离子液体萃取精馏分离乙酸甲酯/甲醇共沸物
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摘要
以离子液体1-乙基-3-甲基咪唑磷酸二乙酯盐([EMIM]DEP)为萃取剂精馏分离乙酸甲酯/甲醇共沸物。采用Aspen Plus流程模拟软件,对萃取流程进行设计和优化。通过优化溶剂比、全塔理论塔板数、原料进料位置、萃取剂进料位置和回流比等工艺参数,最终产品乙酸甲酯和甲醇质量分数均超过99.5%。通过与二甲基亚砜(DMSO)作为萃取剂的工艺流程对比,[EMIM]DEP流程萃取剂用量仅为DMSO流程萃取剂用量的17%,能耗仅为DMSO流程的45%。在2个流程均能满足分离要求的前提下,[EMIM]DEP流程的塔板数、回流比、能耗均低于DMSO流程,这也意味着设备投资费用和生产操作费用更低。
The ionic liquid 1-ethyl-3-methylimidazolium diethylphosphate([EMIM]DEP) was used as the solvent to separate methyl acetate/methanol azeotrope. Aspen Plus software was used to design and optimize the extraction process. Solvent ratio, theoretical plate number, feed position, reflux ratio and other factors were optimized to obtain methyl acetate and methanol with mass fraction above 99.5%.Compared to the dimethyl sulfoxide(DMSO) process, [EMIM]DEP solvent was only 17% of DMSO solvent,and the total energy consumption of [EMIM]DEP process was only 45% of DMSO process. [EMIM]DEP process showed fewer number of trays, smaller reflux ratio and lower energy consumption than DMSO process. It means lower equipment investment costs and lower production costs of [EMIM]DEP process.
The ionic liquid 1-ethyl-3-methylimidazolium diethylphosphate([EMIM]DEP) was used as the solvent to separate methyl acetate/methanol azeotrope. Aspen Plus software was used to design and optimize the extraction process. Solvent ratio, theoretical plate number, feed position, reflux ratio and other factors were optimized to obtain methyl acetate and methanol with mass fraction above 99.5%.Compared to the dimethyl sulfoxide(DMSO) process, [EMIM]DEP solvent was only 17% of DMSO solvent,and the total energy consumption of [EMIM]DEP process was only 45% of DMSO process. [EMIM]DEP process showed fewer number of trays, smaller reflux ratio and lower energy consumption than DMSO process. It means lower equipment investment costs and lower production costs of [EMIM]DEP process.
引文
[1]田征,崔现宝,彭艳枚,等.离子液体萃取精馏分离乙酸甲酯-甲醇共沸物[J].石油化工,2013,42(5):537-541.
[2]曹君.离子液体用于乙酸甲酯与甲醇共沸体系的分离行为研究[D].北京:北京化工大学,2015.
[3]王克良,李静,黄禹,等.离子液体萃取精馏分离乙醇和2-丁酮共沸体系的过程模拟[J].现代化工,2017,37(5):185-188.
[4]殷甲楠,杜敬文,樊丽华,等.洗油在煤有机溶剂萃取中的应用研究[J].煤炭技术,2015,34(11):244-246.
[5]曹慧斌,王洪海,李春利,等.乙酸甲酯-甲醇-水的热集成萃取精馏工艺[J].现代化工,2017,37(4):148-151,153.
[6]高晓新,朱碧云,顾强,等.双溶剂协同萃取精馏分离乙酸甲酯-甲醇-水工艺模拟[J].过程工程学报,2017,17(2):254-258.
[7]李群生,曹玲,孙雪婷,等.乙酸甲酯-甲醇-1-乙基-3-甲基咪唑四氟硼酸盐物系等压汽液平衡数据的测定与关联[J].石油化工,2013,42(6):636-640.
[2]曹君.离子液体用于乙酸甲酯与甲醇共沸体系的分离行为研究[D].北京:北京化工大学,2015.
[3]王克良,李静,黄禹,等.离子液体萃取精馏分离乙醇和2-丁酮共沸体系的过程模拟[J].现代化工,2017,37(5):185-188.
[4]殷甲楠,杜敬文,樊丽华,等.洗油在煤有机溶剂萃取中的应用研究[J].煤炭技术,2015,34(11):244-246.
[5]曹慧斌,王洪海,李春利,等.乙酸甲酯-甲醇-水的热集成萃取精馏工艺[J].现代化工,2017,37(4):148-151,153.
[6]高晓新,朱碧云,顾强,等.双溶剂协同萃取精馏分离乙酸甲酯-甲醇-水工艺模拟[J].过程工程学报,2017,17(2):254-258.
[7]李群生,曹玲,孙雪婷,等.乙酸甲酯-甲醇-1-乙基-3-甲基咪唑四氟硼酸盐物系等压汽液平衡数据的测定与关联[J].石油化工,2013,42(6):636-640.