聚乙烯醇生产中回收工段第三、第四精馏塔的模拟与优化  

Simulation and optimization of the third and fourth distillation columns in the recovery section of polyvinyl alcohol production

作　　者：李梦圆 郭凡 李群生[1] LI Mengyuan;GUO Fan;LI Qunsheng(College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Zhejiang Huayi Engineering Design Co.,Ltd.,Shaoxing 312300,Zhejiang,China)

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]浙江华亿工程设计股份有限公司,浙江绍兴312300

出　　处：《化工进展》2023年第S01期113-123,共11页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(22008004);极大规模集成电路制造装备专用射频电源研发及产业化(2019ZT08Z458);科技部揭榜挂帅项目“纤维素乙醇负碳炼制关键技术研发”。

摘　　要：聚乙烯醇(PVA)是一种性能优良的聚合物材料,其回收工段的主要目的是对上游产生的富含醋酸甲酯(MeOAC)、甲醇(MeOH)等化工原料的醇解废液进行回收处理。其中回收工段第三精馏塔和第四精馏塔(以下简称TQ-603和TQ-604)主要分离任务是同时处理来自回收二塔TQ-602的塔釜液、来自回收一塔TQ-601的塔釜液及聚合工段第三精馏塔TQ-302的塔釜液,其物料的主要组成均为甲醇与水的混合物。本文采用Aspen Plus化工流程模拟软件对10万吨/年PVA回收工段中回收三塔和四塔进行模拟优化,针对所分离的主要体系MeOH-H_(2)O体系进行了热力学方法的选择及参数回归,最终选用NRTL模型进行了模拟与优化。优化后得到单塔的最佳操作参数。在此基础上将双效精馏技术用于原工艺流程的节能改造并开展模拟优化,构建多塔供热流程,实现深度节能。Polyvinyl alcohol(PVA)is a polymer material with excellent performance.The main purpose of the recycling section is to recycle the alcoholysis waste liquor rich in methyl acetate(MeOAC),methanol(MeOH)and other chemical materials generated upstream.The main separation task of the third and fourth distillation columns of the recycling section(TQ-603 and TQ-604)is to simultaneously process the column kettle liquor from the second column(TQ-602),the column kettle liquor from the first column(TQ-601)and the column kettle liquor from the third column of the polymerization section TQ-302.Their main composition is a mixture of methanol and water.In this article,Aspen Plus chemical process simulation software was used to simulate and optimize the 100kt/a PVA recovery section in the third and fourth towers.The thermodynamic method was selected,and the parameter regression was conducted for the main MeOH-H_(2)O system.The optimal operating parameters of the single tower were obtained after optimization.On this basis,the double-effect distillation technology was implemented for the energy-saving renovation of the original process.A multi-tower heating process was developed through simulation and optimization to achieve deep energy saving.

关 键 词：聚乙烯醇 回收塔 双效精馏 模拟 优化 

分 类 号：TH3[机械工程—机械制造及自动化]