溶液法生产量子点产品过程中会产生大量的轻组分废液，其主要成分为正己烷与乙醇的混合溶液，此二元物系常压下会形成共沸物。通过萃取精馏的方式对量子点废液轻组分进行分离，选取N，N-二甲基甲酰胺（DMF）作为萃取剂，通过气液相平衡实验和间歇萃取精馏实验证明DMF能够对正己烷-乙醇共沸物系进行有效地分离。实验结果表明，填料塔理论塔板数为13、溶剂比为1.5、回流比为3时，得到正己烷的质量分数为98%，回收率为56.4%；乙醇的质量分数为95%，回收率为74.8%。同时考察了回收溶剂再利用的可行性。

A large amount of light components-containing waste liquid will be produced in the process of producing quantum dots by solution method,which mainly composes of mixed solution of n-hexane and ethanol that will form an azeotrope at normal pressure.Light components in quantum dot waste liquid are separated through extractive distillation,with N,N-dimethylformamide (DMF) as the extractant.It is proved through gas-liquid equilibrium experiments and batch extractive distillation experiments that DMF can effective separate n-hexane-ethanol azeotrope system.Experimental results show that the mass fraction of n-hexane obtained can reach 98% with a recovery rate of 56.4%,and the mass fraction of ethanol obtained can reach 95% with a recovery rate of 74.8% when the packed column has 13 of theoretical plates,the solvent ratio is 1.5,and the reflux ratio is 3.The feasibility of reusing the recovered solvent is also verified.

李云(1994-),男,硕士研究生,研究方向为废液回收处理,742506512@qq.com