Method for preparing 2,5-furandicarboxylicacid

Abstract

The invention discloses a method for preparing 2,5-furandicarboxylicacid. The method comprises the steps that a reaction substrate and a catalyst are added in a system, wherein the reaction system iscomposed of water and a biomass-base solvent; in a certain of oxidizing atmosphere, the product 2,5-furandicarboxylicacid is obtained through high-temperature hydrolysis, isomerization, dehydration and oxidization, wherein the biomass-base solvent is one or two or more of gamma-valerolactone, ethyl acetate and methyl levulinate; the reaction substrate is one or two or more of cellulose, cellobiose, glucose and fructose; the catalyst is one or two or more of Ru / C, Pt / C, Pd / C, Rh / C, Cu / C, Ni / C and Co / C; the oxidizing atmosphere is one or two of oxygen and air. In the method, the water and the biomass-base solvent serve as reaction media, the reaction efficiency is high, the water and the biomass-base solvent do not interfere with each other, the product is helped to be obtained through recrystallization, and a good idea and method are provided for preparing common chemicals. The preparation process is environmentally friendly, and the method is environmentally friendly and high in operability.

Description

technical field [0001] The present invention relates to a relatively large scope, in particular to a method for preparing 2,5-furandicarboxylic acid. Background technique [0002] 2,5-furandicarboxylic acid has the potential to replace terephthalic acid and fatty acids, and can be used as a monomer for polyesters and polyamide esters, and is an important renewable platform compound. Compared with ethylene terephthalate polymer, ethylene furandicarboxylate polymer has more excellent mechanical properties, higher glass transition temperature and tensile coefficient. Ethylene furandicarboxylate polymer can be used to prepare water cups, food packaging boxes, sports equipment, etc., and has very broad and potential uses. Therefore, the preparation of 2,5-furandicarboxylic acid has attracted the attention of many scientific researchers. [0003] The traditional method for preparing 2,5-furandicarboxylic acid is to selectively dehydrate fructose to generate 5-hydroxymethylfurfura...

AI Technical Summary

Problems solved by technology

[0004] Although oxidation of 5-hydroxymethylfurfural in water can obtain 2,5-furandicarboxylic acid in high yield, there are many potential problems in this method. The reaction process of fructose dehydration in water to obtain 5-hydroxymethylfurfural is inhibited, and 5 -Hydroxymethylfurfural is unstable in the water system. Another important reason is that the solubility of 2,5-furandicarboxylic acid in water is poor. It is necessary to add a small amount of alkali to promote the dissolution of 2,5-furandicarboxylic acid to prevent Precipitation of 2,5-furandicarboxylic acid on the catalyst deactivates the catalyst

Dimethyl sulfoxide and γ-valerolactone can promote the dehydration of fructose to produce 5-hydroxymethylfurfural. However, these solvents have high boiling points, and 2,5-furandicarboxylic acid will react with the solvent during the high-temperature distillation separation process.

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