Method for preparing 5-hydroxymethylfurfural from carbohydrate

Abstract

The invention discloses a method for preparing 5-hydroxymethylfurfural from carbohydrate. In the method, metaphosphoric acid is used as a catalyst, carbohydrate including glucose, levulose, sucrose and the like can be converted into 5-hydroxymethylfurfural with high yield in an ionic liquid-water or sodium chloride solution-organic phase diphasic system at a reaction temperature of 100-200 DEG C within the reaction time of 2-30h. The method disclosed by the invention has the advantages of mild reaction conditions, simpleness in post-treatment and easiness in realizing industrialization. The selected catalyst has a good catalysis effect on the sucrose, the levulose and the glucose and is also suitable for various reaction systems such as the ionic liquid-water or sodium chloride solution-organic phase diphasic system and the like. The catalyst has the good catalysis effect particularly for the glucose so as to have a higher industrial value.

Description

technical field [0001] The invention relates to a method for preparing 5-hydroxymethylfurfural, in particular to a method for preparing 5-hydroxymethylfurfural from carbohydrates, and belongs to the technical field of fine chemical preparation. Background technique [0002] In recent years, 5-hydroxymethylfurfural, as a platform compound for converting biomass into fine chemicals and liquid fuels, has become a research hotspot in the fields of energy and chemistry. Starting from 5-hydroxymethylfurfural, liquid fuels, solvents, liquid alkanes, macromolecular monomers, furan resins, furan drugs, levulinic acid and other fine chemicals can be further synthesized, which provide for the biorefinery of carbohydrates a new way. [0003] The research on the conversion of carbohydrates into 5-HMF began as early as the end of the nineteenth century. In 1895, Dull G. et al. reported for the first time that heating an aqueous solution of inulin and oxalic acid under a certain pressure ...

AI Technical Summary

Problems solved by technology

Although there are many and mature reaction systems for converting fructose into 5-HMF, the yield is also high, but the price of fructose is relatively high, which is not conducive to the large-scale production of 5-HMF, and it is necessary to find cheap raw materials

Glucose is a relatively cheap sugar, and the catalytic yield of chromium salt can be as high as 70-80%. However, a large amount of chromium salt will pollute the environment and cannot realize industrialized large-scale production.

How to effectively and non-pollutingly convert carbohydrates into 5-hydroxymethylfurfural is still an unsolved problem so far

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