活性填料对乙酸乙酯-乙醇共沸物气液平衡的影响
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摘要
为高效分离乙酸乙酯-乙醇共沸物,实验测定了乙酸乙酯-乙醇溶液在常压下气液平衡数据和活性毛细管填料对其的影响,为活性填料毛细管精馏高效分离共沸物提供了依据。首先测定了无填料时乙酸乙酯-乙醇二元气液平衡数据,经Herington面积法检验,符合热力学一致性;用热力学模型关联,效果良好;然后加入活性氧化铝、椰壳活性炭和13X分子筛,测定不同种类和不同含量的活性填料对乙酸乙酯-乙醇气液平衡数据的影响,结果表明:13X分子筛对乙酸乙酯-乙醇气液平衡数据基本无影响;椰壳活性炭影响居中;活性氧化铝影响最大,可将乙酸乙酯的共沸摩尔组成从0. 54提高到0. 77。由此可知,活性氧化铝有利于乙酸乙酯-乙醇共沸物的分离。
To separate binary azeotrope of ethyl acetate and ethanol efficiently,the vapor-liquid equilibrium data of ethyl acetate and ethanol under atmospheric pressure,and the effects of active packing with capillary structure on it,were measured. It provided the basis for the development of the active packing capillary distillation to separate azeotrope efficiently. The measured vapor-liquid equilibrium data without active packing were verified to satisfy the thermodynamic consistency by the Herington method and were correlated very well by thermodynamic models. Then the effect of different kinds and amounts of active packing on vapor-liquid equilibrium data was measured. The results show that 13 X molecular sieve has no effect on the vapor-liquid equilibrium data,coconut activated carbon has a little effect on it,and the activated alumina has a great effect on it and the azeotropic mole fraction of ethyl acetate could be increased from 0. 54 to 0. 77. Therefore,the activated alumina is good for the separation of ethyl acetate-ethanol.
To separate binary azeotrope of ethyl acetate and ethanol efficiently,the vapor-liquid equilibrium data of ethyl acetate and ethanol under atmospheric pressure,and the effects of active packing with capillary structure on it,were measured. It provided the basis for the development of the active packing capillary distillation to separate azeotrope efficiently. The measured vapor-liquid equilibrium data without active packing were verified to satisfy the thermodynamic consistency by the Herington method and were correlated very well by thermodynamic models. Then the effect of different kinds and amounts of active packing on vapor-liquid equilibrium data was measured. The results show that 13 X molecular sieve has no effect on the vapor-liquid equilibrium data,coconut activated carbon has a little effect on it,and the activated alumina has a great effect on it and the azeotropic mole fraction of ethyl acetate could be increased from 0. 54 to 0. 77. Therefore,the activated alumina is good for the separation of ethyl acetate-ethanol.
引文
[1]吴莉莉,管国锋,陈学梅.乙酸乙酯-水共沸体系萃取精馏萃取剂的分子设计[J].计算机与应用化学,2011,28(5):647-650.
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[3]李钢,徐立飞,王克良,等.乙酸乙酯和乙醇共沸体系的萃取剂筛选[J].科技风,2017(8):186-186.
[4]张继国,李群生,黄小侨,等.离子液体应用于乙酸乙酯-乙醇体系萃取精馏[J].化工进展,2009,28(s2):291-293.
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[6]余国琮,袁希钢,李根浩.六十年来《化工学报》上发表有关精馏过程论文的回顾[J].化工学报,2013,64(1):11-27.
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[11]张在春.利用活性填料分离共沸物系的基础研究[D].天津:天津大学,2009.
[12]王凯,程毅,许兰淑,等.糠醛-环己醇-莰烯三元气液平衡数据的测定[J].生物质化学工程,2016,50(1):29-34.
[13]ORCHILLS A V,MIGUEL P J,ERNESTO VERCHER A,et al.Isobaric vapor-liquid equilibria for ethyl acetate+ethanol+1-ethyl-3-methylimidazolium trifluoromethanesulfonate at 100 k Pa[J].J Chem Eng Data,2007,52(3):2325-2330.
[14]娄升伟.离子液体用于乙酸乙酯与乙醇共沸体系分离的汽液平衡研究[D].北京:北京化工大学,2016.
[15]HERINGTON E F G.Tests for consistency of experimental isobaric vapor liquid equilibrium data[J].Journal of Institute of Petroleum,1951,37:457-470.
[16]陈光进.化工热力学[M].北京:石油工业出版社,2006.
