玉米芯残渣的碱性亚硫酸盐预处理及其反应动力学模型

楼宏铭1 林美露1 邱珂贤1 蔡诚1 庞煜霞1 杨东杰1 邱学青1

(1.华南理工大学化学与化工学院, 广东广州 510641)

【摘要】玉米芯提取木糖后残留了大量富含纤维素和木质素的废弃物。针对玉米芯残渣 (corncob residues, CCR) 中木质素含量高和半纤维素含量很低的特点, 采用碱性亚硫酸盐法进行预处理。研究了预处理p H、液固比、温度、亚硫酸盐用量等条件对纤维素保留率、木质素去除率、底物酶解效率以及预处理液中木质素磺酸钠含量的影响规律。结果表明, 当亚硫酸钠用量为10% (质量) 、氢氧化钠为5% (质量) 、液固比为6:1、160℃预处理1 h时, 可去除86.1%的木质素、保留82.4%的纤维素, 底物的72 h酶解率达85.1%[酶载量为5 FPU· (g葡聚糖) -1], 预处理液中木质素磺酸钠的收率为31.5 g· (100 g CCR) -1。为了指导放大试验和工程应用, 提出了一个能准确预测底物木质素含量的参数——木质素因子 (lignin factor, LF) , 在此基础上成功建立了脱木质素反应动力学经验公式以及底物酶解效率的预测方程, 预测值与实测值误差在10%之内。

【关键词】 生物质; 碱性亚硫酸盐预处理; 数学模拟; 预测; 反应动力学;

【DOI】

【基金资助】 国家自然科学基金项目 (21676109, 21376100) supported by the National Natural Science Foundation of China (21676109, 21376100) 广州市科技计划项目 (201707020025) Science and Technology Program of Guangzhou, China (201707020025) 广东省特支计划 (2016TX03Z298) Special Support Plan for Cultivating High-level Talents of Guangdong, China (2016TX03Z298) 广东省国际合作项目 (2013B051000011) International Cooperation Program of Guangdong, China (2013B051000011)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 01, Pages 507-514

January 2018

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Article Outline

摘要

  • 引言
  • 1 实验原料与测试方法
  • 2 结果与讨论
  • 3 结论
  • 符号说明
  • 参考文献