三类典型间壁式精馏塔分离给定BTX物系的效果探究  

Study on the performance of three typical dividing wall columns for a given BTX separation

作　　者：朱哲熹 王健红[1] 刘秦君 杜增智[1] 赵志建[1] 孙巍[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《计算机与应用化学》2016年第9期1023-1026,共4页Computers and Applied Chemistry

基　　金：中央高校基本科研业务费专项资金资助(ZY1511);国家自然科学基金资助项目(21506007)

摘　　要：间壁式精馏塔(DWC)利用间壁形成特殊的塔内部结构,从而实现精馏过程的节能以及过程设备的综合。在实际生产中待分离三组分原料组成、间壁安装位置将影响间壁式精馏塔的节能效果。本文以苯-甲苯-二甲苯(BTX)三组分精馏为研究对象,使用gPROMS过程模拟软件,建立基于MESH方程的三类典型间壁式精馏塔模型,研究当进料组成和产品纯度一定时,三类典型间壁安装位置的间壁式精馏塔的能量投入情况,探究间壁式精馏塔选用的一般原则。计算结果表明,对本研究体系,在进料轻组分摩尔比小于0.5时或中间组分大于0.4时亦或重组分大于0.2小于0.6时,应选用完全热耦合间壁式精馏塔;只有在轻组分较多时,选用间壁式侧线提馏塔;在重组分较多时,选用间壁式侧线精馏塔。本文对三类典型间壁式精馏塔分离不同组成原料的节能情况进行分析,可以为间壁塔的设计选用提供一定的参考。Dividing wall column （DWC） has a dividing wall forming a special internal structure, realizing the integration of equipment and energy saving. In practice, the position of dividing wall can influence the energy efficiency in different feed conditions. In this study, the separation process of Benzene-Toluene-Xylene （BTX） is studied, MESH equations are built for modeling three typical dividing wall columns and solved in gPROMS environment. The result shows that, for the studied system, feed benzene mole fraction less than 0.5 or toluene mole fraction more than 0.4 or p-xylene mole fraction between 0.2 and 0.6, a fully thermally coupled column needs the minimum energy consumption; only when feed benzene mole fraction is high, a divided wall column with side-stripper gives a better performance; and only when feed p-xylene mole fraction is high, a divided wall column with side-rectifier is more energy efficient. This result could be used as a reference for relevant design and selection of DWC.

关 键 词：热耦合精馏 间壁位置 选用原则 

分 类 号：TQ015.9[化学工程] TP391.9[自动化与计算机技术—计算机应用技术]