以桉木预水解液为研究对象,第一步通过高温热水预水解桉木片获得预水解液,预水解后的桉木片则用于生产溶解浆;第二步预水解液在高压反应釜中以硫酸为催化剂反应制取糠醛。主要研究内容及结论如下:1)高温热水提取桉木片中半纤维素的工艺优化。实验结果表明:温度170℃、保温时间30min及液固比为5:1时,高温热水对桉木片中半纤维素的提取率达到最大值,为48.57%。 Taking eucalyptus pre-hydrolyzate as the research object, the first step is to pre-hydrolyze the eucalyptus chip by high temperature hot water to obtain the pre-hydrolyzate, and the pre-hydrolyzed eucalyptus chip is used for producing the dissolving pulp. The second step is to pre-hydrolyze the liquid in the autoclave Sulfuric acid as a catalyst for the preparation of furfural. The main contents and conclusions are as follows: 1) Process optimization of extraction of hemicellulose from eucalyptus chips by hot water. The experimental results show that the extraction rate of hemicellulose in eucalyptus chips reaches its maximum value of 48.57% when the temperature is 170 ℃, the holding time is 30min and the liquid-solid ratio is 5: 1.