微波辅助木质素催化酸解机理研究

MECHANISM STUDY OF CATALYSIS ACIDOLYSIS OF LIGNIN ASSISTED BY MICROWAVE

采用微波辅助加热,在甲酸溶剂体系下（甲酸,分析纯）催化酸解木质素,获得以单酚类化合物为主的油1相和木质素部分降解并能溶于乙酸乙酯的大分子物质的油2相产物.实验研究不同分子筛催化剂（HY、HZSM-5、SBA-15）下加热温度（110～170℃）和反应时间（5～60 min）对油相产率以及单酚类化合物分布特性的影响规律.HY和HZSM-5分子筛催化剂能明显提高其液体产率（油1产率：9.69％～13.64％;油相总产率：64.09％～88.19％）,而SBA-15对于提高油1相产率作用不明显.分子筛催化剂明显提高了2-甲氧基苯酚（G1）、香兰素（G2）和2,6-二甲氧基苯酚（S1）的产率.最后基于实验结论解析,对产物中主要的Guaiacol（G）类和Syringol （S）类化合物的形成机理做出推断.

The catalytic acidolysis of black-liquor lignin was studied by microwave assisted heating, obtained oil phase 1 product mainly including phenolic compounds and oil phase 2 product mainly including macromolecular substances of partial degraded lignin that could be dissolved in ethyl acetate. The experiment studied the influence of heating temperature （ 110- 170 ℃ ） and reaction time （5- 60 min） of different zeolite catalysts （HY, HZSM- 5, SBA- 15） on oil phase yield and the distribution feature of phenolic compounds. HY and HZSM-5 zeolite catalysts could obviously improve the liquid yields （oill yield： 9.69%-13.64%, oil phase total yield： 64.09%-88.19%）. However, the function of SBA-15 on improving oil phase 1 yield was not obvious. The zeolite catalysts significantly enhanced the yields of 2-methoxy phenol （G1）, vanillin （G2） and 2,6-dimethoxy phenol （S1）. The formation mechanism of Guaiacol （G） and Syringol （S） compounds in product had been deduced based on the analyses of experiment conclusion.