Pub Date : 2015-03-31DOI: 10.2174/1874123101509010007
P. Lv, Ming-yuan Li, M. Lin, Bo Peng, Z. Dong, Zihao Yang
Viscosity-concentration and temperature performance are the prerequisite constraint factor of the application of polymer flooding in the oilfield. The static and dynamic adsorption of the polymer in the core can affect the performance of polymer flooding. Based on the viscosity-concentration, temperature and the static, dynamic adsorption results of six kinds of polymers, DQ3500 is chosen as the most suitable polymer for Zahra oilfield. Its affects show that oil recovery is increased by 7% and water cut is reduced by 20%. Keyword: Enhanced oil recovery, Polymer viscosity-concentration, Static dynamic adsorption, Temperature performance, Water cut.
{"title":"Adaptability Evaluation of Polymer Flooding for Zahra Oil Field","authors":"P. Lv, Ming-yuan Li, M. Lin, Bo Peng, Z. Dong, Zihao Yang","doi":"10.2174/1874123101509010007","DOIUrl":"https://doi.org/10.2174/1874123101509010007","url":null,"abstract":"Viscosity-concentration and temperature performance are the prerequisite constraint factor of the application of polymer flooding in the oilfield. The static and dynamic adsorption of the polymer in the core can affect the performance of polymer flooding. Based on the viscosity-concentration, temperature and the static, dynamic adsorption results of six kinds of polymers, DQ3500 is chosen as the most suitable polymer for Zahra oilfield. Its affects show that oil recovery is increased by 7% and water cut is reduced by 20%. Keyword: Enhanced oil recovery, Polymer viscosity-concentration, Static dynamic adsorption, Temperature performance, Water cut.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"45 1","pages":"7-13"},"PeriodicalIF":0.0,"publicationDate":"2015-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82218656","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 : 2015-02-26DOI: 10.2174/1874123101509010001
M. Meireles, I. C. Debien, A. A. Rigo, M. Corazza, M. Mazutti, J. V. Oliveira
This short communication reports the thermodynamic modeling of high-pressure equilibrium data (cloud points) for the systems L-lactic acid + (propane + ethanol) and L-lactic acid + (carbon dioxide + ethanol) from 323.15 K to 353.15 K and at pressures up to 25 MPa.The experimental data were modeled using the Peng-Robinson equation of state with the classical van der Waals quadratic mixing rule (PR-vdW2) and with the Wong-Sandler mixing rule (PR- WS). It is shown that the PR-vdW2 and PR-WS models were both able to satisfactorily represent the phase behavior of the system L-lactic acid + (carbon dioxide + ethanol). However, for the system L-lactic acid + (propane + ethanol), the PR-vdW2 model was not able to appropriately describe its phase behavior.
{"title":"Thermodynamic Modeling of High-pressure Equilibrium Data for the Systems L-lactic Acid + (Propane + Ethanol) and L-lactic Acid + (Carbon Dioxide + Ethanol)","authors":"M. Meireles, I. C. Debien, A. A. Rigo, M. Corazza, M. Mazutti, J. V. Oliveira","doi":"10.2174/1874123101509010001","DOIUrl":"https://doi.org/10.2174/1874123101509010001","url":null,"abstract":"This short communication reports the thermodynamic modeling of high-pressure equilibrium data (cloud points) for the systems L-lactic acid + (propane + ethanol) and L-lactic acid + (carbon dioxide + ethanol) from 323.15 K to 353.15 K and at pressures up to 25 MPa.The experimental data were modeled using the Peng-Robinson equation of state with the classical van der Waals quadratic mixing rule (PR-vdW2) and with the Wong-Sandler mixing rule (PR- WS). It is shown that the PR-vdW2 and PR-WS models were both able to satisfactorily represent the phase behavior of the system L-lactic acid + (carbon dioxide + ethanol). However, for the system L-lactic acid + (propane + ethanol), the PR-vdW2 model was not able to appropriately describe its phase behavior.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"140 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2015-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86673310","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 : 2014-12-31DOI: 10.2174/1874123101408010032
Jie Yang, Bao-jie Zhang, X. Peng, Hua Wang, Zhihang Li, W. Cai, Hongda Fang
This study concerns the distribution and potential sources of elevated heavy metal concentrations (Cu, Zn, Pb, Cd, As) in surface sediments of the Dongzhai Harbor, Hainan Island,a national important mangrove ecosystem protection area.It was found that the pollution of As may occur occasional biological effect by numerical Sediment Quality Guidelines. Further, Geoaccumulation indices (Igeo) suggest there are serious pollution levels of As at all five stations. Spatial distribution of ecotoxicological index and pollution load index suggested that most of the surface sediments have a 9% probability of being toxic and the potential ecological risk zone appear in northern and southern of Dongzhai Harbor. Correlation analysis, principal component analysis, and cluster analysis showed that these metals primarily originate from natural sources. As and Pb resulted primarily from aquaculture, and combustion of gasoline and diesel fuel by ships. The present study provides a baseline record of heavy metals in mangrove surface sediments on the Dongzhai Harbor, and provide a useful aid for sustainable marine management in this region.
