量子点废液轻组分的资源化利用  

Reutilization of light components in quantum dot waste liquid

作　　者：李云[1] 张竞予 陈金芳[1] LI Yun;ZHANG Jing-yu;CHEN Jin-fang(Wuhan Institute of Technology,Wuhan 430200,China)

机构地区：[1]武汉工程大学,湖北武汉430200

出　　处：《现代化工》2020年第11期182-185,189,共5页Modern Chemical Industry

摘　　要：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.

关 键 词：量子点废液 正己烷 乙醇 共沸物 萃取剂 间歇萃取精馏 

分 类 号：TQ09[化学工程]