is very effective and simple and can be applied to other nonlinear problems. The effects of various physical parameters on the flow presented and discussed through graphs. Chemical Engineering Research Bulletin 18(2015) 12-17","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"29 1","pages":"12-17"},"PeriodicalIF":0.0,"publicationDate":"2016-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85300986","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}
Pub Date : 2016-01-04DOI: 10.3329/CERB.V18I1.26214
G. Rasul, I. Ahmed, I. Hossain
Tuning the characteristics of granular activated carbon bed (GAC-bed) in household water-filters would be a technique to maintain iron at the required-level in drinking water. In the present study the individual effects of the depth of GAC-bed and the size and porosity of GAC particles on the iron removing capacity are investigated experimentally. A spectrophotometer is used to measure iron-content in water. It is observed that iron removing capacity increases monotonically with the increase in bed-depth regardless of the size of GAC particles. It is also observed that the iron removing capacity decreases drastically with the increase in the size of GAC particles for any fixed bed-depth. Finally the porosity of GAC particles is found to affect the iron removing capacity. The higher the GAC porosity the higher is the iron removing capacity over the considered porosity-range. It is believed that the observations of present study would be useful in adjusting GAC-bed characteristics at the time of designing household water-filters to maintain iron at the required-level. Chemical Engineering Research Bulletin 18(2015) 1-5
{"title":"Safe drinking water: effect of granular activated carbon bed characteristics on iron removal from water","authors":"G. Rasul, I. Ahmed, I. Hossain","doi":"10.3329/CERB.V18I1.26214","DOIUrl":"https://doi.org/10.3329/CERB.V18I1.26214","url":null,"abstract":"Tuning the characteristics of granular activated carbon bed (GAC-bed) in household water-filters would be a technique to maintain iron at the required-level in drinking water. In the present study the individual effects of the depth of GAC-bed and the size and porosity of GAC particles on the iron removing capacity are investigated experimentally. A spectrophotometer is used to measure iron-content in water. It is observed that iron removing capacity increases monotonically with the increase in bed-depth regardless of the size of GAC particles. It is also observed that the iron removing capacity decreases drastically with the increase in the size of GAC particles for any fixed bed-depth. Finally the porosity of GAC particles is found to affect the iron removing capacity. The higher the GAC porosity the higher is the iron removing capacity over the considered porosity-range. It is believed that the observations of present study would be useful in adjusting GAC-bed characteristics at the time of designing household water-filters to maintain iron at the required-level. Chemical Engineering Research Bulletin 18(2015) 1-5","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"70 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84167337","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}
Pub Date : 2016-01-04DOI: 10.3329/CERB.V18I1.26217
H. Ahmari, M. C. Amiri
Relating surface tension and viscosity of liquids not only is important conceptually but it can also be used to test the validity of some measured data. Schonhorn modified Pelofsky’s equation by introducing the concept of the vapor viscosity η v in equilibrium with the liquid, i.e.γ= Aexp(-B/(η l -η v )) This empirical relation can be applied to both organic and inorganic solutions of pure and mixed components. As surface tension is a strong function of surfactant, they neglected to emphasis that mixed components must not be surface active agents. Both Pelofsky and Schonhorn indicated that A may be an indication of the surface tension of the liquid at the temperature where η=∞. They were not successful in correlating the temperature where and the surface tension at the melting point. In this work, a new empirical equation for relating surface tension and viscosity has been developed, i.e., γ((Tc – Tm)/( Tc – T)) = δ(1-β/η). This equation not only satisfies the extreme conditions but it also reveals a physical concept for δ, that is, it should equal the surface tension at the melting point of the liquid. Chemical Engineering Research Bulletin 18(2015) 18-22
{"title":"On the relationship between surface tension and viscosity of fluids","authors":"H. Ahmari, M. C. Amiri","doi":"10.3329/CERB.V18I1.26217","DOIUrl":"https://doi.org/10.3329/CERB.V18I1.26217","url":null,"abstract":"Relating surface tension and viscosity of liquids not only is important conceptually but it can also be used to test the validity of some measured data. Schonhorn modified Pelofsky’s equation by introducing the concept of the vapor viscosity η v in equilibrium with the liquid, i.e.γ= Aexp(-B/(η l -η v )) This empirical relation can be applied to both organic and inorganic solutions of pure and mixed components. As surface tension is a strong function of surfactant, they neglected to emphasis that mixed components must not be surface active agents. Both Pelofsky and Schonhorn indicated that A may be an indication of the surface tension of the liquid at the temperature where η=∞. They were not successful in correlating the temperature where and the surface tension at the melting point. In this work, a new empirical equation for relating surface tension and viscosity has been developed, i.e., γ((Tc – Tm)/( Tc – T)) = δ(1-β/η). This equation not only satisfies the extreme conditions but it also reveals a physical concept for δ, that is, it should equal the surface tension at the melting point of the liquid. Chemical Engineering Research Bulletin 18(2015) 18-22","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"104 1","pages":"18-22"},"PeriodicalIF":0.0,"publicationDate":"2016-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89153134","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}
