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Pretreatment of rice straw with recycled ionic liquids by phase‐separation process for low‐cost biorefinery
Author(s) -
Wei HaoLin,
Wang YuTao,
Hong YingYing,
Zhu MingJun
Publication year - 2021
Publication title -
biotechnology and applied biochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.468
H-Index - 70
eISSN - 1470-8744
pISSN - 0885-4513
DOI - 10.1002/bab.2007
Subject(s) - biorefinery , chemistry , cellulose , hydrolysis , fermentation , cellulase , ionic liquid , extraction (chemistry) , biomass (ecology) , pulp and paper industry , enzymatic hydrolysis , reducing sugar , straw , ethanol , chromatography , sugar , organic chemistry , agronomy , catalysis , raw material , inorganic chemistry , biology , engineering
An efficient ionic liquids (ILs) recycle technology will increase the economic viability of lignocellulosic biorefinery. The availability of recycling 1‐butyl‐3‐methylimidazolium chloride for rice straw (RS) pretreatment was conducted. The kosmotropic salt K 3 PO 4 (TKP) solution was used as antisolvent for cellulose precipitation and forming a three‐phase system consisting of biomass, ILs‐rich, and salt‐rich phases. The upper ILs phase and the bottom TKP phase were recycled without additional purification, which significantly simplifies the process for recovering ILs. Subsequently, the RS pretreated with multiple reusing ILs (RPRS) were investigated by components analysis, structure evolution, enzymatic hydrolysis, and fermentation experiments. The results showed that unpurified reusing ILs led to further delignification and improvement of enzyme accessibility of the pretreated RS. The reducing sugar yield of RS pretreated with 8th reusing IL (8th RPRS) could still reach 98.9%, and the ethanol and succinic acid concentrations achieved 91.9 and 29.3 g/L by simultaneous saccharification and cofermentation. The present study demonstrated that the ILs recovered by phase‐separation process could be used for RS pretreatment, and achieving high titer ethanol fermentation.