{"title":"Sediment Quality Assessment for Heavy Metal Contamination in theDongzhai Harbor (Hainan Island, China) with Pollution Indice Approach","authors":"Jie Yang, Bao-jie Zhang, X. Peng, Hua Wang, Zhihang Li, W. Cai, Hongda Fang","doi":"10.2174/1874123101408010032","DOIUrl":"https://doi.org/10.2174/1874123101408010032","url":null,"abstract":"This study concerns the distribution and potential sources of elevated heavy metal concentrations (Cu, Zn, Pb, Cd, As) in surface sediments of the Dongzhai Harbor, Hainan Island,a national important mangrove ecosystem protection area.It was found that the pollution of As may occur occasional biological effect by numerical Sediment Quality Guidelines. Further, Geoaccumulation indices (Igeo) suggest there are serious pollution levels of As at all five stations. Spatial distribution of ecotoxicological index and pollution load index suggested that most of the surface sediments have a 9% probability of being toxic and the potential ecological risk zone appear in northern and southern of Dongzhai Harbor. Correlation analysis, principal component analysis, and cluster analysis showed that these metals primarily originate from natural sources. As and Pb resulted primarily from aquaculture, and combustion of gasoline and diesel fuel by ships. The present study provides a baseline record of heavy metals in mangrove surface sediments on the Dongzhai Harbor, and provide a useful aid for sustainable marine management in this region.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"69 1","pages":"32-37"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79691038","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 : 2014-12-31DOI: 10.2174/1874123101408010025
Xiu-guo Lu, Ji-Hong Duan, Yue Deng
Study on using ascorbic acid and ferrous reduction method to removal the chlorate ions (ClO 3 - ) in the water. The results show that 100 mL 3.06 mg/L of ClO 3 - in ascorbic acid and ClO 3 - quality ratio 7.19, pH =6.2,35℃, the reaction time of for 15 min, the removal rate was 100%. And ferrous reduction method to remove 100mL 3.06 mg/L of ClO 3 - in pH = 6.2, Fe 2+ and ClO 3 - quality ratio 1.79, 30℃ for 30min, the removal rate was 51%.
{"title":"Experimental Study on Chemical Reduction Method to Remove the ChlorateIons in the Water","authors":"Xiu-guo Lu, Ji-Hong Duan, Yue Deng","doi":"10.2174/1874123101408010025","DOIUrl":"https://doi.org/10.2174/1874123101408010025","url":null,"abstract":"Study on using ascorbic acid and ferrous reduction method to removal the chlorate ions (ClO 3 - ) in the water. The results show that 100 mL 3.06 mg/L of ClO 3 - in ascorbic acid and ClO 3 - quality ratio 7.19, pH =6.2,35℃, the reaction time of for 15 min, the removal rate was 100%. And ferrous reduction method to remove 100mL 3.06 mg/L of ClO 3 - in pH = 6.2, Fe 2+ and ClO 3 - quality ratio 1.79, 30℃ for 30min, the removal rate was 51%.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"30 1","pages":"25-31"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91227641","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 : 2014-12-31DOI: 10.2174/1874123101408010038
Guochao Lu
To study the method about structure layer of geocell reinforced with macadam, as well as effectiveness and practicality of such a method in foundation reinforcement during work progress of civil engineering; Method: Basic theo- ry and method about foundation reinforcement structure applied in work process of civil engineering have been studied. Physical model of experimental tank built by loaded plates has been established. Experiments have been conducted on the loaded-plate tank for geocells in different specification and filler in the geocell to determine the relationship between loads at various of structure layers and longitudinal travel; Experimental results showed that structure layer of geocell re- inforced with macadam could improve vertical deformation in a better way, whose efficiency became smaller along with weld spacing of geocell getting larger within a certain range. Besides, specification of the filler also imposed effects onto the reinforcement efficiency, where filler with larger particle diameter brought about better reinforcement effects. The ex- perimental results demonstrated rationality and effectiveness of structure layer of geocell reinforced with macadam and provided staff members responsible for civil engineering construction with reference on selecting the foundation rein- forcement scheme.
