We measured binary vapor liquid equilibrium data of the carbon dioxide + dimethyl carbonate system and the carbon dioxide + diethyl carbonate system at temperatures from 310 K to 340 K. A circulating type apparatus with on-line gas chromatography was used in this study. The measured data were correlated well by the Peng−Robinson equation of state using van der Waals one fluid mixing rules.
Binary vapor liquid equilibrium data were measured for the carbon dioxide + tetrahydrofuran system at five temperatures from (311.01 to 331.33) K. A circulating type apparatus with on-line gas chromatography was used in this study. The measured data were correlated well by the Peng-Robinson equation of state with van der Waals one fluid mixing rules. IntroductionRecently, many research groups have made particles with the supercritical antisolvent (SAS) process to use in various fields of polymer, biopolymer, and pharmaceutical industries and so forth. The SAS process is a promising technique to produce micronized particles. CO 2 is generally used as an antisolvent because not only is it miscible with various solvents but it also has a low critical temperature. Moreover, it is nontoxic, nonflammable, and inexpensive. The SAS process is based on the following principle. When the solution is injected into antisolvent (CO 2 ), which is miscible with the solvent but cannot dissolve the solute, the solute is supersaturated and precipitated. At this stage, the formation of micronized particles is known to occur. 1-3 Thus, the choice of the solvent is the most important thing considered in the SAS process. They must be completely miscible with each other at operating conditions, and the antisolvent must not dissolve the solute. To choose a good solvent for the CO 2 , vapor-liquid equilibrium data for CO 2 and solvents are required. Phase equilibrium data are also used to predict the phase behavior of CO 2 + solvent systems to find the optimum operating conditions to control the particle size, but the data are scarce. THF is often used in the polymer industry, because various polymers such as polystyrene, poly(methyl methacrylate) (PMMA), polycarbonate, and so forth are soluble in the solvent. Thus, THF is expected to work as a solvent in the SAS process. Therefore, we measured binary vapor-liquid equilibria of CO 2 + tetrahydrofuran (THF) at temperatures from (311.01 to 331.33) K. The measured data were correlated with the Peng-Robinson equation of state (EOS) and the van der Waals one fluid mixing rules.
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