2,3-丁二醇萃取-精馏耦合工艺开发研究  

Development and study on extraction coupled distillation technology for 2,3-butanediol separation

作　　者：吴艳阳[1] 朱家文[1] 陈葵[1] 武斌[1] 沈亚领[2] 

机构地区：[1]华东理工大学化工分离研究所,上海200237 [2]华东理工大学生物反应器工程国家重点实验室,上海200237

出　　处：《化学工程》2011年第8期90-94,102,共6页Chemical Engineering(China)

基　　金：国家"863"计划项目(2006AA02Z23)

摘　　要：在前期液-液相平衡研究的基础上,得出正丁醇、乙酸乙酯及乙酸丁酯在萃取2,3-丁二醇时的不同特点。并根据其特点,分别设计了2条创新的间歇-循环的萃取-精馏耦合工艺。根据乙酸乙酯、乙酸丁酯分配系数小、相比(质量比)要求较大的特点,设计萃取-精馏耦合工艺一(即溶剂循环、料液间歇进料),该工艺具有相比逐渐增大、溶剂循环萃取的特点;根据正丁醇分相区小、可调相比范围较小的特点,设计了萃取-精馏耦合工艺二(即溶剂与精馏后水相连续循环、料液间歇进料),该工艺具有相比不变、溶剂循环萃取的特点。以2,3-丁二醇萃取率及溶剂损失率为指标,对2条萃取工艺进行考察,得出相应的可行工艺条件。在此条件下,2,3-丁二醇的萃取率均可大于90%,从而有效地解决了3种溶剂采用常规萃取工艺均无法很好地实现提取2,3-丁二醇的难题。The characteristics of three solvents including n-butanol, ethyl acetate and butyl acetate were confirmed on the basis of the liquid-liquid equilibrium data of prior-phase lab experimental study. According to the characteristics, two innovative batch-continuous extraction technological routines were designed and studied, respectively. When ethyl acetate or butyl small and big phase ratio （mass ratio ） acetate is taken as extraction solvent, the distribution coefficients are is necessary to satisfy 2,3-butanediol extraction. The corresponding extraction coupled distillation technology No. 1 （solvent is continuous and feed is discontinuous） is designed. This technology has the characteristics of gradually increasing phase ratio and continuous extraction. When n-butanol is taken as extraction solvent, the heterogeneous zone and the range of practical phase ratio are small. And the corresponding extraction coupled distillation technology No. 2 （solvent and aqueous phase after rectification are continuous and feed is discontinuous） is designed. This technology has the characteristics of fixed phase ratio and continuous extraction. With the targets of both 2, 3-butanediol extraction rate and solvent loss rate, the corresponding appropriate technological conditions were studied and obtained, under which 2, 3-butanediol extraction rate can be above 90%, thus solving effectively the problem that the three solvents of n-butanol, ethyl acetate and butyl acetate can hardly extract 2,3-butanediol with common methods.

关 键 词：2 3-丁二醇 萃取 精馏 

分 类 号：TQ223.162[化学工程—有机化工]