Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2018-08-01

Journal: PROCESS BIOCHEMISTRY

Included Journals: SCIE

Volume: 71

Page Number: 175-181

ISSN: 1359-5113

Key Words: Salting-out extraction; 2,3-butanediol; Ionic liquids; Partition behavior; Fermentation broth

Abstract: Salting-out extraction is an efficient technique for the separation of bio-based chemicals from fermentation broths. So far, salting-out extraction of 2,3-butanediol has mainly focused on systems composed of organic solvents and salts, while less attention has been given to the green solvent - ionic liquids. In this research, imidazolium ionic liquids were used to examine the recovery of 2,3-butanediol from fermentation broths. The influences of the temperature and concentration of 2,3-butanediol on phase formation were determined using two systems of 1-butyl-3-methylimidazolium chloride ([C(4)mim] [CI])-K2HPO4 and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([C(2)mim)(CF3SO3])-K2HPO4 . The partition behaviors of 2,3-butandiol and ionic liquids, and the selectivity of 2,3-butanediol over glucose and organic acids were investigated and compared at different concentrations of ionic liquids and K2HPO4 . Most of 2,3-butanediol and ionic liquids were distributed to the top phase, whereas different trends of partition coefficient variation were observed. Under the condition of 25% [C(2)mim] [CF3SO3]-30% K2HPO4 (w/w), the recovery of 2,3-butanediol and [C(2)mim] [CF3SO3] was 95.7% and 99.5%, respectively, and selectivity for glucose, succinic acid and lactic acid was 2.59, 115 and 20.8, respectively.