萃取精馏分离二氯甲烷-丙酮的工艺模拟  

EXTRACTIVE DISTILLATION PROCESS SIMULATION FOR SEPARATION OF DICHLOROMETHANE AND ACETONE

作　　者：王震[1] 高晓冲[1] 夏庆宁[1] 高瑞昶[1] 

机构地区：[1]天津大学化工学院,生物制药实验中心,天津300072

出　　处：《精细石油化工》2012年第4期54-57,共4页Speciality Petrochemicals

摘　　要：以水为萃取剂对二氯甲烷-丙酮混合物进行了萃取精馏过程模拟,体系的气-液平衡和液-液平衡分别采用Wilson模型和NRTL模型预测。分析了总理论板数,回流比,萃取剂进料速率、塔板数、温度和原料进料塔板数、温度等操作参数对精馏过程的影响。并取得了最佳工艺参数为:萃取塔采用36块理论板,回流比为3,原料在第16块板进料,萃取剂用量1 500kg/h,第7块板进料时塔顶得到二氯甲烷-水的共沸物,分层得99.9%的二氯甲烷,塔釜得到丙酮-水的混合物进入丙酮塔;丙酮塔为简单精馏塔,采用35块理论板,回流比为4,第25块板进料,塔顶可得99.7%的丙酮,塔釜得到几乎纯净的水,经冷却后可用作萃取塔的萃取水,循环套用。Dichloromethane and acetone can form the conventional distillation. Extractive distillation for highest azeotrope, so it can not be separated by separation of dichloromethane and acetone was simulated by computer. Wilson model and NRTL model were used for predicting VLE and LLE. The influence of operation factors such as stage number, reflux ratio, extractant feed rate, location, tem- perature and material feed location, temperature were analyzed. The optimal parameters of column were proposed, the theoretical total plate number of extraction column is 36, the reflux ratio is 3, the raw material is fed at 16th plate, the extractant is fed at 7th plate and the feed rate is 1 500 kg/h. Di- chloromethane-water azeotrope was obtained at the top of the extraction column. The dichloromethane layer was 99.9%. Acetone-water mixture which was obtained at the bottom of extraction column was put into the acetone column, the theoretical total plate number of acetone column is 35, the reflux ra- tio is 4, and the raw material is fed at 25th plate. A top product of acetone with 99.7%concentration and a bottom product of almost pure water which can be recycled as extraction water after cooling could be obtained. These results are useful for construction design and improvement.

关 键 词：二氯甲烷 丙酮 萃取精馏 模拟计算 

分 类 号：TQ028.32[化学工程]