[Bmim][PF_6]-丁酮肟-水-硫酸铵体系液液平衡的研究  

Liquid-Liquid Equilibrium of [Bmim][PF_6]-Butanone Oxime-Water- Ammonium Sulfate Systems

作　　者：张宸[1] 陈巧丽[1] 吴可君[1] 何潮洪[1] 

机构地区：[1]浙江大学化学工程与生物工程学院,浙江杭州310027

出　　处：《高校化学工程学报》2015年第6期1313-1319,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(21176206;21306167)

摘　　要：酮胺法生产丁酮肟过程中会副产含有丁酮肟的硫酸铵水溶液,需采用合适的溶剂来萃取回收其中的丁酮肟。作为可替代传统有机溶剂的"绿色溶剂",离子液体在萃取分离领域显现出良好的应用前景。测定了疏水性离子液体[Bmim][PF_6]-水-硫酸铵、[Bmim][PF6]-丁酮肟-水和[Bmim][PF_6]-丁酮肟-水-硫酸铵体系在303.15 K时的液液平衡数据,使用Bachman方程验证了实验数据的可靠性,同时计算了丁酮肟的分配系数(D)。在此基础上,考察了萃取时间、硫酸铵浓度和丁酮肟浓度对硫酸铵水溶液中丁酮肟的萃取效果的影响。实验结果表明,萃取较快达到平衡且效果较好。硫酸铵能提高萃取效果,且硫酸铵浓度越大,萃取效果越好。最后使用Rajendran改进的Eisen-Joffe方程对所得[Bmim][PF_6]-丁酮肟-水-硫酸铵体系的液液平衡数据进行了关联计算,结果表明计算值与实验值符合较好。研究结果能为工业上利用离子液体[Bmim][PF_6]萃取硫酸铵水溶液中的低浓度丁酮肟提供一定的参考。Ammonium sulfate aqueous solutions containing butanone oxime are usually produced as a by-product in butanone oxime synthesis, and it is necessary to find appropriate solvents to extract and recycle butanone oxime from the solution. ILs as ＂green solvents＂ are considered as the most promising alternatives to conventional organic solvents, which show good prospect in separation applications. Liquid-liquid equilibrium（LLE） data of hydrophobic ionic liquid [Bmim][PF6]-water-ammonium sulfate, [Bmim][PF6]-butanone oxime-water and [Bmim][PF6]-butanone oxime-water-ammonium sulfate systems were determined at 303.15 K, and the Bachman equation was used to examine the consistency of the experimental data, and the distribution coefficient（D） of butanone oxime was calculated. Moreover, the influence of extraction time and the concentrations of ammonium sulfate and butanone oxime in the initial aqueous solutions on extraction were investigated. Experimental results show that extraction equilibrium is reached quickly with good extraction efficiency. Higher concentration of ammonium sulfate would result in better extraction efficiency. Moreover, the experimental LLE data of [Bmim][PF6]-butanone oxime-water-ammonium sulfate are correlated with a Rajendran adjusted Eisen-Joffe equation, and the calculated values are in good agreement with the experimental values. These results help the industrial application of [Bmim][PF6] on extracting low concentration butanone oxime from ammonium sulfate aqueous solutions.

关 键 词：[Bmim][PF6] 液液平衡 丁酮肟 硫酸铵 

分 类 号：TQ028.32[化学工程]