High Solubilities for Methane, Ethane, Ethylene, and Propane in Trimethyloctylphosphonium Bis(2,4,4-trimethylpentyl) Phosphinate ([P8111][TMPP])

Xiangyang Liu, Elia Ruiz, Waheed Afzal, Victor R Ferro, José Palomar, John M Prausnitz

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Solubilities are reported for methane, ethane, ethylene, and propane in trimethyloctylphosphonium bis(2,4,4-trimethylpentyl) phosphinate [P8111][TMPP] from 299 to 323 K up to 4 MPa. Consistent with prediction of COSMO-RS, [P8111][TMPP] shows large solubilities for all four hydrocarbons. Contrary to solubility data in conventional ionic liquids, in [P8111][TMPP] the solubility for ethane is higher than that for ethylene. When compared with solubilities in other similar phosphonium-based ionic liquids, the cation has only a small influence on the solubilities of small hydrocarbons. Ionic liquid [P8111][TMPP] may be useful for storage or separation of small hydrocarbons.
Original languageEnglish
Pages (from-to)363-368
Number of pages6
JournalIndustrial & Engineering Chemistry Research
Issue number1
Early online date14 Oct 2013
Publication statusPublished - 8 Jan 2014


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