DWC分离三组分混合物的研究  

Study of using DWC to separate three components mixture

作　　者：钱春健[1] 叶青[1] 朱国彪[1] 裘兆蓉[1] 

机构地区：[1]江苏工业学院化工系江苏省精细石油化工重点实验室,江苏常州213016

出　　处：《化工进展》2007年第8期1174-1177,1194,共5页Chemical Industry and Engineering Progress

基　　金：江苏省自然科学基金资助项目(BK2004035);江苏省高校自然科学基金资助项目(05KBJ530025)

摘　　要：为研究分隔壁塔在分离三组分混合物时的分离特性,采用自制小试装置,以乙醇/正丁醇/正己醇三组分混合物为例,考察进料组成、进料速度、回流比、分配比等因素对分离效果的影响,得出DWC的最佳操作条件;并通过计算,进行DWC和常规二塔流程在分离以上三组分混合物的能耗比较。结果表明,当进料中正丁醇体积分数为60%、乙醇和正己醇的体积分数相当,进料速度1.8 mL/min,分配比1∶2,回流比5∶1时,DWC的分离效果最佳,塔顶采出乙醇的质量分数在96%以上,侧线采出正丁醇的质量分数在98%以上,塔釜中无乙醇;DWC与常规二塔流程相比具有明显的节能效果,冷凝器和再沸器的热负荷分别降低27.2%和23.9%以上。A laboratory scale dividing wall column （DWC） was built for separating a mixture consisting of ethanol/n-butanol/hexanol in order to study the characteristics of the DWC. The influences of feed volume ratio, feed flow rate, reflux ratio and distribution ratio on separation result were investigated. Through calculation, the energy consumption of separating the above mixture was compared between DWC and conventional two distillation column process. When the volume ratio of n-butanol in the feed was 60% and the content of ethanol was equal to hexanol, feed flow rate was 1.8 mL/min, distribution ratio was 1 ： 2, reflux ratio was 5 ： 1, the result was the best, the mass fraction of ethanol could reach more than 96% in the overhead product, the mass fraction of n-butyl alcohol could reach more than 98% in the side-draw product, and the bottom of column had no ethanol. Compared with the conventional two distillation column process, DWC required less energy, the energy consumption of condenser and reboiler could be reduced by more than 27.2% and 23.9% respectively.

关 键 词：分隔壁塔 精馏 节能 

分 类 号：TQ028.31[化学工程]