N-甲基吡咯烷酮萃取精馏分离乙腈-正丙醇物系工艺条件的优化.pdf

石油化
958
PETROCHEMICAL TECHNOLOGY
2015年第44卷第8期
N-甲基叱咯烷酮萃取精馏分离乙腈
正丙醇物系工艺条件的优化
周召方
(中韩(武汉)石油化工有限公司,湖北武汉,430082)
摘要丁采用N-甲基吡咯烷酮(NMP)为萃取剂,对乙腈ー正丙醇物系进行萃取精馏实验。采用 Aspen Plus化工流程模拟软件
以改进的 UNIFAC模型计算物性数据,对NMP法萃取精馏工艺进行模拟,考察理论塔板数、溶剂比(NMP与原料的质量比
回流比等条件对分离效果的影响。萃取精馏塔的模拟结果与实验结果的偏差小于7.5%;模拟得到NMP法萃取精馏分离乙腈
正丙醇物系的优化工艺条件:萃取精馏塔的理论塔板数为35块、溶剂比为1.2、回流比为1.6,再生塔的理论塔板数为18块、
回流比为1.5。在此条件下,乙脂产品中乙腈含量为996%(w),回收率为99%;正丙醇产品中正丙醇含量为998%(w),回
收率为98.89%。
关键词」N-甲基吡咯烷雨;乙腈;正丙醇;萃取精馏;分离
文章编号]1000~8144(2015)08-0958-05
中图分类号1TQ028
[文献标志码]A
Optimization of Process Conditions for Separating Acetonitrile- -Propanol System
by NMIP Extractive Distillation
OL∠ baofan
(SINOPEC-SK( Wuhan Petrochemical Company Limited, Wuhan Hubei 43008, China
Abstract The extractive distillation of acetonitrile-n-propanol system was conducted with
N-methylpyrrolidone(NMP)as the extraction solvent. The process was simulated by means of the
Aspen Plus chemical process simulation software and the physicochemical data of the system wer
calculated by the modified UNIFAC model. The influences of theoretical plate number, solvent ratio
and reflux ratio on the separation were investigated. All the relative errors between the experimental
data and simulation results were less than 7.5%. The separation process of the acetonitrile-n-propanol
system with the NMP extraction agent was optimized. Under the optimal process conditions: for the
extractive distillation column, theoretical plate number 35, solvent ratio 1.2 and reflux ratio 1.6, and
for the recovery column, theoretical plate number 18 and reflux ratio 1.5, the acetonitrile content in
the acetonitrile product was 99. 7%(w)and its recovery rate was 99.96%; and the n-propanol content in
the n-propanol product was 99.8%(w)and its recovery rate was 98. 89%o(w)
Keywords] N-methylpyrrolidone; acetonitrile; n-propanol; extractive distillation
separation
乙腈和正丙醇是精细化工和制药行业中广泛97.1℃)能形成氢键,在80℃下形成最低共沸物,
应用的溶剂,在工业生产中会有大量的乙腈和正丙共沸物中乙腈的含量为72.5%(w)。因此采用普通
醇的混合废液,对其分离回收具有重要的经济效益精馏法很难从乙腈和正丙崞的混合液中分离出高纯
和环境效益
度的乙腈。何玉平等采用加盐萃取精馏法分离乙
常压下,乙腈(沸点81.6℃)与正丙醇(沸点腈和正丙醇的混合物,分离效果较好,但盐的回收
[收稿日期]2015-03-04;[修改稿日期」2015-05-05。
作者筒介]周召方(1981ー-),男,湖北省武汉市人,大学,电话027-8663235,电邮zhouzf.whsh(sinopec.com。