Dissertation
Dissertation > Industrial Technology > Chemical Industry > Fiber quality of the chemical processing industry > Cellulose chemical processing industry

Research on the Degradation of Straw Fiber for Chemical Derivatives Development

Author ZhengBiWei
Tutor LuoYi
School Huazhong University of Science and Technology
Course Applied Chemistry
Keywords Straw Cellulose Degradation Oligosaccharides Sorbitol Ultrasonic wave
CLC TQ352
Type Master's thesis
Year 2011
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Cellulosic materials is nature's most abundant renewable resources, adequate and reasonable use of the resources is an effective means to address the energy crisis and environmental problems facing the world today . The current use of cellulose is mainly divided into two , a preparation of fuel ethanol by enzymatic hydrolysis technology , another by the high-temperature high-pressure refining biodiesel production . As a substitute for fossil energy , the form of the above two types of fuel in the heat value and the process cost are the existence of their respective shortcomings . This paper separated from the straw cellulose as raw materials, were studied under different reaction conditions , the degradation characteristics obtained under non - homogeneous conditions , cellulose supramolecular structures , Common Reagents its swelling and the degree of accessibility is limited . Therefore, under this condition the selectivity of the reaction and degradation are once are poor , insufficient to satisfy the requirements of the overall design . Taking into account the above shortcomings, the use of higher concentrations of the inorganic acid as the swelling agent of the fibers , to form a homogeneous system . Supplemented ultrasonic assisted degradation of other means , under relatively mild conditions , a degree of polymerization of the fibers can be more uniform degradation occurs to obtain the oligosaccharides of soluble fiber . And using HG-2 and HG-3 , a combination of a condensate agent fiber oligosaccharides grading condensate separation of the different degrees of polymerization . The results show that : the distribution of most of the product of the degree of polymerization between 3 to 4 , and the best preparation conditions , the yield was up to 74.2% . Further , as the raw material to fibers prepared oligosaccharides manner by catalytic hydrogenation to convert it into sorbitol , in homemade nickel-based catalyst under the conditions , the conversion rate of 64.4% . The generated alcohol products were further molecular integration technology available Alkanes C5-C30 liquid , so it is prepared by a real application prospects hydrocarbon gasoline base material .

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