{"title":"Application & Research on Foundation Stabilization Structure duringWork Progress of Civil Engineering","authors":"Guochao Lu","doi":"10.2174/1874123101408010038","DOIUrl":"https://doi.org/10.2174/1874123101408010038","url":null,"abstract":"To study the method about structure layer of geocell reinforced with macadam, as well as effectiveness and practicality of such a method in foundation reinforcement during work progress of civil engineering; Method: Basic theo- ry and method about foundation reinforcement structure applied in work process of civil engineering have been studied. Physical model of experimental tank built by loaded plates has been established. Experiments have been conducted on the loaded-plate tank for geocells in different specification and filler in the geocell to determine the relationship between loads at various of structure layers and longitudinal travel; Experimental results showed that structure layer of geocell re- inforced with macadam could improve vertical deformation in a better way, whose efficiency became smaller along with weld spacing of geocell getting larger within a certain range. Besides, specification of the filler also imposed effects onto the reinforcement efficiency, where filler with larger particle diameter brought about better reinforcement effects. The ex- perimental results demonstrated rationality and effectiveness of structure layer of geocell reinforced with macadam and provided staff members responsible for civil engineering construction with reference on selecting the foundation rein- forcement scheme.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"183 1","pages":"38-42"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80418247","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 : 2014-12-31DOI: 10.2174/1874123101408010019
Ping Zhang, Liang He, Tao Zhang, Peishu Huo
The unreasonable agricultural management measure is the main cause of the risk of nitrogen and phosphorus losses. The objective of this paper was to evaluate the impacts of agricultural management practices on the risk of nitrogen and phosphorus losses at catchment scales based on GIS and integrated index models. The results showed that 93.1% of the catchment was no risk and low risk area, while 6.9% for medium and high risk of nitrogen and phosphorus losses. Spatial analysis of risk index indicated that different agricultural management practices lead to number and proportion of grids are different. At very high risk area, about 599 of grid number is only for the actual management practice, accounting for 0.22% of the total, while at very low risk area, 165884.00 and 60.51% for river buffer zone respectively. Control effect of different agricultural management practices for risk of nitrogen and phosphorus losses is better, which very low and low risk areas of based fertilizer applied deeply and buffer zone construction accounted for 98% and 95.6%, and the control effect sorted as follows: base fertilizer applied deeply> construction of river buffer zone> reduced nitrogen application> reduced phosphorus application.
{"title":"Impacts of Agricultural Management Practices on the Risk of Nitrogen and Phosphorus Losses at Catchment Scales by Using GIS and Index Models","authors":"Ping Zhang, Liang He, Tao Zhang, Peishu Huo","doi":"10.2174/1874123101408010019","DOIUrl":"https://doi.org/10.2174/1874123101408010019","url":null,"abstract":"The unreasonable agricultural management measure is the main cause of the risk of nitrogen and phosphorus losses. The objective of this paper was to evaluate the impacts of agricultural management practices on the risk of nitrogen and phosphorus losses at catchment scales based on GIS and integrated index models. The results showed that 93.1% of the catchment was no risk and low risk area, while 6.9% for medium and high risk of nitrogen and phosphorus losses. Spatial analysis of risk index indicated that different agricultural management practices lead to number and proportion of grids are different. At very high risk area, about 599 of grid number is only for the actual management practice, accounting for 0.22% of the total, while at very low risk area, 165884.00 and 60.51% for river buffer zone respectively. Control effect of different agricultural management practices for risk of nitrogen and phosphorus losses is better, which very low and low risk areas of based fertilizer applied deeply and buffer zone construction accounted for 98% and 95.6%, and the control effect sorted as follows: base fertilizer applied deeply> construction of river buffer zone> reduced nitrogen application> reduced phosphorus application.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"77 1","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2014-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86042360","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 : 2014-05-30DOI: 10.2174/1874123101004010011
E. Franceschi, A. M. Cezaro, S. R. Ferreira, M. H. Kunita, E. Muniz, A. Rubira, J. V. Oliveira
The objective of this work was to investigate the application of supercritical carbon dioxide as antisolvent for the co-precipitation of -carotene and poly(hydroxybutirate-co-hydroxyvalerate) (PHBV) with dichloromethane as or- ganic solvent. For this purpose, the concentrations of -carotene (1 to 8 mg.cm -3 ) and PHBV (20 to 40 mg.cm -3 ) in the or- ganic solution were varied keeping fixed temperature at 313 K, pressure at 8 MPa, solution flow rate at 1 cm 3 .min -1 and antisolvent flow rate at 39 g.min -1 . The morphology of co-precipitated particles were spherical with very irregular and po- rous surface for some conditions and very smooth surfaces for others as verified by micrographs of scanning electronic microscopy (SEM). Results show that it is possible to achieve encapsulation efficiency values as high as 35 % just ma- nipulating the concentration ratio of solute to polymer in organic solution. The methodology adopted for the quantification of -carotene encapsulated was demonstrated to be adequate.
