The ability of a number of ionic liquids to extract 1,3-propanediol and 2,3-butanediol from aqueous solution was investigated. A range of hydrophobic ionic liquids were prepared and compared. The long chain phosphonium salts containing the trihexyltetradecyl phosphonium [P66614] cation exhibited promising extraction behavior. Among them, [P66614] [octanesulfonate (C8SO3)] combined high hydrophobicity, good stability, and relatively high extraction efficiency with the distribution coefficient DBDO = 0.390 and extraction selectivity SBDO = 4.83 (2,3-butanediol) and DPDO = 0.219 and SPDO = 2.65 (1,3-propanediol) at 25 °C. Additionally, this material exhibited good compatibility with the fermentation process, facilitating its use in bioprocesses.
Bibliographical noteThis paper was ACS Editors' choice on August 15, 2017. It was the 17th most read article in the last 12 months on 30th July 2018.
- 1,3-Propanediol; 2,3-Butanediol; Biocatalysis; Ionic Liquids; Renewables