Measurement and correlation of supercritical CO2 and ionic liquid systems for design of advanced unit operations
Measurement and correlation of supercritical CO2 and ionic liquid systems for design of advanced unit operations
Hiroshi MACHIDA1, Ryosuke TAGUCHI1, Yoshiyuki SATO1, Louw J. FLOURUSSE3, Cor J. PETERS4,5, Richard L. SMITH1,2()
1. Department of Chemical Engineering, Research Center of Supercritical Fluid Technology, Tohoku University, Sendai, Japan; 2. Graduate School of Environmental Studies, Tohoku University, Sendai, Japan; 3. Laboratory of Applied Thermodynamics and Phase Equilibria, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands; 4. Laboratory of Process Equipment, Department of Process and Energy, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft, The Netherlands; 5. Petroleum Institute, Chemical Engineering Program, Bu Hasa Building, Room 2203, P.O. Box 2533, Abu Dhabi, United Arab Emirates
Ionicliquids combined with supercritical fluid technology hold great promise as working solvents for developing compact processes. Ionic liquids, which are organic molten salts, typically have extremely low volatility and high functionality, but possess high viscosities, surface tensions and low diffusion coefficients, which can limit their applicability. CO2, on the other hand, especially in its supercritical state, is a green solvent that can be used advantageously when combined with the ionic liquid to provide viscosity and surface tension reduction and to promote mass transfer. The solubility of CO2 in the ionic liquid is key to estimating the important physical properties that include partition coefficients, viscosities, densities, interfacial tensions, thermal conductivities and heat capacities needed in contactor design. In this work, we examine a subset of available high pressure pure component ionic liquid PVT data and high pressure CO2 - ionic liquid solubility data and report new correlations for CO2-ionic liquid systems with equations of state that have some industrial applications including: (1) general, (2) fuel desulfurization, (3) CO2 capture, and (4) chiral separation. New measurements of solubility data for the CO2 and 1-butyl-3-methylimidazolium octyl sulfate, [bmim][OcSO4] system are reported and correlated. In the correlation of the CO2 ionic liquid phase behavior, the Peng-Robinson and the Sanchez-Lacombe equations of state were considered and are compared. It is shown that excellent correlation of CO2 solubility can be obtained with either equation and they share some common characteristics regarding interaction parameters. In the Sanchez-Lacombe equation, parameters that are derived from the supercritical region were found to be important for obtaining good correlation of the CO2-ionic liquid solubility data.
Corresponding Author(s):
L. SMITH Richard,Email:smith@scf.che.tohoku.ac.jp
引用本文:
. Measurement and correlation of supercritical CO2 and ionic liquid systems for design of advanced unit operations[J]. Frontiers of Chemical Engineering in China, 2009, 3(1): 12-19.
Hiroshi MACHIDA, Ryosuke TAGUCHI, Yoshiyuki SATO, Louw J. FLOURUSSE, Cor J. PETERS, Richard L. SMITH. Measurement and correlation of supercritical CO2 and ionic liquid systems for design of advanced unit operations. Front Chem Eng Chin, 2009, 3(1): 12-19.
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