非均相共沸精馏法分离2-氯乙醇-水.pdf

第45卷第4期
化学
程
Vol 45 No 4
2017年4月
CHEMICAL ENGINEERING(CHINA)
Apr.2017
非均相共沸精馏法分离2-氯乙醇-水
少辉,毕丽媛
(青岛科技大学化工学院,山东青岛266042)
摘要:以环己烷、甲翠和1,2-二氯乙烷为候选共沸剂,采用非均相共沸精馏法从2-氯乙醇/水共沸物中分离出高浓
度2-氯乙醇产品。通过ASPF、物性分析功能研究了不同共沸剂与2-氯乙醇/水体系形成共沸物的情况,并根据二
元相图进行了过程的念设计。在此基础上,通过 ASPEN模拟和优化了采用不同共沸剂的分离过程的工艺祭件
并以年度总费用最小为依据选择了甲苯为共沸剂,此时最优工艺条件为:共沸塔总理论板数为20块塔板,进料位
置在第8块塔板,回流比为2;脱水塔总理论板数为30块塔板,进料位置在第20块塔板,回流比为1.5。在此工艺
条件基础上进行了实验,结東表明2-乙崞产品纯度可达到99%以上,且回收率在93.5%,实验结果与模拟结果
能较好吻合,文中的研究可为2-氯乙醇-水分离的工业化提供参考
关键词:非均相共沸精馏;2-氯乙醇;过程模拟
中图分类号:1Q021文献标识码:A文章编号:1005-9954(2017)4-002504
DOI:10.3969/.i38n.1(05-9954.2017.04.06
Separation of 2-ethylene chlorohydrin and
water via heterogeneous azeotropic distillation
TAO Shao-hui, BI Li-yuan
College of Chemical Engineering, Qingdao University of Science and Technology
Qingdao 266042, Shandong Province, China)
Abstract: To obtain high purity 2-ethylene chlorohydrin from its azeotrope with water via heterogeneous azeotropic
distillation, cyclone hexane, toluene and 1, 2-dichloroethane were taken as candidate azotropic agents. The
property analysis function of ASPEN was used to analyze the azeotropes formed by the candidate agents, 2-ethylene
drin and water, and the conceptual separation process was designed via the ternary diagram. Then the
separation process with different azeotropic agent was simulated and optimized with ASPEN, and toluene was
selected as the azeotropic agent because of its total annual cost is minimal with the optimal process condition
20 theoretical stages for the azeotropic column and the feed stage is 8 and reflux ratio is 2; 30 theoretical stage for
the dehydrating column whose feed stage is 20 and reflux ratio is 1. 5. At last the experiments were carried out
based on the process condition the result shows that the mass purity of 2-ethylene chlorohydrin product is not less
lan 99%, the mean rccovery ratc is 93,5%, and the simulation resull is reliable. The work of this paper provides
*t uidance for the industrialization of the separation of 2-ylert chluruhydrin-watel
:y words; heterogeneous azeotropic distillation; 2-ethylene chlorohydrin; process simulation
2-氯乙醇(以下简称氯乙醇)是重要的有机溶生成氯乙醇。此法得到的氯乙醇浓度较低,需经过
剂和有机合成原料,是合成聚硫橡胶的重要原料,并进一步精馏オ可得到较高浓度氯乙醇产品,能耗较
」'泛用作医药、染料、农药的中间体,以及用作水处高,因而限制了此工艺的应用;②环氧乙烷-氯化
理剂和有机溶剂。日前,文献报道的氯乙醇合成方氢法,本法以坏氧乙烷与高纯氯化氢为原料,在氯化
法有:①乙烯次氯酸化法,即将乙烯和氯气同时通入镁存在下生产质量分数不低于99%的高纯度氯乙
水中,氯气与水反应生成次氯酸,次氯酸与乙烯加成醇,该工艺流程短,产品纯度高,污染小,但氯化氢提
收稿日期:2016-07-2
基金项目:国家自然科学青年基金资功项?(5150610
作者简介:陶少辉(1978-),男,博土,讲师,从事过程系统工程方面的研究、电话:13869895813,E-mail:lu心 qust.etdu.cna
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