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Separation of a Biofuel: Recovery of Biobutanol by Salting‐Out and Distillation
Author(s) -
Xie Shaoqu,
Qiu Xueqing,
Yi Conghua
Publication year - 2015
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500140
Subject(s) - acetone , butanol , distillation , chemistry , salting out , salting , biofuel , chromatography , fermentation , n butanol , ethanol , waste management , organic chemistry , aqueous solution , food science , engineering
The second generation biofuel butanol can be produced by acetone‐butanol‐ethanol (ABE) fermentation, but the separation from the broth is still challenging. Therefore, dipotassium hydrogen phosphate was investigated as salting‐out agent. The ABE fermentation broth was enriched by a prefractionator after being preheated. The enriched ABE solution was salted out by K 2 HPO 4 solutions at different temperatures. The water in the supplemented ABE solution was largely removed by the salting‐out method. The energy requirements for the prefractionator and the butanol column were significantly reduced. The total energy demand for the recovery of acetone, butanol, and ethanol by salting‐out and subsequent distillation was optimized. With the salting‐out process, the entire salting‐out and distillation method turned out to be more energy‐saving than the conventional one.