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Influence of ionic liquid on polar organic compounds solubility in dense CO2 phase
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Resumo(s)
Accurate measurement and prediction of the phase behaviour of mixtures involved in a chemical process are crucial for its optimisation. Given the importance of CO2 conversion technologies and considering possible benefits of CO2-ionic liquid biphasic systems, i.e., facilitating a product separation, we investigated the high-pressure behaviour of components of interest in a recently developed process of cyclic carbonate synthesis directly from CO2 and potentially bio-based alcohols. The solubility of 1,2-butanediol and 1,2-butylene carbonate in a dense carbon dioxide phase was determined experimentally at the temperature of 313.2 K and pressures between 6 and 18 MPa. The influence of 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate ionic liquid, [hmim][FAP], as a solvent, on the solubility of these compounds in CO2-rich phase, in ternary (CO2 + 1,2-butanediol + [hmim][FAP]), CO2 + butylene carbonate + [hmim][FAP]) and quaternary (CO2 + 1,2-butanediol + butylene carbonate + [hmim][FAP]) mixtures was investigated. The experimental results of the two binary systems were correlated using the density-based Chrastil equation. The knowledge of phase equilibria behaviours reported in this work will be useful for designing chemical conversions of carbon dioxide using [hmim][FAP] ionic liquid as reaction solvents.
Descrição
This work was supported by Fundação para a Ciência e Tecnologia FCT/MCTES projects MIT-EXPL/CS/0052/2021 of the Associate Laboratory for Green Chemistry – LAQV ,
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© 2023 The Authors
Palavras-chave
Butanediol Cyclic carbonate High-pressure carbon dioxide Multicomponent systems Phase behaviour Tris(pentafluoroethyl)trifluorophosphate ionic liquid General Chemical Engineering Condensed Matter Physics Physical and Theoretical Chemistry SDG 13 - Climate Action