Measurement and Prediction of Vapor Pressure for H20 ＋ CHaOH] C2HsOH ＋ [BMIM][DBP] Ternary Working Fluids  

Measurement and Prediction of Vapor Pressure for H20 ＋ CH3OH] C2H5OH ＋ [BMIM][DBP] Ternary Working Fluids

作　　者：张晓冬 胡大鹏 赵宗昌 

机构地区：[1]School of Chemical Machinery, Dalian University of Technology [2]School of Chemical Engineering, Dalian University of Technology

出　　处：《Chinese Journal of Chemical Engineering》2013年第8期886-893,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （51076021）

摘　　要：The ionic liquid, 1-butyl-3-methylimidazolium dibutylphosphate ([BMIM][DBP]) was prepared and the vapor pressures of three set of binary solutions H2O(1)/CH3OH(1)/C2H5OH(1) + [BMIM][DBP](2) were measured at different temperature and in the ILs mole fraction range from 0.1 to 0.6 with a static equilibrium apparatus. The measured vapor pressures were correlated with Non-Random Two Liquid (NRTL) activity coefficient model and the average relative deviations (ARD) between experimental and correlated vapor pressures for these binary solutions were 3.19%, 2.42% and 2.95%, respectively. Then, the vapor pressures of two set of ternary solutions H2O(1) + CH3OH(2)/C2H5OH(2) + [BMIM][DBP](3) were measured with an inclined boiling apparatus and further predicted with NRTL activity coefficient model based on the binary interaction parameters coming from fitting the vapor pressures of the binary solutions. The results indicated that the ternary solutions containing [BMIM][DBP] were shown a strong negative deviation from Raoult's Law when the mole fraction of [BMIM][DBP] was larger than 0.2, which meant that ternary solutions could absorb the refrigerant vapors at the same or below solution temperature. Meanwhile, the average relative deviations between experimental and predicted vapor pressures for ternary solutions were 2.92% and 3.06%, respectively. Consequently, the NRTL active coefficient model used for non-electrolyte solutions was still valid for predicting vapor-liquid equilibrium of binary or ternary solutions containing ILs.The ionic liquid, 1-butyl-3-methylimidazolium dibutylphosphate （[BMIM][DBP]） was prepared and the vapor pressures of three set of binary solutions H2O（1）/CH3OH（1）/C2H5OH（1） ＋ [BMIM][DBP]（2） were measured at different temperature and in the ILs mole fraction range from 0.1 to 0.6 with a static equilibrium apparatus. The measured vapor pressures were correlated with Non-Random Two Liquid （NRTL） activity coefficient model and the average relative deviations （ARD） between experimental and correlated vapor pressures for these binary solutions were 3.19%, 2.42% and 2.95%, respectively. Then, the vapor pressures of two set of ternary solutions H2O（1） ＋ CH3OH（2）/C2H5OH（2） ＋ [BMIM][DBP]（3） were measured with an inclined boiling apparatus and further predicted with NRTL activity coefficient model based on the binary interaction parameters coming from fitting the vapor pressures of the binary solutions. The results indicated that the ternary solutions containing [BMIM][DBP] were shown a strong negative deviation from Raoult＇s Law when the mole fraction of [BMIM][DBP] was larger than 0.2, which meant that ternary solutions could absorb the refrigerant vapors at the same or below solution temperature. Meanwhile, the average relative deviations between experimental and predicted vapor pressures for ternary solutions were 2.92% and 3.06%, respectively. Consequently, the NRTL active coefficient model used for non-electrolyte solutions was still valid for predicting vapor-liquid equilibrium of binary or ternary solutions containing ILs.

关 键 词：ionic liquid ternary working fluids vapor pressure NRTL model absorption refrigeration 

分 类 号：O642.42[理学—物理化学] S66[理学—化学]