Hydrothermal treatment of wheat straw at pilot plant scale using a three-step reactor system aiming at high hemicellulose recovery, high cellulose digestibility and low lignin hydrolysis

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• 作者：Mette Hedegaard Thomsen ; Anders Thygesen ; Anne Belinda Thomsen
• 关键词：Lignocellulose ; Pilot plant ; Bioethanol ; Combustion enthalpy ; Enzymatic hydrolysis
• 刊名：Bioresource Technology
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：99
• 期：10
• 页码：4221-4228
• 全文大小：287 K

文摘

A pilot plant (IBUS) consisting of three reactors was used for hydrothermal treatment of wheat straw (120–150 kg/h) aiming at co-production of bioethanol (from sugars) and electricity (from lignin). The first reactor step was pre-soaking at 80 °C, the second extraction of hemicellulose at 170–180 °C and the third improvement of the enzymatic cellulose convertibility at 195 °C. Water added to the third reactor passed countercurrent to straw. The highest water addition (600 kg/h) gave the highest hemicellulose recovery (83 % ). With no water addition xylose degradation occurred resulting in low hemicellulose recovery (33 % ) but also in high glucose yield in the enzymatic hydrolysis (72 g/100 g glucose in straw). Under these conditions most of the lignin was retained in the fibre fraction, which resulted in a lignin rich residue with high combustion energy (up to 31 MJ/kg) after enzymatic hydrolysis of cellulose and hemicellulose.