Research On The Degradation And Transformation Of Chitin Biomass To Produce High Value-added Chemicals

Marine resources are abundant,but a large number of crustaceans have not been developed yet.Converting chitin biomass into high-valuable chemicals can not only bring benefits to the economy of modern society,but also have important significance for marine waste disposal and environmental protection.Chitin molecule contains valuable natural nitrogen elements,which provides raw materials for the production of high-valuable fine chemicals that contains nitrogen element.The traditional synthesis method of nitrogen-containing compounds generally through ammonia synthesis to get the product,which could cause high energy consumption,and its conversion rate is too low.What’s more,the economic efficiency is poor.And its strong side reactions cause low yield of the target product.Therefore,by optimizing the reaction conditions and increasing the conversion rate,chitin biomass can be transformed into high-valuable nitrogen-containing compounds.In this study,we prepared two types of supported catalysts with nitrogen-containing compounds,which are named silica-supported boric acid(SSBA)and Al2O3-B2O3,respectively.Both of them can form catalyst systems with chloride ionic liquids and cooperating catalyze degradation of chitin biomass monomer N-acetylglucosamine(NAG)to produce high-valuable chemical 3-acetylamino-5-acetylfuran(3A5AF),and the highest yield of 3A5AF was 62.1%and 46.4%,respectively.In addition,two kinds of heterogeneous supported catalysts showed good recyclability.Another part of the study,a new series type of tetramethyl-guanidine ionic liquids were also synthesized,which of them were used to degrade the biomass to the biomass-based platform compound 5-hydroxymethylfurfural(5-HMF)and 3A5AF,and improved the target product 3A5AF yield by optimizing reaction conditions.