化工学报 ›› 2016, Vol. 67 ›› Issue (6): 2605-2611.DOI: 10.11949/j.issn.0438-1157.20151842

• 能源和环境工程 • 上一篇    下一篇

水热预水解分离相思木半纤维素及其组分与结构分析

朱宁1, 石海强1,2, 曹楠1, 熊学东1, 牛梅红1, 平清伟1   

  1. 1. 大连工业大学轻工与化学工程学院, 辽宁 大连 116034;
    2. 华南理工大学制浆造纸工程国家重点实验室, 广东 广州 510640
  • 收稿日期:2015-12-07 修回日期:2015-12-22 出版日期:2016-06-05 发布日期:2016-06-05
  • 通讯作者: 石海强, 牛梅红
  • 基金资助:

    国家自然科学基金项目(31470603);辽宁省自然科学基金项目(2015020592);辽宁省"百千万人才工程"培养项目(2014921064);制浆选纸工程国家重点实验室项目(201449)。

Isolation of hemicelluloses from acacia wood with hydrothermal prehydrolysis and its characterization of structure and component

ZHU Ning1, SHI Haiqiang1,2, CAO Nan1, XIONG Xuedong1, NIU Meihong1, PING Qingwei1   

  1. 1. School of Light Industry & Chemical Engineering, Dalian Polytechnic University, Dalian 116034, Liaoning, China;
    2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2015-12-07 Revised:2015-12-22 Online:2016-06-05 Published:2016-06-05
  • Supported by:

    supported by the National Natural Science Foundation of China (31470603), the Natural Science Foundation of Liaoning Province (2015020592), the Liaoning BaiQianWan Talents Program (2014921064) and the Open Foundation of State Key Laboratory of Pulp and Paper Engineering (201449).

摘要:

通过水热预水解法处理相思木制得预水解液,采用乙醇沉淀回收预水解液中的半纤维素,通过条件实验优化了最佳回收半纤维素的预水解条件,然后对回收的半纤维素进行热稳定性、成分和结构分析。结果发现,获得最大半纤维素回收率的预水解条件为170℃/20min,原料中碳水化合物回收率为3.93%,回收的半纤维素中木糖为主要成分占75.56%,葡萄糖占10.71%,半乳糖占7.80%。离子色谱分析表明160℃/40min,170℃/15min、170℃/25min和180℃/15min水解条件下的回收半纤维素组分与170℃/20min时的回收半纤维素化学组分相同,但含量上略有差别;热重分析表明水解温度提高和时间延长使回收半纤维素热稳定性降低;核磁共振和红外光谱分析结果表明回收半纤维素的聚木糖主链上残留有乙酰基、阿拉伯糖和半乳糖连接。

关键词: 生物质, 水解, 半纤维素, 分离, 水热

Abstract:

Hydrothermal prehydrolysis of acacia wood was conducted at various conditions and the hemicelluloses dissolved in prehydrolysate was recovered by ethanol precipitation. Conditions test design was used to optimize the pre-hydrolysis conditions for the maximum hemicelluloses recovery rate as solid phase. Then, the composition, thermal stability and structural characterization were analyzed on the recovered hemicelluloses. The optimum pre-hydrolysis temperature and time were determined to be 170℃ and 20 min, respectively. Recovery rate of 3.93% against carbohydrate content of wood chip was obtained under the optimum conditions and main composition was xylose, accounting for 75.56% in mass, and 10.71% of glucose and 7.80% of galactose were also found. The recovered hemicelluloses at 160℃/40 min, 170℃/15 min,170℃/25 min and 180℃/15 min showed a same composition with the result of 170℃/20 min but a little bit difference in the content by the analysis of ion chromatography. The thermo gravimetric analysis indicated that thermal stability of recovered hemicelluloses decreased along with the improvement of prehydrolysis temperature and extension of prehydrolysis time. Linkage of acetyl group, arabinose and galactose was found on the xylan chain by the analysis of nuclear magnetic resonance and Fourier transform infrared spectroscopy.

Key words: biomass, hydrolysis, hemicelluloses, separation, hydrothermal

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