木屑液化残渣的催化加氢醇解及产物分析

Catalytic Hydrogenation Alcoholysis of Sawdust Liquefaction Residuesand Products Analysis

以甲醇为溶剂、硅化镁为催化剂,对木屑液化残渣进行催化加氢醇解,研究温度与时间对生物油收率的影响;采用热重分析仪、扫描电镜、元素分析仪考察醇解残渣的性质,采用气质联用仪分析液化产物的组分分布及特征.结果表明,木屑液化残渣的生物油收率在2 h、290℃时达到最大值46.2%;木屑液化残渣中的纤维素和木质素结构发生了解离,表面结构被破坏;生物油主要由酚类化合物组成,相对含量高达76.1%,主要由苯酚、p-甲基苯酚、4-乙基苯酚、2-甲氧基-4-甲基苯酚、2-甲氧基-4-(1-烯丙基)苯酚等组成,说明木质素是木屑液化残渣主要组分,选用的木屑木质素的主要结构单元是愈创木基.

The catalytic hydrogenation alcoholysis of sawdust liquefaction residues with methanol as solvent and Mg2Si as catalyst is investigated,the influences of reaction temperature and time on bio-oil yield of sawdust liquefaction residue are examined.The alcoholysis residue is characterized by themogravimetry,scanning electron microscope,and element analysis.The composition and properties of bio-oil are determined by gas chromatography-mass spectrometry.The results show that the bio-oil yield reaches a maximum of 46.2% at 290 ℃ after reaction for 2 h.The components of cellulose and lignin in sawdust liquefaction residue are decomposed,and the surface structure of alcoholysis residual is destructed.The hydroxybenzenes are main constituents and the relative contents are up to 76.1% in bio-oil whereas the dominant compounds consist of mainly phenol,p-cresol,4-ethylphenol,2-methoxy-4-methylphenol,and 2-methoxy-4-（prop-1-en-1-yl）phenol.The results show that the lignin is a main component in sawdust liquefaction residue,and that the main structure unit of the lignin is guaiacol.