稻草纤维降解技术及其衍生产品的开发-应用化学专业论文.docxVIP

华中科技大学硕士学位论文 华 中 科 技 大 学 硕 士 学 位 论 文 II II Abstract Cellulosic material is one of the most abundant renewable resources in nature. It is an effective mean to sovle the energy crisis and environmental problems we faced in the world. Current research about utilization of cellulose can be mainly divided into the following two forms. One is the fuel ethanol preparation by cellulose enzyme hydrolysis, and the other is the biodiesel production preparation by high temperature and high pressure refining methods. But both two fuel forms above have their own defects about the Calorific value， technic procedures and the high cost structure. Cellulose, isolated from straw, was used as raw material and its degradation characteristics in different reaction conditions was investigated in this paper. The results concluded that the swelling and accessibility of super-molecular structure of cellulose are limited with the help of ordinary reagent in the heterogeneous phase conditions. Therefore, the selectivity of the reaction and purity of the production can not satisfy the overall design requirements. Considering the shortage above, the inorganic acid with high concentration was adopted to solve the cellulose in order to form a uniform system. In addition, with the help of ultrasonic auxiliary degradation, the water-soluble fiber oligosaccharides can be obtained from straw, which can be seperated with the help of combined HG-2 and HG-3 type condensation agents according to different degree of polymerization. The degree of polymerization of most production changes from 3 to 4, and the productivity can up to 74.2% in the optimized condition. Additionally, the product has been transformed into sorbitol, through further catalysis hydrogenation using homemade Ni-based catalysts, and the conversion rate also can reach 64.4%. C5~ C30 of liquid alkane can be produced by the generated sorbitol through further molecular integration technology. Hence, it is an excellent origin materi