ZENG Shaojuan, TIAN Xiao, DONG Haifeng, et al. Selection and separation performance of ionic liquid as additive in butadiene extraction with ACN[J]. CIESC Journal, 2014, (6): 2120-2129.
ZENG Shaojuan, TIAN Xiao, DONG Haifeng, et al. Selection and separation performance of ionic liquid as additive in butadiene extraction with ACN[J]. CIESC Journal, 2014, (6): 2120-2129.DOI: 10.3969/j.issn.0438-1157.2014.06.024.
A new separation process of C4 mixture with ionic liquid as additive was proposed. The influence of ionic liquid on the relative volatility of C4 mixtures in acetonitrile (ACN) solvent system was investigated. The interaction mechanisms between ACN
ionic liquid and C4 were analyzed by quantum chemistry calculations. In addition
two flowsheets of ACN butadiene extraction process with or without ionic liquid were simulated. Ionic liquids were proved to be effective additives for C4 separation
and the appropriate ionic liquid [Emim][PF6] for ACN butadiene extraction process was chosen and confirmed by the simulation results. In the practical process
the mixed solvent of ACN with ionic liquids showed better separation performance than that of ACN solvent
and the new technology could recover more than 98%(mass) ionic liquids after the distillation process. Moreover
separating C4 with ionic liquid could decrease energy consumption by about 24%. Therefore
the proposed new process technology with ionic liquid as additive is a perspective C4 mixture separation process.