Pub Date : 2016-01-04DOI: 10.3329/CERB.V18I1.26218
R. Akila, K. Balu
A regression model for simulating residence time distribution (RTD) of turbulent flows in helical static mixers is proposed and developed to predict the residence time distribution in static mixers. An efficient method is required to estimate the RTD and the sole means of achieving this is through detailed regression model. The RTD was calculated numerically by regression model. The results of the regression model, i.e. predicted RTD is presented in terms of different volumetric flow rate to illustrate the complicated flow patterns that drive the mixing process in helical static mixers. The regression model is found to fit the experimental RTD with a high degree of correlation. Chemical Engineering Research Bulletin 18(2015) 23-29
{"title":"Regression model for fluid flow in a static mixer","authors":"R. Akila, K. Balu","doi":"10.3329/CERB.V18I1.26218","DOIUrl":"https://doi.org/10.3329/CERB.V18I1.26218","url":null,"abstract":"A regression model for simulating residence time distribution (RTD) of turbulent flows in helical static mixers is proposed and developed to predict the residence time distribution in static mixers. An efficient method is required to estimate the RTD and the sole means of achieving this is through detailed regression model. The RTD was calculated numerically by regression model. The results of the regression model, i.e. predicted RTD is presented in terms of different volumetric flow rate to illustrate the complicated flow patterns that drive the mixing process in helical static mixers. The regression model is found to fit the experimental RTD with a high degree of correlation. Chemical Engineering Research Bulletin 18(2015) 23-29","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"389 1","pages":"23-29"},"PeriodicalIF":0.0,"publicationDate":"2016-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80801686","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}
Pub Date : 2016-01-04DOI: 10.3329/CERB.V18I1.26215
M. S. Shukor, M. Shukor
The toxicity of molybdenum to ruminants and its general toxicity to spermatogenesis in animals are increasingly being reported. Its contamination of aquatic bodies has been reported, and this necessitates its removal. In this work, we utilize the dialysis tubing method coupled with the molybdenum-reducing activity of S. marcescens strain Dr.Y6 to remove molybdenum from solution. The enzymatic reduction of molybdenum into the colloidal molybdenum blue traps the reduced product in the dialysis tubing. The initial rate of increase of Mo-blue product was determined using the modified Gompertz model while the resultant inhibition kinetics profile was carried out using the Haldane model. The calculated maximal rate of Mo-blue production was 153 µmole (Mo-blue.hr) -1 and the concentration of molybdate resulting in the half-maximal rate of reduction ( K s ), and the inhibition constant ( K i ) were 0.22 and 506 mM, respectively. The results indicate that the system using dialysis tubing coupled with the Mo-reducing bacterium is a good candidate for a method for molybdenum bioremoval from solution. Chemical Engineering Research Bulletin 18(2015) 6-11
{"title":"Bioremoval of toxic Molybdenum using dialysis tubing","authors":"M. S. Shukor, M. Shukor","doi":"10.3329/CERB.V18I1.26215","DOIUrl":"https://doi.org/10.3329/CERB.V18I1.26215","url":null,"abstract":"The toxicity of molybdenum to ruminants and its general toxicity to spermatogenesis in animals are increasingly being reported. Its contamination of aquatic bodies has been reported, and this necessitates its removal. In this work, we utilize the dialysis tubing method coupled with the molybdenum-reducing activity of S. marcescens strain Dr.Y6 to remove molybdenum from solution. The enzymatic reduction of molybdenum into the colloidal molybdenum blue traps the reduced product in the dialysis tubing. The initial rate of increase of Mo-blue product was determined using the modified Gompertz model while the resultant inhibition kinetics profile was carried out using the Haldane model. The calculated maximal rate of Mo-blue production was 153 µmole (Mo-blue.hr) -1 and the concentration of molybdate resulting in the half-maximal rate of reduction ( K s ), and the inhibition constant ( K i ) were 0.22 and 506 mM, respectively. The results indicate that the system using dialysis tubing coupled with the Mo-reducing bacterium is a good candidate for a method for molybdenum bioremoval from solution. Chemical Engineering Research Bulletin 18(2015) 6-11","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"34 1","pages":"6-11"},"PeriodicalIF":0.0,"publicationDate":"2016-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85209024","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}
Pub Date : 2016-01-04DOI: 10.3329/CERB.V18I1.26219
N. Islam, Abul Hasnat Md Sazedur Rahman, Mehnaz Mursalat, A. Rony, M. Khan
