丙酮-氯仿混合物萃取精馏分离过程模拟  

Simulation of Extractive Distillation Separation Process for Acetone- chloroform Mixture

作　　者：李丽[1] 

机构地区：[1]安徽理工大学学术出版中心,安徽淮南232001

出　　处：《安徽理工大学学报（自然科学版）》2015年第4期77-80,共4页Journal of Anhui University of Science and Technology:Natural Science

摘　　要：为增大关键组分的相对挥发度以有利于分离,用苯作为溶剂对流量为78.788 88 kmol/h的丙酮-氯仿混合物进行萃取精馏过程的模拟计算。精馏流程采用两塔结构,即萃取精馏塔和溶剂回收塔,前者塔顶馏出产物为丙酮,塔底产物为氯仿、苯和微量丙酮的混合物;后者塔顶馏出产物为氯仿,塔底为溶剂苯和少量氯仿,此塔底产物作为回流与补充溶剂合并返回萃取精馏塔。萃取精馏塔总共65块理论板(包括塔顶全凝器和塔底再沸器),补充溶剂(0.410 76kmol/h)和新鲜进料合并从萃取塔第30块理论板加入(从上往下数),回流比为10,塔顶产物42.84kmol/h;溶剂回收塔共有70块理论板(包括塔顶全凝器和塔底再沸器),进料位置为第30块,回流比为15,塔顶产物与进料流量比设为0.11。模拟计算结果收敛,结果萃取精馏塔顶产物中丙酮纯度为99.95%,溶剂回收塔顶氯仿含量达到97.87%。In order to increase the relative volatility of the key components and be in favor of their separation, the simulation calculation was conducted for extractive process of acetone - chloroform mixture stream with flow rate of 78. 788 88 kmol/h using benzene as solvent. The entire separation process is composed of two columns, i. e, an extractive column and a solvent recovery column. The distillates in the top and bottom product of the former are acetone and a mixture of chloroform, benzene and trace of acetone, respectively. The distillates in the top and bottom product of the latter are chloroform and a mixture of benzene with trace of chloroform, respectively. The bottom product of the latter column is recycled to the former column with the makeup solvent. The extractive column contains 65 theoretical stages. The makeup solvent（0.410 76 kmol/h）and the fresh feed mixture enters the extractive column at the 30th theoretical tray. The reflux ratio of the extractive column is set at 10 the distill- ate flow rate is set at 42.84kmol/h. The solvent recovery tower is simple distillation tower containing 70 theoreti- cal stages. The feed location is also the 30th theoretical tray, while the reflux ratio is set at 15and the distillate to feed ratio is set at 0.11. The simulation converged and the purity of acetone product from the top of extractive column is 99.95% and the purity of chloroform from the solvent recovery column reaches 97.87%.

关 键 词：丙酮 氯仿 苯 萃取精馏 模拟 

分 类 号：TQ028[化学工程]