盐析萃取结合隔壁塔分离多元醇-水混合体系  

Separation of alcohols-water system with combined process of saline extraction and dividing wall column

作　　者：胡雨奇[1] 方静[1] 李春利[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《化学工程》2015年第4期21-25,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(21306036)

摘　　要：实验考察了当采用盐析萃取分离乙醇-正丙醇-异丁醇-水的混合体系时,改性萃取剂种类、质量比对各元醇、水的分配系数、各元醇的萃取率以及萃取相质量分数的影响。实验结果表明:改性萃取剂的萃取效果优于未改性萃取剂,改性萃取剂中盐的最佳比例只与含水量(质量分数)有关,盐析萃取效果最好的改性萃取剂为环己烷-醋酸钾,环己烷与原料的适宜质量比为0.75—1.5,醋酸钾与原料的最佳质量比为0.1。在实验基础上,采用Aspen Plus软件对盐析萃取结合隔壁塔工艺进行模拟,模拟结果表明:采用该工艺流程可得到纯度为95.78%的乙醇产品,99.00%的正丙醇产品和97.00%的异丁醇产品。To separate ethanol, n-propanol and isobutanol from alcohols-water system, the experiments were conducted to indicate the influence of variables on the distribution coefficients of alcohols and water, extraction rate and extraction phase content, including different combinations of extracting agents and salt, mass ratios of salt to feed and extracting agent to feed. The experimental results show that modified extracting agent has better extractive effect than extracting agent, the optimum mass ratio of salt to feed relates only to the water content, cyclohexane- potassium acetate has the best extractive effect, the optimum mass ratio of cyclohexane to feed ranges from 0.75 to 1.5, and the optimum mass ratio of potassium acetate to feed is 0.1. Based on the experiments, the combined process of saline extraction and dividing wall column was simulated by Aspen Plus, and the results show that the product purity of ethanol, n-propanol and isobutanol can reach 95.78%, 99.00% and 97.00%.

关 键 词：盐析萃取 隔壁塔 工艺流程 

分 类 号：TQ028.32[化学工程]