Acetone-butanol-ethanol from sweet sorghum juice by an immobilized fermentation-gas stripping integration process

摘要

In this study, sweet sorghum juice (SSJ) was used as the substrate in a simplified ABE fermentation-gas stripping integration process without nutrients supplementation. The sweet sorghum bagasse (SSB) after squeezing the fermentable juice was used as the immobilized carrier. The results indicated that the productivity of ABE fermentation process was improved by gas stripping integration. A total 24 g/L of ABE solvents was obtained from 59.6 g/L of initial sugar after 80 h of fermentation with gas stripping. Then, long-term of fed-batch fermentation with continuous gas stripping was further performed. 112.9 g/L of butanol, 44.1 g/L of acetone, 9.5 g/L of ethanol (total 166.5 g/L of ABE) was produced in overall 312 h of fermentation. At the same time, concentrated ABE product was obtained in the condensate of gas stripping. (C) 2016 Elsevier Ltd. All rights reserved.