Vapor-Liquid Equilibrium of Trioxane-Formaldehyde-Water-[BMIM][NO3]System
The effects of ionic liquids[BMIM][NO3]on the vapor-liquid equilibria of formaldehyde-trioxane-water(FA-TOX-H2O)systems were studied.The results showed that adding[BMIM][NO3]could effectively improve the vapor-liquid equilibrium of the system,and adding a certain amount of[BMIM][NO3]could eliminate the azeotrope phenomenon.The non-random two-liquid(NRTL)model was used to fit the experimental data.The average relative deviation between experimental and calculated values of the TOX-H2O-[BMIM][NO3]ternary system was 1.32%,and that of the FA-H2O-[BMIM][NO3]ternary system was 1.74%.The vapor-liquid equilibrium of TOX-FA-H2O-[BMIM][NO3]was measured.The results showed that the addition of[BMIM][NO3]could increase the molar fraction of TOX in the vapor phase by 17.49%.The results are significant for increasing the molar fraction of TOX in vapor phase.
trioxaneformaldehydevapor-liquid equilibriumionic liquidNRTL model