High-pressure phase equilibria for the synthesis of ionic liquids in compressed CO2 for 1-hexyl-3-methylimidazolium bromide with 1-bromohexane and 1-methylimidazole Export

@article{citeulike:5347059, abstract = {The use of carbon dioxide in the synthesis of ionic liquids (ILs) has many advantages over conventional solvents. Here, the high-pressure phase equilibria (including CO 2 solubility, volume expansion, and mixture critical points) are measured and modeled for the system involved in the synthesis of a model imidazolium ionic liquid 1-hexyl-3-methylimidazolium bromide ([HMIm][Br]) from 1-bromohexane and 1-methylimidazole. The global phase behavior of 1-methylimidazole was investigated and found to be a Type V system (or potentially IV) from the classification of Scott and van Konynenburg with regions of vapor-liquid equilibrium, vapor-liquid-liquid equilibrium, liquid-liquid equilibrium, an upper and lower critical endpoint and mixture critical points. The solubility and volume expansion of CO 2 in 1-methylimidazole, 1-bromohexane, a 1:1 mixture of 1-methylimidazole and 1-bromohexane and [HMIm][Br] was determined at 313.15 K and 333.15 K for pressures ranging from 10-160 bar. The solubility of CO 2 and the volume expansion increases in the order of [HMIm][Br]<<1-methylimidazole<1:1 mixture of reactants<1-bromohexane. The Peng-Robinson equation of state with van der Waals 2-parameter mixing rules was used with estimated critical properties to well correlate the vapor-liquid equilibrium. The results have important ramifications on the kinetics and process constraints of an actual IL synthesis with CO 2 .}, author = {Nwosu, Sylvia O. and Schleicher, Jay C. and Scurto, Aaron M.}, citeulike-article-id = {5347059}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.supflu.2009.07.006}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S089684460900240X}, day = {21}, doi = {10.1016/j.supflu.2009.07.006}, issn = {08968446}, journal = {The Journal of Supercritical Fluids}, keywords = {behavior, eos, global, highpressure, multicomponent, pengrobinson, phase, rtil}, month = {November}, number = {1}, pages = {1--9}, posted-at = {2009-09-12 14:26:55}, priority = {5}, title = {High-pressure phase equilibria for the synthesis of ionic liquids in compressed CO2 for 1-hexyl-3-methylimidazolium bromide with 1-bromohexane and 1-methylimidazole}, url = {http://dx.doi.org/10.1016/j.supflu.2009.07.006}, volume = {51}, year = {2009} }

TY - JOUR ID - citeulike:5347059 L3 - citeulike-article-id:5347059 N2 - The use of carbon dioxide in the synthesis of ionic liquids (ILs) has many advantages over conventional solvents. Here, the high-pressure phase equilibria (including CO 2 solubility, volume expansion, and mixture critical points) are measured and modeled for the system involved in the synthesis of a model imidazolium ionic liquid 1-hexyl-3-methylimidazolium bromide ([HMIm][Br]) from 1-bromohexane and 1-methylimidazole. The global phase behavior of 1-methylimidazole was investigated and found to be a Type V system (or potentially IV) from the classification of Scott and van Konynenburg with regions of vapor-liquid equilibrium, vapor-liquid-liquid equilibrium, liquid-liquid equilibrium, an upper and lower critical endpoint and mixture critical points. The solubility and volume expansion of CO 2 in 1-methylimidazole, 1-bromohexane, a 1:1 mixture of 1-methylimidazole and 1-bromohexane and [HMIm][Br] was determined at 313.15 K and 333.15 K for pressures ranging from 10-160 bar. The solubility of CO 2 and the volume expansion increases in the order of [HMIm][Br]<<1-methylimidazole<1:1 mixture of reactants<1-bromohexane. The Peng-Robinson equation of state with van der Waals 2-parameter mixing rules was used with estimated critical properties to well correlate the vapor-liquid equilibrium. The results have important ramifications on the kinetics and process constraints of an actual IL synthesis with CO 2 . IS - 1 JF - The Journal of Supercritical Fluids SN - 08968446 EP - 9 TI - High-pressure phase equilibria for the synthesis of ionic liquids in compressed CO2 for 1-hexyl-3-methylimidazolium bromide with 1-bromohexane and 1-methylimidazole VL - 51 SP - 1 KW - behavior KW - eos KW - global KW - highpressure KW - multicomponent KW - pengrobinson KW - phase KW - rtil AU - Nwosu, Sylvia AU - Schleicher, Jay AU - Scurto, Aaron PY - 2009/11/21/ UR - http://dx.doi.org/10.1016/j.supflu.2009.07.006 ER -