Method for preparing 5-hydroxymethyl furfural

Abstract

The invention discloses a method for preparing 5-hydroxymethyl furfural. In the method, biomass sugar is taken as a raw material and a biomass transformation technology is adopted. The method comprises the steps of: putting 50-150ml of ionic liquid, 6-40g of biomass sugar and 0.5-6g of catalyst with the sulfonation degree of 8-100% into a 250mol of round-bottom flask together; replacing the air with nitrogen; heating up to 140-180 DEG C by oil bath under the stirring of magnetic force, reacting for 0.5-8 hours and then cooling; and then, extracting with ethyl acetate and separating out the 5-hydroxymethyl furfural, wherein the ionic liquid is N-methyl imidazole ionic liquid, pyridine ionic liquid, amino acid ionic liquid or morpholine ionic liquid, the biomass sugar is cellulose, starch, inulin, cane sugar, glucose or fructose, and the catalyst is collaborative hybrid organic material formed by polyphenylene sulfide, sulfonic acid and sulfur ether, or collaborative hybrid organic inorganic material formed by inorganic material, sulfonic acid and metal ions.

Description

technical field [0001] The invention relates to biomass conversion technology and chemical production technology, in particular to a method for directly preparing 5-hydroxymethylfurfural by using renewable substances as raw materials. Background technique [0002] Cellulose is one of the renewable resources. The research on its hydrolysis to prepare HMF (5-hydroxymethylfurfural) is gradually attracting people's attention. 5-Hydroxymethylfurfural can synthesize high value-added products such as 2,5-furandicarbaldehyde, 2,5-furandicarboxylic acid, levulinic acid and alkanes through oxidation, hydrogenation and condensation reactions, so 5-Hydroxymethylfurfural It is considered to be a key intermediate for biomass to replace petroleum and coal in the production of organic chemicals. Although 5-hydroxymethylfurfural can be directly synthesized from cellulose, it is still mainly prepared by dehydration of fructose at present, because there are many technical difficulties in the...

AI Technical Summary

Problems solved by technology

Although 5-hydroxymethylfurfural can be directly synthesized from cellulose, it is still mainly prepared by dehydration of fructose at present, because there are many technical difficulties in the method of directly synthesizing 5-hydroxymethylfurfural

Studies have shown that in industrial production and experimental research, some commonly used heterogeneous catalysts such as sulfonic acid resins, SO 4 / ZrO 2 , sulfonic acid hybrid SBA-15, ion exchange resin, HTiNbO 5 、HTi 2 NbO 7 , HNb 3 o 8 、H 4 Nb 6 o 17 、H 2 Ti 3 o 7 , Mordenite, TiO 2 and ZrO 2 , Nb 2 o 5 / Al 2 o 3 etc., are beneficial to the preparation of 5-hydroxymethylfurfural from fructose or glucose, but these heterogeneous catalysts have low surface area, small pore size, and are difficult to disperse in solvents, which is not conducive to the full contact of macromolecular cellulose and its active sites (although solid superacid It has strong acidity, but lacks the active site to promote the isomerization of glucose to fructose), so although it has been widely used in the process of fructose dehydration to prepare 5-hydroxymethylfurfural, it is difficult to realize the direct conversion of cellulose to prepare 5- The purpose of hydroxymethylfurfural