甲醇-甲乙酮-1-辛基-3-甲基咪唑六氟磷酸盐物系等压汽液平衡数据的测定

在101.3kPa下，用改进的Othmer釜测定了含摩尔分数分别为5%、8%、10%和20%离子液体1-辛基-3-甲基咪唑六氟磷酸盐（OMIM]PF₆）的甲醇-甲乙酮-OMIM]PF₆汽液平衡数据，并采用NRTL方程进行关联。实验结果表明，当离子液体OMIM]PF₆的摩尔分数为5%时，甲醇-甲乙酮二组分物系汽液平衡线发生偏离，当离子液体OMIM]PF₆摩尔分数达到8%时，就可以消除甲醇-甲乙酮物系的共沸点；离子液体OMIM]PF₆摩尔分数越大，盐效应越明显，离子液体OMIM]PF₆可以作为甲醇-甲乙酮的萃取剂。

Vapor-liquid equilibria for the methanol-methyl ethyl ketone-1-octyl-3-methylimidazolium hexafluorophosphate ([OMIM]PF6

Isobaric vapor-liquid equilibrium (VLE) data for the methanol-methyl ethyl ketone (MEK) system containing 1-octyl-3-methylimidazolium hexafluorophosphate (OMIM]PF₆) with varying mole fractions of 5%, 8%, 10% and 20% at 101.3kPa have been measured in a modified Othmer still. The VLE data were fitted with the NRTL model. The vapor-liquid equilibrium curves of methanol-MEK with OMIM]PF₆deviate from that without OMIM]PF₆. The azeotropic point disappeared when the mole fraction of OMIM]PF₆was 8%, and higher mole fractions of OMIM]PF₆ led to an increasing salt effect. The results show that OMIM]PF₆ is a suitable solvent for extractive distillation of the methanol-MEK system.