[17]RENON H,PRAUSNITZ J M.Local compositions in thermodynamic excess functions for liquid mixtures[J].Aiche Journal,1968,14(1):135-144.
[18]WILSON G M.Vapor-liquid equilibrium.XI.A new expression for the excess free energy of mixing[J].J Am Chem Soc,1964,86(2):127-130.
[19]ABRAMS D S,PRAUSNITZ J M.Statistical thermodynamics of liquid mixtures:A new expression for the excess Gibbs energy of partly or completely miscible systems[J].Aiche Journal,2010,21(1):116-128.
[20]ABU AL-RUB F A,DATTA R.Theoretical study of vapor pressure of pure liquids in porous media[J].Fluid Phase Equilibria,1998,147(1/2):65-83.
[21]JUMAH R.Vapor-liquid equilibrium of ethanol-water system in the presence of molecular sieves[J].Separation Science&Technology,1999,34(12):2355-2368.
[2]金栋,肖明.乙酸乙酯的生产技术进展及市场分析[J].精细石油化工进展,2010,11(6):15-22.
[3]李钢,徐立飞,王克良,等.乙酸乙酯和乙醇共沸体系的萃取剂筛选[J].科技风,2017(8):186-186.
[4]张继国,李群生,黄小侨,等.离子液体应用于乙酸乙酯-乙醇体系萃取精馏[J].化工进展,2009,28(s2):291-293.
[5]顾正桂,林军.加盐复合萃取精馏分离乙酸乙酯-乙醇-水混合液的方法:CN,1706799A[P].2005-12-14.
[6]余国琮,袁希钢,李根浩.六十年来《化工学报》上发表有关精馏过程论文的回顾[J].化工学报,2013,64(1):11-27.
[7]YEH G C,SHAH M S,YEH B V.Vapor-liquid equilibria of nonelectrolyte solutions in small capillaries.1.Experimental determination of equilibrium composition[J].Langmuir,1986,2(1):90-96.
[8]YEH G C.Separation of liquid mixtures:US,4118285A[P].1978-10-03.
[9]BANAT F A,ABU AL-RUB F A,SIMANDL J.Isothermal vapor-liquid equilibrium of acetone-water mixture in the presence of molecular sieves[J].Separation Science&Technology,2001,36(3):487-497.
[10]ABU AL-RUB F A,BANAT F A,SIMANDL J.Isothermal vapour-liquid equilibrium of 1-propanol-water mixtures in the presence of molecular sieves[J].Chemical Engineering Research&Design,2000,78(5):779-782.
[11]张在春.利用活性填料分离共沸物系的基础研究[D].天津:天津大学,2009.
[12]王凯,程毅,许兰淑,等.糠醛-环己醇-莰烯三元气液平衡数据的测定[J].生物质化学工程,2016,50(1):29-34.
[13]ORCHILLS A V,MIGUEL P J,ERNESTO VERCHER A,et al.Isobaric vapor-liquid equilibria for ethyl acetate+ethanol+1-ethyl-3-methylimidazolium trifluoromethanesulfonate at 100 k Pa[J].J Chem Eng Data,2007,52(3):2325-2330.
[14]娄升伟.离子液体用于乙酸乙酯与乙醇共沸体系分离的汽液平衡研究[D].北京:北京化工大学,2016.
[15]HERINGTON E F G.Tests for consistency of experimental isobaric vapor liquid equilibrium data[J].Journal of Institute of Petroleum,1951,37:457-470.
[16]陈光进.化工热力学[M].北京:石油工业出版社,2006.
[17]RENON H,PRAUSNITZ J M.Local compositions in thermodynamic excess functions for liquid mixtures[J].Aiche Journal,1968,14(1):135-144.
[18]WILSON G M.Vapor-liquid equilibrium.XI.A new expression for the excess free energy of mixing[J].J Am Chem Soc,1964,86(2):127-130.
[19]ABRAMS D S,PRAUSNITZ J M.Statistical thermodynamics of liquid mixtures:A new expression for the excess Gibbs energy of partly or completely miscible systems[J].Aiche Journal,2010,21(1):116-128.
[20]ABU AL-RUB F A,DATTA R.Theoretical study of vapor pressure of pure liquids in porous media[J].Fluid Phase Equilibria,1998,147(1/2):65-83.
[21]JUMAH R.Vapor-liquid equilibrium of ethanol-water system in the presence of molecular sieves[J].Separation Science&Technology,1999,34(12):2355-2368.
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