{"title":"Co-Precipitation of Beta-Carotene and Bio-Polymer Using Supercritical Carbon Dioxide as Antisolvent","authors":"E. Franceschi, A. M. Cezaro, S. R. Ferreira, M. H. Kunita, E. Muniz, A. Rubira, J. V. Oliveira","doi":"10.2174/1874123101004010011","DOIUrl":"https://doi.org/10.2174/1874123101004010011","url":null,"abstract":"The objective of this work was to investigate the application of supercritical carbon dioxide as antisolvent for the co-precipitation of -carotene and poly(hydroxybutirate-co-hydroxyvalerate) (PHBV) with dichloromethane as or- ganic solvent. For this purpose, the concentrations of -carotene (1 to 8 mg.cm -3 ) and PHBV (20 to 40 mg.cm -3 ) in the or- ganic solution were varied keeping fixed temperature at 313 K, pressure at 8 MPa, solution flow rate at 1 cm 3 .min -1 and antisolvent flow rate at 39 g.min -1 . The morphology of co-precipitated particles were spherical with very irregular and po- rous surface for some conditions and very smooth surfaces for others as verified by micrographs of scanning electronic microscopy (SEM). Results show that it is possible to achieve encapsulation efficiency values as high as 35 % just ma- nipulating the concentration ratio of solute to polymer in organic solution. The methodology adopted for the quantification of -carotene encapsulated was demonstrated to be adequate.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"21 1","pages":"11-20"},"PeriodicalIF":0.0,"publicationDate":"2014-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79649069","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 : 2014-05-30DOI: 10.2174/1874123101004010051
M. R. M. Júnior, A. Leite, N. Dragano
Phenolic compounds are components commonly found in fruits and vegetables. Recently, they have been sub- ject of considerable scientific and therapeutic interest mainly due to their antioxidant properties and related health- promoting benefits, as confirmed by the numerous papers devoted to various properties of these compounds. Thus, the ex- tractions of phenolic compounds with functional properties from natural sources have attracted special interests. Super- critical fluid extraction offers a number of advantages over conventional extraction methods above all in relation to the conditions employed during the extraction process that ensures minimal alteration of the active phenolics and the healing properties could be more easily preserved. This work provides an updated overview on the principal applications of Su- percritical fluid extraction in recovery of bioactive phenolics emphasizing the effects of temperature, pressure, addition of co-solvents and time on the extraction yield of these compounds and their antioxidant activities for a possible applications in food, cosmetic or pharmaceutical industries.
{"title":"Supercritical Fluid Extraction and Stabilization of Phenolic CompoundsFrom Natural Sources – Review (Supercritical Extraction and Stabilizationof Phenolic Compounds)","authors":"M. R. M. Júnior, A. Leite, N. Dragano","doi":"10.2174/1874123101004010051","DOIUrl":"https://doi.org/10.2174/1874123101004010051","url":null,"abstract":"Phenolic compounds are components commonly found in fruits and vegetables. Recently, they have been sub- ject of considerable scientific and therapeutic interest mainly due to their antioxidant properties and related health- promoting benefits, as confirmed by the numerous papers devoted to various properties of these compounds. Thus, the ex- tractions of phenolic compounds with functional properties from natural sources have attracted special interests. Super- critical fluid extraction offers a number of advantages over conventional extraction methods above all in relation to the conditions employed during the extraction process that ensures minimal alteration of the active phenolics and the healing properties could be more easily preserved. This work provides an updated overview on the principal applications of Su- percritical fluid extraction in recovery of bioactive phenolics emphasizing the effects of temperature, pressure, addition of co-solvents and time on the extraction yield of these compounds and their antioxidant activities for a possible applications in food, cosmetic or pharmaceutical industries.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"65 1","pages":"51-60"},"PeriodicalIF":0.0,"publicationDate":"2014-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86253862","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 : 2014-05-30DOI: 10.2174/1874123101004010003
W. M. Giufrida, R. Favareto, Vladimir F. Giufrida, Willyan M. Cabral, M. Meireles, L. Cardozo-Filho, M. Corazza
In the present work phase equilibrium data for the ternary systems CO2 + ethanol + curcumin and CO2 + ethyl acetate + curcumin, at different concentrations of curcumin in the organic solvent (0.01 g cm -3 , 0.005 g cm -3 for ethanol and 0.01 g cm -3 , 0.0025 g cm -3 for ethyl acetate) are reported. The static synthetic method, using a variable-volume view cell was employed for obtaining the experimental data in the temperature range of (303 to 333) K and pressures up to 11 MPa. Vapor-liquid phase transitions were observed as bubble and dew points for the overall compositions investigated. The phase equilibria of the ternary systems were fitted to the Peng-Robinson equation of state (PR-EoS) using only binary system information. Experimental data together with modeling results may constitute relevant information for the precipitation of curcumin using the supercritical antisolvent process.
