萃取精馏分离苯乙酮与α-苯乙醇的模拟研究  

Simulation of acetophenone and α-phenylethanol separation by extractive distillation

作　　者：章锋[1] 王成习[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《化学工程》2013年第4期74-78,共5页Chemical Engineering(China)

摘　　要：苯乙酮与α-苯乙醇属近沸点物系,用普通精馏方法很难将二者进行有效地分离。在对已报道的分离方法进行比较分析的基础上,提出了采用萃取精馏方法来分离苯乙酮和α-苯乙醇。文中首先通过定性判断和基团贡献法定量地估算选择了该二元物系合适的萃取剂为丙三醇。然后采用Aspen Plus化工模拟软件中的RadFrac模块进行了萃取精馏塔的模拟,分别考察了溶剂与原料进料位置、回流比、溶剂比对分离效果的影响。结果表明:对于处理量为1 000 kg/h的待分离物系,操作压力为5 kPa,在塔板数为30的条件下萃取精馏塔在原料进料位置为第19块塔板,溶剂进料位置为第6块塔板,回流比为3∶1(质量比),溶剂流率为800 kg/h的优化条件下,可以使塔顶苯乙酮质量分数达到99.8%,且塔釜几乎不含苯乙酮。模拟结果对进一步的实验研究和工业生产具有一定的指导意义。Acetophenone and α-phenylethanol are close-boiling mixture which can not be efficiently separated by normal distillation methods. On the basis of comparison and analysis of the separation methods reported, the extractive distillation method was proposed to separate acetophenone and α-phenylethanol. First, glycerol was chosen as the suitable solvent for the binary system through qualitative judgment and quantitative estimation by group contribution method. Then the influences of continuous extractive distillation process parameters, such as feed stage, solvent feed stage, reflux ratio and solvent mass ratio in extractive distillation column on separation were investigated by using RadFrac module of Aspen Plus software. The results show that the optimum operation parameters are as follows： the stages of feed and solvent feed are 19th and 6th respectively, reflux ratio （mass ratio） is 3 ： 1, solvent flowrate is 800 kg/h when the flowrate of mixtures to be separated is 1 000 kg,/h in a 30- stage column at 5 kPa. Under these optimized conditions,the mass fraction of acetophenone at the top reaches 99. 8% and there is almost no acetophenone at the bottom. The simulation result provides the fundamental guide for the coming experimental study and industrial production.

关 键 词：苯乙酮 Α-苯乙醇 萃取精馏 模拟研究 

分 类 号：TQ028[化学工程]