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制浆黑液固形物与工业木质素热解液化产物分析

期刊名称：林产化学与工业，2008，28（4）：65-70
时间：0
分类：TQ351[化学工程] X793[环境科学与工程—环境工程]
作者机构：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640, [2]湖北师范学院化学与环境工程学院,湖北黄石435002
相关基金：基金项目：国家重点基础研究973项目（2007CB210201）;国家自然科学基金（20576043）;教育部“长江学者和创新团队发展计划”项目（IRT0552）
相关项目：工业木质素热化学裂解液化的机制与调控途径研究

关键词：工业碱木质素, 黑液, 液化, 热解-色谱-质谱联用, technical alkali lignin , black liquor, liquefication , Py-GC-MS

中文摘要：

采用管式炉研究了纯化后的工业碱木质素和制浆黑液固形物在不同温度下的热解产物分布规律。借助热解-色谱-质谱（Py-GC-MS）联用、元素分析仪、ICP等离子发射光谱等分析了热解液相产物（热解油）和固体残余物的主要组成。研究表明，在600℃下热解，纯化后的工业碱木质素和黑液固形物热解油产率最高，且工业木质素热解油产率明显高于黑液固形物。热解油的产物非常复杂，纯化后的工业碱木质素和黑液固形物的热解油化学组成有较大的差异。纯化后的工业碱木质素热解油主要由各种低相对分子质量（Mr）的酚类、酮类、有机酸等物质组成，这些物质的相对含量明显高于黑液固形物热解产物中的含量，其中不合有黑液固形物的热解产物中相对含量较高的左旋葡萄糖，却出现了可能因热解缩合而形成的联苯结构。说明在黑液固形物热解液化前，对试样进行适当前处理，可在很大程度上调控其热解产物的组成。

英文摘要：

The pattern of pyrolysis products distribution from purified technical alkali lignin and black-liquor solid under different temperatures were studied. The composition of liquid product （pyrolysis oil ） and solid residue from pyrolysis process were analyzed by pyrolysis-gas chromatography-mass spectrometry （Py-GC-MS）, elementary analysis and ICP plasma emission spectrum. Results showed the maximum yield of pyrolysis oil was obtained at 600 ℃, and the pyrolysis oil from alkali lignin was higher than that from black-liquor solid. The chemical composition of pyrolysis oil was very complicated, and components of pyrolysis oil from purified technical alkali lignin had lots of difference from that of black-liquor solid. The pyrolysis oil from purified technical alkali lignin was mainly consisted of low molecular phenolics, ketones, organic acids, etc. The relative contents of phenolics and organic acids in pyrolysis oil from technical lignin were obviously higher than those from black liquor solid. The relative content of laevoglucose was found to be higher in pyrolysis oil from black liquor solid than that from technical lignin, but biphenyl structure compound was detected in pyrolysis oil from technical lignin, which might be generated from condensation of intermediate products. The results give us the hint that it may be possible to control the composition of pyrolysis oil by suitable pretreatment of the black liquor.

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