加盐萃取精馏法制备无水乙醇  

Preparation of Anhydrous Ethanol by Salt Extraction Distillation

作　　者：杜友兴 DU You-xing(Research and Development Department, Shanghai Weier Chemical Technology Co., Ltd., Shanghai 200331, China)

机构地区：[1]上海威耳化工科技有限公司研发部,上海200331

出　　处：《西安职业技术学院学报》2019年第2期54-57,70,共5页Research on Vocational Education in Xi'an Vocational and Technical College

摘　　要：为了将制药废液中回收的乙醇制备无水乙醇,研究了加盐萃取精馏技术在分离乙醇-水体系中的应用,选择了加盐萃取精馏所用溶盐,考察了溶剂含盐量、溶剂比和回流比以及溶剂和粗品乙醇流速等因素对塔顶乙醇含量的影响.结果表明,以乙二醇-醋酸钾体系作为溶剂,当溶剂含盐量为10g/100g,溶剂比为1.2,回流比为1.2,溶剂流速为1.0mL/min,含水乙醇的流速为1.2mL/min时,可以从塔顶得到质量分数大于99.5%的无水乙醇.In order to prepare anhydrous ethanol from ethanol recovered from pharmaceutical waste liquid, the application of salt extraction and rectification technology in the separation of ethanol-water system was studied. The dissolved salt used in salt extraction and rectification was selected, and the salt content of the solvent was investigated. The effect of solvent ratio and reflux ratio, as well as solvent and crude ethanol flow rate on the ethanol content at the top of the column. The results showed that the ethylene glycol-potassium acetate system was used as the solvent. When the solvent content was 10 g/100 g, the solvent ratio was 1.2, the reflux ratio was 1.2, the solvent flow rate was 1.0 mL/min, and the flow rate of the aqueous ethanol was 1.2 mL. At /min, anhydrous ethanol having a mass fraction greater than 99.5% can be obtained from the top of the column.

关 键 词：萃取精馏 加盐萃取精馏 制药废液 无水乙醇 

分 类 号：TQ028[化学工程]