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为开发可再生资源和缓解能源危机,研究了木质纤维原料的常压温和液化过程。在浓硫酸催化下,将甘蔗渣、甘蔗渣综纤维和甘蔗渣纤维素在乙二醇中130~190℃液化。对不同液化条件下残渣率、产物质量分布和红外谱图的分析。结果表明:在较低温度下,纤维素不易液化,半纤维素和木质素易液化;在较高温度下,纤维素可有效液化,木质素和半纤维素易发生再聚合形成不溶残渣;先较低温度再较高温度两步液化可有效降低残渣率。纤维素和半纤维素液化产物主要分布在水相;木质素产物主要分布在丙酮相;残渣同时来自三种组分。
In order to develop renewable resources and ease the energy crisis, the normal pressure liquefaction process of lignocellulosic materials was studied. Under the catalytic action of concentrated sulfuric acid, bagasse, bagasse hemp and bagasse cellulose are liquefied in ethylene glycol at 130-190 ° C. Analysis of residue rate, product quality distribution and infrared spectrum under different liquefaction conditions. The results showed that cellulose could not be liquefied easily at low temperature, and liquefaction of hemicellulose and lignin was easy. At higher temperature, cellulose could be effectively liquefied, and lignin and hemicellulose could easily re-polymerize to form insoluble residue. Lower temperature and then higher temperature two-step liquefaction can effectively reduce the residue rate. Cellulose and hemicellulose liquefaction products are mainly distributed in the aqueous phase; lignin products are mainly distributed in the acetone phase; and the residue comes from three components at the same time.