文献类型：期刊文献

英文题名：Re-examination of dilute acid hydrolysis of lignocellulose for production of cellulosic ethanol after de-bottlenecking the inhibitor barrier

作者：Zhang, Bin[1];Wu, Lei[1];Wang, Ya[2];Li, Jing[1];Zhan, Baorui[1];Bao, Jie[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Shihezi Univ, Sch Chem & Chem Engn, Beisi Rd, Shihezi 800032, Xinjiang, Peoples R China

年份：2022

卷号：353

起止页码：36

外文期刊名：JOURNAL OF BIOTECHNOLOGY

收录：;EI(收录号：20222412212862);WOS:【SCI-EXPANDED(收录号:WOS:000860321500005)】；

基金：This research was supported by the National Natural Science Foundation of China (21978083, 31961133006) .

语种：英文

外文关键词：Dilute acid hydrolysis; Lignocellulose; Biodetoxification; Inhibitors; Cellulosic ethanol

摘要：Dilute acid hydrolysis of lignocellulose biomass had been used for production of cellulosic ethanol since 1940 s. The major technical barrier is the acid catalyzed dehydration of monosaccharides to furan aldehydes (furfural and 5-hydroxymethylfurfural), resulting in the high loss of fermentable sugars and significant inhibition on the fermentability of ethanologenic strains. This study re-examined the dilute acid hydrolysis of corn stover and cellulosic ethanol fermentation after a novel biodetoxification approach was introduced to de-bottleneck the inhibitor barrier. The cocktail of sulfuric acid, phosphoric acid and oxalic acid hydrolyzed corn stover to the 51.1 g/L of glucose (0.50 g/g cellulose) and 18.1 g/L of xylose (0.22 g/g xylan). The furfural, 5-hydroxymethylfurfu-ral and acetic acid in the corn stover hydrolysate were completely removed by Paecilomyces variotii FN89, leading to the successful ethanol fermentation of 24.2 g/L, corresponding to 72.6 kg per metric ton of dry corn stover. No wastewater streams, solid wastes and toxic compounds were generated in hydrolysis, biodetoxification and fermentation. The techno-economic evaluations suggest that the cost reduction of replacing cellulase enzyme with cheap acid catalysts compensated the partial ethanol loss of sugar conversion to inhibitors (21.5-89.1%). The re-examination of acid hydrolysis process reveals that a substantial breakthrough in highly active and se-lective acid catalyst is required for acid hydrolysis to compete with enzymic hydrolysis for cellulosic ethanol fermentation.