Solubility of CO2 in CO2-philic oligomers; COSMOtherm predictions and experimental results |
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| Authors: | Matthew B Miller De-Li Chen Hong-Bin Xie David R Luebke J Karl Johnson Robert M Enick |
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| Institution: | 1. U.S. Department of Energy, National Energy Technology Laboratory, P.O. Box 10940, Pittsburgh, PA 15236, USA;2. Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA |
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| Abstract: | We report the solubility of carbon dioxide in four physical solvents and compare our data to predicted phase behavior using the conductor-like screening model for real solvents (COSMO-RS) formalism. The solubility data are presented in pressure-composition (Px) diagrams as well as Henry's law coefficients on a wt% basis at 298.15 K. The oligomers presented in this study are poly ethylene glycol di-methyl ether (PEGDME), perfluoro polyether (PFPE), poly di-methyl siloxane (PDMS), and poly propylene glycol di-methyl ether (PPGDME), which is a new solvent designed for this application by our group. These oligomers had 2–5 repeat units. We assess these four oligomers for capturing CO2 from high-pressure streams. The COSMO-RS formalism is able to qualitatively and to some extent quantitatively describe solubilities of CO2 in each of the oligomers. |
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| Keywords: | Carbon dioxide Solubility Poly propylene glycol di-methyl ether Poly ethylene glycol di-methyl ether Poly di-methyl siloxane Perfluoro poly ether COSMO-RS COSMOtherm |
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