摘要
分别以乙二醇、氯化胆碱/乙二醇(摩尔比1∶2,DES1)、氯化胆碱/乙醇酸(摩尔比1∶3,DES2)低共熔溶剂为萃取剂,设计萃取精馏和萃取隔壁塔流程,模拟分离乙腈和水形成的共沸体系。使用灵敏度分析对上述流程分别进行了参数优化。结果表明,与乙二醇萃取精馏工艺相比,使用低共熔溶剂DES1不能有效降低能耗和费用;低共熔溶剂DES2用量降低52.5%,能耗降低81.9%,操作费用降低12%,年度总费用(TAC)降低53.8%;采用隔壁塔萃取精馏工艺后,一定程度上都能节能减耗。DES2作为萃取剂的萃取精馏工艺为最优工艺,节能优势明显。
Through designing extractive distillation column and extractive dividing wall column,the separation of acetonitrile-water azeotrope system is simulated with choline chloride/ethylene glycol(a molar ratio of 1∶2),choline chloride/glycolic acid(a molar ratio of 1∶3)and ethylene glycol as extraction agent,respectively.Both choline chloride/ethylene glycol and choline chloride/glycolic acid belong to low transition temperature mixtures(LTTMs).Sensitivity analysis is employed to optimize the operation parameters of the extractive distillation processes.The results show that compared with the process using ethylene glycol as extraction agent,the process using choline chloride/ethylene glycol has no advantage in energy consumption and cost;the process using choline chloride/glycolic acid can save consumption of extraction agent by 52.5%,decline energy consumption by 81.9%,decrease operation cost by 12%,and cut down total annual cost by 53.8%.The results also indicate that the extractive dividing wall column has advantage in energy conservation compared with extractive distillation column.The process using choline chloride/glycolic acid(1∶3)as extraction agent is the optimal one.
作者
李成帅
姚媛媛
刘博文
张会敏
LI Cheng-shuai;YAO Yuan-yuan;LIU Bo-wen;ZHANG Hui-min(School of Chemical Engineering,Shengli College,China University of Petroleum,Dongying 257061,China)
出处
《现代化工》
CAS
CSCD
北大核心
2020年第3期199-202,207,共5页
Modern Chemical Industry
基金
中国石油大学胜利学院大学生创新实验项目(2019017).
关键词
低共熔溶剂
萃取精馏
乙腈
ASPEN
模拟
low transition temperature mixtures
extractive distillation
acetonitrile
Aspen
simulation
