Abstract
Room temperature ionic liquid, which are nonvolatile, inflammable, and good solvation power, has attracted a lot of recent attention as a "green solvent" alternative. In this work, solid-liquid and liquid-liquid equilibria of [emim][PF6]+water and liquid-liquid equilibria of [bmim][PF6]+water are studied. UV was used to measure the solubility of ionic liquid in water phase. Karl-Fischer was used to measure the solubility of water in ionic phase. The solubility of [bmim][PF6] in water phase (2.36+0.08 wt% at 303 K to 3.67+0.2 wt% at 323 K) is less than that of [emim][PF6] and increases with increasing temperatures. The solubility of water in liquid [bmim][PF6] phase changes from about 2.70+0.03 wt% at 303 K to 3.70+0.03wt% at 323 K.While solubilities of ionic liquids in water are small, they are far from negligible. Hence cautions must be taken to prevent lost into environment when these chemicals are used. So we are conducting experiments to measure the partition of ionic liquids between water and biocompatible organic liquids such as 1-octanol and other alcohols. UV and TGA was used to measure the solubility of ionic liquid in water phase. GC was used to measure the solubility of 1-octanol in water phase. Karl-Fischer was used to measure the solubility of water in 1-octanol phase. TGA was also used to measure the solubility of ionic liquid in 1-octanol phase. But the solubility of 1-octanol in water phase and the solubility of ionic liquid in 1-octanol phase remained to be investigated.