摘要
利用Aspen Plus软件对乙腈和水的分离分别采用常规变压精馏工艺和变压热集成精馏工艺进行模拟,选用UNIQUE物性方法进行计算,以能耗最低为目标函数,满足乙腈和水的质量分数都不低于99%,对常规变压精馏和变压热集成精馏进行了分析,从而确定最佳工艺。对于常规变压精馏工艺,高压塔理论板数为14,进料板位置9,回流比1. 1;常压塔理论板数为12,进料板位置8,回流比1. 6。对于变压热集成精馏工艺,高压塔进料板位置为7,回流比为1. 17;常压塔进料板位置为8,回流比为1. 6。与常规变压精馏相比,变压热集成精馏再沸器能耗降低49. 75%,冷凝器能耗降低51. 53%,且无需增加再沸器和冷凝器。
The separation of acetonitrile-water mixture is simulated by Aspen Plus software using conventional pressure-swing distillation process and pressure-swing heat integrating distillation process,respectively. Selecting UNIQUE physical property method to calculate,taking the lowest energy consumption as the objective function and meeting the requirements that both the mass fractions of acetonitrile and water are not less than 99%,the conventional pressure-swing distillation process and the pressure-swing heat integrating distillation process are analyzed to determine the optimum process. As for the conventional pressure-swing distillation process,the number of theoretical plates,the feed plate and the reflux ratio are 14,9th plate and 1. 1,respectively in the high pressure column;and the number of theoretical plates,the feed plate and the reflux ratio are 12,8th plate and 1. 6,respectively in the atmospheric column. As for the pressure-swing heat integrating distillation process,the feed plate and the reflux ratio are 7th plate and 1. 17 respectively in the high pressure column;and the feed plate and the reflux ratio are 8th plate and 1. 6 respectively in the atmospheric column. Compared with the conventional pressure-swing distillation process,the pressure-swing heat integrating distillation process can reduce energy consumption of the reboiler by 49. 75% and energy consumption of the condenser by 51. 53%. In addition,it is not necessary to add reboiler and condenser.
作者
高晓新
王天宇
陈梦圆
李涛
杨德明
GAO Xiao-xin;WANG Tian-yu;CHEN Meng-yuan;LI Tao;YANG De-ming(School of Petrochermical Engineering,Changzhou University,Changzhou 213164,China)
出处
《现代化工》
CAS
CSCD
北大核心
2020年第5期219-222,226,共5页
Modern Chemical Industry
关键词
乙腈-水
变压精馏
变压热集成
节能
acetonitrile-water
pressure-swing distillation
pressure-swing heat integrating distillation
energy conversation