Fruit ripening is a natural process in which a fruit goes through various physical and chemical changes and gradually becomes sweet, coloured, soft and palatable. However, this natural process can also be stimulated by using artificial fruit ripening agents. Farmers and vendors often use artificial ripening agents to control fruit ripening rate. However, because of the potential health hazard related to the ripening agents, artificial fruit ripening process is highly debateable throughout the world. There are existing laws and guidelines to control artificial fruit ripening process. This article deals with the legal aspects of artificial fruit ripening and fruit adulteration in Bangladesh. Different laws and acts to control and prohibit fruit ripening and adulteration using hazardous chemicals are discussed in detailed here. Laws from different developed and developing countries are also listed and discussed here. Furthermore, the technical and economic issues related to the artificial fruit ripening are addressed in this study. This article aims to develop awareness among different stakeholders since it will take the active participation of the government agencies, policymakers, farmers, vendors and scientists to address different aspects of artificial fruit ripening issues and to provide an effective solution. Chemical Engineering Research Bulletin 18(2015) 30-37
{"title":"A legislative aspect of artificial fruit ripening in a developing country like Bangladesh","authors":"N. Islam, Abul Hasnat Md Sazedur Rahman, Mehnaz Mursalat, A. Rony, M. Khan","doi":"10.3329/CERB.V18I1.26219","DOIUrl":"https://doi.org/10.3329/CERB.V18I1.26219","url":null,"abstract":"Fruit ripening is a natural process in which a fruit goes through various physical and chemical changes and gradually becomes sweet, coloured, soft and palatable. However, this natural process can also be stimulated by using artificial fruit ripening agents. Farmers and vendors often use artificial ripening agents to control fruit ripening rate. However, because of the potential health hazard related to the ripening agents, artificial fruit ripening process is highly debateable throughout the world. There are existing laws and guidelines to control artificial fruit ripening process. This article deals with the legal aspects of artificial fruit ripening and fruit adulteration in Bangladesh. Different laws and acts to control and prohibit fruit ripening and adulteration using hazardous chemicals are discussed in detailed here. Laws from different developed and developing countries are also listed and discussed here. Furthermore, the technical and economic issues related to the artificial fruit ripening are addressed in this study. This article aims to develop awareness among different stakeholders since it will take the active participation of the government agencies, policymakers, farmers, vendors and scientists to address different aspects of artificial fruit ripening issues and to provide an effective solution. Chemical Engineering Research Bulletin 18(2015) 30-37","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"49 1","pages":"30-37"},"PeriodicalIF":0.0,"publicationDate":"2016-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82631953","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}
Pub Date : 2015-04-07DOI: 10.3329/CERB.V17I1.22916
N. Khleifia, H. Rania, A. Hannachi
The increased growth in energy demand has a direct impact on the growing interest of uranium extraction. Phosphoric acid attracts a great attention because of its uranium content. The solvent extraction is the most widely used techniques for uranium separation from phosphoric acid. In the present work, the simulation of the uranium extraction along a continuous counter current column has been conducted. A computer code that accounts for mass balances and equilibrium data has been developed. The performed simulations allow to obtain the concentration profiles of uranium along the extraction column and led to assess the effect of operating conditions on the extraction performances. DOI: http://dx.doi.org/10.3329/cerb.v17i1.22916 Chemical Engineering Research Bulletin 17(2015) 34-39
{"title":"Prediction of uranium concentration profiles along a continuous extraction column","authors":"N. Khleifia, H. Rania, A. Hannachi","doi":"10.3329/CERB.V17I1.22916","DOIUrl":"https://doi.org/10.3329/CERB.V17I1.22916","url":null,"abstract":"The increased growth in energy demand has a direct impact on the growing interest of uranium extraction. Phosphoric acid attracts a great attention because of its uranium content. The solvent extraction is the most widely used techniques for uranium separation from phosphoric acid. In the present work, the simulation of the uranium extraction along a continuous counter current column has been conducted. A computer code that accounts for mass balances and equilibrium data has been developed. The performed simulations allow to obtain the concentration profiles of uranium along the extraction column and led to assess the effect of operating conditions on the extraction performances. DOI: http://dx.doi.org/10.3329/cerb.v17i1.22916 Chemical Engineering Research Bulletin 17(2015) 34-39","PeriodicalId":9756,"journal":{"name":"Chemical Engineering Research Bulletin","volume":"88 1","pages":"34-39"},"PeriodicalIF":0.0,"publicationDate":"2015-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76508461","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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