酰胺复配萃取剂促进链/环烷烃分离的性能研究  

Performance of amide compound extractant to promote the separation of chain/cycloalkanes

作　　者：杭钱程 胡松 孙宇航 丁延 叶青[1] 李进龙 HANG Qiancheng;HU Song;SUN Yuhang;DING Yan;YE Qing;LI Jinong(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,Jiangsu,China;China Chemical Technology Research Institute,Beijing 102402,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]中化学科学技术研究有限公司,北京102402

出　　处：《化工学报》2024年第12期4596-4605,共10页CIESC Journal

基　　金：国家自然科学基金项目(22078026,22178030,21878025)。

摘　　要：以N,N-二甲基甲酰胺(DMF)和N,N-二甲基乙酰胺为主溶剂(DMAC)、环糊精(CD)为助剂,复配获得萃取剂DMF+CD(DMFM)和DMAC+CD(DMCM),同时以正己烷和环己烷模拟链/环烷烃混合物,实验测定了常压和283.15~303.15K下正己烷+环己烷+DMFM和+DMCM液液相平衡(LLE)数据。借助分配系数和选择性,评价了两种复配萃取剂对链/环烷烃混合物的分离效果,并进一步实验测定了复配溶剂的黏度以考察其流动性。结果表明:复配萃取剂对环己烷的选择性随萃取剂中CD含量增加而增加,且选择性DMFM<DMCM,分配系数DMFM<DMCM;复配萃取剂的黏度同样随CD含量增加而增大,且DMCM>DMFM;实验LLE和混合物黏度数据分别由NRTL和VTF模型进行关联,获得了新的模型参数。研究结果可为石脑油中链/环烷烃分离及过程设计提供基础数据及理论支撑。N,N-dimethylformamide(DMF)and N,N-dimethylacetamide(DMAC)were used as the main solvents,and cyclodextrin(CD)was used as the additives to obtain the extractant DMF+CD(DMFM)and DMAC+CD(DMCM).At the same time,n-hexane and cyclohexane were used to represent the chain/cycloalkane mixture.The liquid-liquid equilibrium(LLE)data of n-hexane+cyclohexane+DMFM and+DMCM were measured within the temperature from 283.15 K to 303.15 K under atmospheric pressure.With the help of distribution coefficient and selectivity,the separation performance of two mixed extractants on the mixture of chain/cycloalkane was evaluated,and the viscosity of the mixed solvent was further measured to investigate its fluidity.The results showed that the selectivity of the mixed extractant for cyclohexane increased with the increase of CD content in the extractant,and the selectivity DMFM<DMCM and the distribution coefficient DMFM<DMFM.The viscosity of the compound extractant also increases with the increase of CD content,and DMCM>DMFM.The experimental LLE and viscosity data were satisfactorily correlated by NRTL and VTF models,respectively,and new model parameters were obtained.The results can provide basic data and theoretical support for the separation process design of chain/cycloalkane in naphtha.

关 键 词：环烷烃 链烷烃 复配萃取剂 环糊精 液液平衡 

分 类 号：TE65[石油与天然气工程—油气加工工程]