Furfural Coupling Reaction And Chitosan Degradation Reaction Research

As a highly abundant and carbon-neutral renewable energy resource,biomass resources are abundant in source,cheap in price,environmentally friendly and reproducible,which made them to be an ideal substitute for fossil fuels.Furaldehydes,particularly furfural(FF)and 5-hydroxymethylfurfual(HMF)are considered to be two of the most value-added biomass building blocks or platform chemicals,can be transformed into more high value-added chemicals.The main contents of this paper are listed as follows:In the first chapter,we introduced the current development of biofuels from biomass and the platform molecules derived from biomass.Then,we reviewed the lasted development of the preparation methods and representative application examples of platform molecules furfural and HMF.Finally,the catalytic system progress of this paper is introduced.In the second chapter,we present a new route about the upgrading of furfural to furoin.Furural has a widely source,and can be translated into all kinds of chemicals and fuels forebody.The reaction was using thiazole acetate ionic liquid,which in the reaction system formed NHC catalyst,to realize the self-coupling of furfural and obtained the highest yield of 93.02%furoin.The effect of different solvents on the reaction was investigated.It was found that a high yield could be obtained under the solvent free condition.Meanwhile,the effects of different thiazole ionic liquids on the yield were studied.It was found that the groups of thiazole ring were different,and the catalytic activity of ionic liquids would be quite different.In the third chapter,a synthesis method of ionic liquid benzimidazole hydrogen sulfate was introduced,and its structure was characterized.The benzimidazole hydrogen sulfate ionic liquid was used for the study of catalytic degradation of chitosan into 5-HMF,and the reaction conditions were optimized,to explore the influence of reaction temperature,catalyst dosage,reaction time and if need solvent on the reaction.Finally the optimal reaction conditions for the reaction were found,and the highest yield of HMF was 29.1%.Compared with the traditional method,the method has several characteristics,such as simplicity of operator,the catalyst can be recycled,and environment-friendly.In the forth chapter,we present the summary of this paper.In conclusion,this thesis mainly foucsed on the conversion of biomass derived platform molecules of furfural into different chemicals through different catalytic systems,the performances of different catalysts with different activities and the influence on the products were studied and explored.Through the development of new catalytic systems,more applications of platform molecule will be present.