优化设计多效变压精馏分离甲酸-水体系  

Optimal design of multi-effect pressure-swing distillation for separating of formic acid-water system

作　　者：刘金贵 王爱兵 王红[1] 申威峰[1] 魏顺安[1] LIU Jin-gui;WANG Ai-bing;WANG Hong;SHEN Wei-feng;WEI Shun-an(School of Chemistry and Chemical Engineering,Chongqing 400044,China)

机构地区：[1]重庆大学化学化工学院,重庆400044

出　　处：《化学工程》2021年第2期24-29,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21878028);中央高校重点资助项目(2019CDQYHG021)。

摘　　要：甲酸(FA)作为重要的化工产品之一,广泛用于农药、皮革、染料、医药和橡胶等工业。当前FA废水处理问题已成为普遍的工业难题,而公开文献中尚未有关于多效变压精馏(ME-PSD)对FA和水的分离的报道。基于两塔变压精馏(DC-PSD)工艺,提出了三塔变压精馏(TC-PSD)分离技术来回收FA溶液。通过AspenPlus软件搭建稳态模型,采用序列迭代优化方法,以TAC为目标函数对TC-PSD进行优化设计。结合TC-PSD工艺过程中塔的温位和热负荷分析,设计了三塔多效变压精馏(TC-ME-PSD)工艺。结果表明:TC-ME-PSD工艺TAC从2.753×10^(7)元/a下降至1.670×10^(7)元/a,与两塔多效变压精馏过程(DC-ME-PSD)相比每年可以节约27.39%的蒸汽消耗和19.17%的TAC。TC-ME-PSD工艺是FA回收的有效集成强化手段。Formic acid(FA)is frequently used as important chemical products in pesticides,leather,dyes,medicine and rubber.Currently,FA wastewater treatment has become a common industrial problem,and fewer efforts have been reported for separating formic acid and water by multi-effect pressure swing distillation(ME-PSD).Based on double-column PSD scheme,a three-column PSD(TC-PSD)process was proposed to recover FA.The steady-state process of the three-column PSD was carried out through the AspenPlus simulator.These quential iterative optimization method was used to optimize the three-column PSD process with total annual cost(TAC)as the objective function.Combined with the temperature level and heat duty analysis of three columns PSD scheme,a three-column multi-effect PSD(TC-ME-PSD)process was proposed.The results show that the TAC of TC-ME-PSD process decreases from 2.753×10^(7)Yuan/a year to 1.670×10^(7)Yuan/a year,which can save 27.39%steam consumption and 19.17%TAC per year compared with DC-ME-PSD process.TC-ME-PSD technology is an effective process intensification method for FA recovery.

关 键 词：多效变压精馏 共沸 优化设计 分离 AspenPlus流程模拟 

分 类 号：TQ028.8[化学工程]