本文报道了CO2 +乙醇+姜黄素和CO2 +乙酸乙酯+姜黄素三元体系在不同浓度的有机溶剂(乙醇为0.01 g cm -3、0.005 g cm -3，乙酸乙酯为0.01 g cm -3、0.0025 g cm -3)下的相平衡数据。采用静态合成方法，在温度为(303 ~ 333)K，压力为11 MPa的条件下，采用变体积观察池获得实验数据。汽液相变以气泡和露点的形式被观察到。仅利用二元系统的信息，将三元体系的相平衡拟合到Peng-Robinson状态方程(PR-EoS)。实验数据和模拟结果可为超临界反溶剂法沉淀姜黄素提供相关信息。
{"title":"High-Pressure Vapor-Liquid Equilibrium Data for Ternary Systems CO2+ Organic Solvent + Curcumin","authors":"W. M. Giufrida, R. Favareto, Vladimir F. Giufrida, Willyan M. Cabral, M. Meireles, L. Cardozo-Filho, M. Corazza","doi":"10.2174/1874123101004010003","DOIUrl":"https://doi.org/10.2174/1874123101004010003","url":null,"abstract":"In the present work phase equilibrium data for the ternary systems CO2 + ethanol + curcumin and CO2 + ethyl acetate + curcumin, at different concentrations of curcumin in the organic solvent (0.01 g cm -3 , 0.005 g cm -3 for ethanol and 0.01 g cm -3 , 0.0025 g cm -3 for ethyl acetate) are reported. The static synthetic method, using a variable-volume view cell was employed for obtaining the experimental data in the temperature range of (303 to 333) K and pressures up to 11 MPa. Vapor-liquid phase transitions were observed as bubble and dew points for the overall compositions investigated. The phase equilibria of the ternary systems were fitted to the Peng-Robinson equation of state (PR-EoS) using only binary system information. Experimental data together with modeling results may constitute relevant information for the precipitation of curcumin using the supercritical antisolvent process.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"69 1","pages":"3-10"},"PeriodicalIF":0.0,"publicationDate":"2014-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89616265","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 : 2014-05-30DOI: 10.2174/1874123101004010042
D. Santos, M. Angela A. Meireles
Supercritical fluids have become an attractive alternative due to environmentally friendly solvents. The meth- ods that use supercritical fluids can be conveniently used for various applications such as extraction, reactions, particle formation and encapsulation. For encapsulation purposes, the processing conditions given by supercritical technology have important advantages over other methods that include harsh treatments with regard to pH, temperature, light, the use of organic solvents, etc. Unstable functional pigments such as carotenoids extracted from natural sources have been en- capsulated to overcome instability problem. Thus, the most used techniques applicable to this intention are described and discussed in this review as well the recent advances and recent trends in this topic that involves the use of supercritical fluids.
{"title":"Carotenoid Pigments Encapsulation: Fundamentals, Techniques andRecent Trends","authors":"D. Santos, M. Angela A. Meireles","doi":"10.2174/1874123101004010042","DOIUrl":"https://doi.org/10.2174/1874123101004010042","url":null,"abstract":"Supercritical fluids have become an attractive alternative due to environmentally friendly solvents. The meth- ods that use supercritical fluids can be conveniently used for various applications such as extraction, reactions, particle formation and encapsulation. For encapsulation purposes, the processing conditions given by supercritical technology have important advantages over other methods that include harsh treatments with regard to pH, temperature, light, the use of organic solvents, etc. Unstable functional pigments such as carotenoids extracted from natural sources have been en- capsulated to overcome instability problem. Thus, the most used techniques applicable to this intention are described and discussed in this review as well the recent advances and recent trends in this topic that involves the use of supercritical fluids.","PeriodicalId":22933,"journal":{"name":"The Open Chemical Engineering Journal","volume":"76 1","pages":"42-50"},"PeriodicalIF":0.0,"publicationDate":"2014-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76446532","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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