木质纤维原料各组分温和液化行为

Mild liquefaction behavior of lignocellulosic material components

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。

Atmospheric pressure mild liquefaction processes were investigated to improve renewable energy resource utilization. With the sulfuric acid as the catalysts, bagasse, bagasse hollocellulose and bagasse cellulose were liquefied in ethylene glycol at 130- 190℃. The residuals mass distribution was studied with infrared （IR） spectroscopy analysis of the liquefied products for various conditions. At lower temperatures, cellulose is not easily liquefied, while hemicellulose and lignin are more easily liquefied. At higher temperatures, the cellulose can be effectively liquefied, while the lignin and hemicellulose tend to be repolymerized to form an insoluble residue. The residue percentages can be significently reduced by two step liquefaction with a low temperature liquefaction followed by higher temperature liquefaction. Most of the liquefied products from cellulose and hemicellulose were in the water-soluble fraction, which most of the products from lignin were in the acetone-soluble fraction.