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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第9期    总第241期    2014年9月

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文章编号:1672-7207(2014)09-2966-06
变压精馏和萃取精馏分离乙腈和水工艺模拟及优化
余美琼1,杨金杯1,郑志功2

(1. 福建师范大学 福清分校,福建 福州,350300;
2. 中海油山东化学工程有限责任公司,山东 济南,250013
)

摘 要: 基于乙腈与水的共沸特性分析,提出变压精馏和萃取精馏分离乙腈与水的工艺方法,并对2种分离工艺可行性进行研究。利用Aspen Plus软件对2种分离工艺进行模拟并优化,以Wilson活度系数方程为物性计算方法,其二元相互参数由汽液相平衡数据回归,考察理论板数、进料位置和回流比等因素对分离的影响,得到2种分离工艺的较佳工艺参数,并进行能耗比较。研究结果表明:2种分离工艺均能较好地实现乙腈和水的分离,乙腈产品纯度均能达到 99.5%;在相同的处理量及分离要求下,萃取精馏比变压精馏节省能耗,更适合乙腈和水共沸体系的分离,为该共沸物分离的设计与改造提供了依据。

 

关键字: 乙腈;Aspen Plus软件;变压精馏;萃取精馏;节能

Simulation and optimization for separation of acetonitrile and water by pressure swing distillation and extractive distillation
YU Meiqiong1, YANG Jinbei1, ZHENG Zhigong2

1. Fuqing Branch, Fujian Normal University, Fuzhou 350300, China;
2. CNOOC Shandong Chemical Engineering Co. Ltd, Jinan 250013, China

Abstract:Pressure swing distillation and extractive distillation for separation of acetonitrile and water were investigated based on the characteristics of the azeotropic composition. The two separation processes were simulated by Aspen Plus software using the physical property model Wilson with binary parameters obtained by experimental data of vapor liquid equilibrium (VLE). The factors, such as theoretical plates, feed location and reflux ratio, that affected the separation efficiency and energy consumption were analyzed. The results show that acetonitrile and water are both efficiently separated by pressure swing distillation and extractive distillation, and the purity of acetonitrile both can reach 99.5% by these two processes. The two processes evaluated are optimized independently from each other, and the optimal conditions are obtained. For the binary system acetonitrile and water, the extractive distillation is more attractive than the pressure swing distillation because of its energy saving, which provides an effective method for the design and retrofit of separation of azeotropic system.

 

Key words: acetonitrile; Aspen Plus software; pressure swing distillation; extractive distillation; energy-saving

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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