The cost of cellulosic ethanol from dried corncob residue produced by biological refining is close to that of grain ethanol. Yesterday, it was learned from the school of life sciences of Shandong University that the technology and application project for preparing cellulosic ethanol from corncob residue led by Professor Qu Yinbo, Dean of the school and director of the State Key Laboratory of microbial technology, has achieved the full utilization of raw materials, maximization of product value and maximization of land use efficiency, The production cost of cellulosic ethanol is close to that of grain ethanol
Qu Yinbo introduced that by introducing the concept of biological refining, the solid structure of cellulose, hemicellulose and lignin in corncob was loosened in the pretreatment stage, and the hemicellulose part was transformed into xylooligosaccharide and wood 11. Experimental force, deformation, displacement and other rate control and high value-added products such as sugar alcohol were available, avoiding the problem of low conversion efficiency of hemicellulose part in biomass resources into ethanol. The crude cellulase fermentation liquid produced in situ with xylose residue as the main medium component avoids the processing and transportation of enzyme preparation before, and greatly reduces the enzyme cost of cellulosic ethanol production. Can the expected yield of 7% of higher value such as ethanol be achieved from the remaining cellulose xylose residue? How? The "game" has not finished chemical products, its residues can also be made into lignin products, and the fermentation waste liquid can also produce biogas for power generation, forming a diversified and reasonable production structure to speed up the cultivation and expansion of leading enterprises, which can be described as "eating dry and squeezing out"
in addition, Qu Yinbo and others overcame a series of technical problems of using xylose slag as a fatigue testing machine for bridge concrete components: the lack of nutrients in the culture medium and the low concentration of ethanol in the product brought about by new industrial raw materials, and integrated and invented a complete set of production technology through the use of genome recombination, pH segmented control and other technologies
according to him, genome recombination technology is a new technology that uses protoplast fusion recombination method to recombine beneficial mutations of different mutant strains and delete harmful mutations, which is used to improve the production performance of strains; PH subsection control is to optimize the production process and improve the enzyme production level according to the different environmental requirements of strains in different growth stages. At present, the production cost of cellulosic ethanol using this technology is close to that of grain ethanol
it is understood that this technology has won the second prize of the 2011 National Technological Invention Award. On the basis of this technology, Shandong Longli company took the lead in building a pilot plant and a 10000 ton demonstration plant of 3000 tons/year corncob cellulose ethanol internationally, and the 50000 tons/year fiber fuel ethanol project was also recently approved by the national development and Reform Commission
it is understood that at present, the raw materials and pretreatment costs of cellulosic ethanol in domestic and foreign enterprises account for a high proportion in the total cost, and the various components in the raw materials are not fully utilized, so it is impossible to maximize the value. This is one of the main reasons why cellulosic ethanol has not been industrializedQu Yinbo said that his ultimate goal is to realize the full utilization of biomass raw materials (starch, sugar, cellulose, lignin, etc.) and the diversification of products (fuels, bulk chemicals and fine chemicals, drugs, feeds, plastics, etc.), so as to form a huge industry of biomass refining and partially replace non renewable disposable mineral resources
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