水热预处理工艺参数对玉米秸秆组分与酶解效率的影响

doi:10.11949/j.issn.0438-1157.20141256

化工学报 ›› 2015, Vol. 66 ›› Issue (4): 1529-1536.DOI: 10.11949/j.issn.0438-1157.20141256

水热预处理工艺参数对玉米秸秆组分与酶解效率的影响

李梓木¹, 于艳玲^1,2, 孙嘉星², 李冬梅¹, 冯玉杰¹

1. 哈尔滨工业大学城市水资源与水环境国家重点实验室, 黑龙江哈尔滨 150090;
2. 哈尔滨工业大学化工学院, 黑龙江哈尔滨 150001

收稿日期:2014-08-20 修回日期:2014-12-17 出版日期:2015-04-05 发布日期:2015-04-05
通讯作者: 冯玉杰,于艳玲
作者简介:李梓木(1985-),男,博士研究生。
基金资助:
国家自然科学基金项目(51108116);国家杰出青年科学基金项目(51125033)。

Effects of liquid hot water pretreatment process parameters on components and cellulose digestibility of corn stover

LI Zimu¹, YU Yanling^1,2, SUN Jiaxing², LI Dongmei¹, FENG Yujie¹

1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China;
2. School of Chemical Engineering &Technology, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China

Received:2014-08-20 Revised:2014-12-17 Online:2015-04-05 Published:2015-04-05
Supported by:
supported by the National Natural Science Foundation of China (51108116) and the National Natural Science Fund for Distinguished Young Scholars (51125033).

摘要/Abstract

摘要：

采用间歇式水热预处理方法,考察了不同水热预处理温度和处理时间对玉米秸秆主要成分变化的影响以及水热预处理后的纤维素酶解效率。在180～220℃,10～25 min范围内,随温度升高和时间延长预处理后半纤维素移除率和纤维素损失率也随之增大,但木质素质量并未减少反而有所增加。在210℃,25 min时得到最大半纤维素移除率为86.0%。以半纤维素移除率、木质素移除率和纤维素损失率为因变量,处理温度和处理时间为自变量通过多元线性回归分析或二次方程(多元线性回归方程拟合度不佳时)拟合分别获得回归模型。模型显示处理温度和处理时间对三者均具有显著影响。分析敏感性显示处理温度对三种因变量的影响均大于处理时间。经210℃,20 min处理后,纤维素酶解率最高为76.2%,继续提高处理温度和延长处理时间半纤维素移除率提高,但纤维素酶解率下降。

关键词: 水热, 生物质, 玉米秸秆, 预处理, 酶解

Abstract:

Corn stover was pretreated with liquid hot water (LHW) method using a batch rector in order to enhance cellulose digestibility. The effects of pretreatment process parameters (pretreatment temperature 180-220℃, reaction time 10-25 min) on the main components (hemicellulose, lignin, and cellulose) and cellulose digestibility were investigated. Multiple linear regression models or quadratic equation models (only for lignin removal) were established by analyzing hemicellulose removal, lignin removal, and cellulose loss as dependent variables and pretreatment temperature and reaction time as independent variables. Hemicellulose removal and cellulose loss increased with increasing pretreatment temperature and reaction time over the range of experimental conditions. Compared to lignin in raw corn stover, mass of lignin in pretreated corn stover increased (lignin removal was negative), also as a function of increasing pretreatment temperature and reaction time, probably because of the formation of pseudo-lignin. Sensitivity analyses showed that the significance level of pretreatment temperature was much higher than that of the reaction time on these three dependent variables. The maximum enzymatic digestibility (76.2%) of cellulose in raw corn stover was achieved after the pretreatment (210℃, 20 min). Higher severity conditions caused more hemicellulose removal, as well as more cellulose loss, thus lowering the enzymatic digestibility of cellulose in raw corn stover.

Key words: hydrothermal, biomass, corn stover, pretreatment, enzymatic hydrolysis

中图分类号:

X712

李梓木, 于艳玲, 孙嘉星, 李冬梅, 冯玉杰. 水热预处理工艺参数对玉米秸秆组分与酶解效率的影响[J]. 化工学报, 2015, 66(4): 1529-1536.

LI Zimu, YU Yanling, SUN Jiaxing, LI Dongmei, FENG Yujie. Effects of liquid hot water pretreatment process parameters on components and cellulose digestibility of corn stover[J]. CIESC Journal, 2015, 66(4): 1529-1536.

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水热预处理工艺参数对玉米秸秆组分与酶解效率的影响

Effects of liquid hot water pretreatment process parameters on components and cellulose digestibility of corn stover

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