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Process, Mechanism And Application Reasaerch About Comprehensive Utiliztion Of D.zingiberensis

Posted on:2009-10-17Degree:DoctorType:Dissertation
Country:ChinaCandidate:F HanFull Text:PDF
GTID:1101360242488152Subject:Chemical Engineering
Abstract/Summary:PDF Full Text Request
As the main active ingredient of D.zingiberensis, Diosgenin is the important intermediate for the synthesis of steroid hormone medicine. But, there are so many disadvantages in the traditional process of the diosgenin production, such as the low extraction rate of diosgenin and lots of wastewater. The diosgenin acidic wastewater causes significant damage to the surrounding environment.This study put the main emphasis on the methods and ways of comprehensive utilization of D.zingiberensis as resource materials, in order to reduce acidic waste water and waste slag generated radicaly in the process of diosgenin production, aims to increase the economic efficiency with by-products, and provide new ideas and methods for the development of D.zingiberensis industry.A new Pre-separation of Starch Process and optimization coditions were obtained, which through pre-separation starch, hydrolysis and extraction to produce diosgenin from D.zingiberensis. Meanwhile the separation process of cellulose from D.zingiberensis was discussed, and Pre-separation of Starch and Cellulose Process was obtained. Through histocytology and experiment courses, the separation and combination principle of starch, cellulose and diosgenin in the D.zingiberensis were analyzed and discussed.The industrialization of Pre-separation of Starch Process was studied. Compared with traditional process, the yield of diosgenin was increased by 8%, the consumption of hydrochloric acid and sulphuric acid reduced by 18% and 5% respectively, and 90.06 kg of starch was obtained from one ton of fresh D.zingiberensis. The discharge amount of wastewater decreased by 63.3%, COD declined by 68.5%, chroma of it reduced by 59.6%. The process has greater profit through the consumption of raw materials and products-benefit analysis.The research results reached the level of industrial production, and achieved the target of environmental pollution improvement and getting some profits.Physicochemical property of D.zingiberensis starch and cellulose were detected and analyzed through Scanning Electronic Microscope, Laser Particle Size Analyser, X-Ray Diffractometer,Differential Scanning Calorimetry and Infrared Spectrum Analysis. Through testing the proteins, amino acids, minerals of D.zingiberensis starch, its nutritive value was discussed, through toxicology experiments, its safety was measured.A new preparation method of organic fertilizer with waste-water and waste slag generated in the traditional production process of diosgenin was studied, and preparation methods of four crops special organic fertilizer also were obtained, all these products complied with the organic fertilizer standards NY525-2002. These methods can not only reduce environmental pollution, but also bring about certain economic benefits.In order to minimize acid waste-water generated in the production process of diosgenin, a new process of ethanol extracting and hydrochloric acid hydrolyzing was provided to extract diosgenin. Six different extracting methods were studied and compared, and the reaction mechanism was discussed. The grinding starch and ultrasonic extracting method was proved more efficient. By response surface methodology, the parameters of extraction process were optimized, the optimal process parameters and fitted regression equation were obtained. The molecular structure of the products were detected and determined. Compared with the traditional process, yield of diosgenin was raised by 25.1 percent, the consumption of hydrochloric acid reduced by 90%, and the consumption of petroleum benzine decreased by 60%, and the production was much purer. The method has some advantages such as higher efficiency, energy-saving and low pollution.In order to reduce chroma of waste-water generated in the production process of diosgenin and improve the level of comprehensive utilization of D.zingiberensis, extracting process of D. zingiberensis yellow pigment was studied. The research of refining, identification and stability of oil pigment were conducted. And the adsorption process of water pigment with macropore resin was studied, the absorption isotherm, dynamical equation and thermodynamic parameter of dsorption process were researched and discussed.A systematic and comprehensive study was made to have comprehensive utilization of D.zingiberensis, and solve the problem of high pollution and energy consumption, low availability of resources and production efficiencies in the current D.zingiberensis industry. It has a high environmental, economic and social benefits, and broad prospects.
Keywords/Search Tags:D.zingiberensis, Comprehensive utilization, Diosgenin, Starch, Yellow pigment, Industrialization, Characterization
PDF Full Text Request
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