Hydrolysis Of Carbohydrate Into5-hydroxymethylfurfurfural Catalyzed With Solid Catalyst

Biomass has the advantages of low cost, wide source, species rich and it is ideal green and renewable energy. So it can be used as an alternative to petrochemical resources and it is the effective way to solve the problem of energy and environment.5-hydroxymethylfurfurfural is regarded as the new platform chemical and it can be used to product polymer synthesis of high temperature resistance, fluorescent materials, pharmaceutical intermediates and a series of liquid fuel.So the study of preparation of5-HMF from the biomass has high value.The current research focus is the hydrolysis of glucose into5-hydroxymethylfurfurfural. The study found Cr salt has good catalytic effect one hydrolysis of glucose into5-hydroxymethylfurfurfural, but the catalyst is not easy separation and recycling and pollute the environment. In this paper, I tried to apply the zeolite modified with Cr into the reaction hoping to recycle the catalyst and reduce the pollution for the environment.This paper examined the effect of concentrations, reaction time, reaction temperature, solvent, the amount of catalyst and water content on the conversion of fructose and the yield of5-HMF. The results showed that a 85.81%yield of5-HMF was reached and a99.81%conversion of glucose when the reaction was catalyzed by Hβ at160℃after7h, using DMSO as the solvent.This paper examined the effect of concentrations, reaction time, reaction temperature, solvent, the amount of catalyst and water content on the conversion of glucose and the yield of5-HMF. The results showed that a35.51%yield of5-HMF was reached and a86%conversion of glucose when the reaction was catalyzed by Cr-HP at160℃after7h, using DMSO as the solvent.The study showed that hydrolysis of glucose included two steps: isomerization of glucose into fructose and fructose dehydration into5-HMF. The isomerization of glucose to fructose was an the alkali catalyzed process. In this paper, solid alkali ZrO2and Cr-H(3was used as the catalysis to examined the effect of catalyst type, catalyst amount, reaction time and catalyst addition time on the conversion of glucose and the yield of5-HMF. The results showed that a45.5%yield of5-HMF was reached and a90%conversion of glucose when the reaction was catalyzed by ZrO2and Cr-H(3at160℃after7h, using DMSO as the solvent. Under the same conditions, the yield of5-HMF can be reached68.8%and10%in the conversion sucrose and maltose after7h, and the yield of5-HMF can be reached8%on the conversion starch after15h.The result of reaction kinetics constants of hydrolysis of glucose into 5-HMF catalyzed with solid catalys ZrO2å'ŒCr-Hβ is that the value k1is increased from0.0261to0.3486. A reaction rate equation for hydrolysis of glucose into5-HMF is R1=3.56×108·Cglu,0·exp (-11.35x1000/RT)...