A method for preparing 5-hydroxymethylfurfural

Abstract

A method for preparing 5-hydroxymethylfurfural, that is, adopting a double-acid catalyst to catalyze biomass sugar to prepare 5-hydroxymethylfurfural, is characterized in that the acidic quaternary ammonium salt cation and Lewis A bis-acid compound composed of acidic inorganic anions is used as a catalyst, and the purpose of increasing the yield of HMF is achieved by utilizing the adjustable acid strength and synergistic catalytic effect between the two. The reaction conditions are: the volume ratio of water to organic solvent is 1:5 to 1:20, the mass ratio of catalyst to biomass sugar (fructose, glucose, sucrose) is 1:2 to 1:10, and the reaction temperature is 160°C to 220°C. Under the condition of reaction time 5min-60min, HMF was prepared. Compared with the prior art: 1. The catalyst has unique catalytic characteristics, and the catalytic performance is stable, easy to separate, and reusable. 2. The process is simple and the discharge of three wastes is small. 3. The raw material biomass sugar has a wide range of choices, and cheap sucrose and other biomass sugars can be used as reactants to produce high value-added products.

Description

technical field [0001] The present invention involves the use of Biacid-type ionic liquids catalyze the dehydration of biomass sugar to prepare 5-hydroxymethylfurfural, which involves the use of A new method for efficiently converting biomass sugars such as fructose, glucose, and sucrose into 5-hydroxymethylfurfural catalyzed by bis-acid ionic liquids. Background technique [0002] 5-Hydroxymethylfurfural (HMF) is an important new platform compound, which can prepare hundreds of chemicals through reactions such as hydrogenation, dehydrogenation, esterification, halogenation, polymerization and hydrolysis, and is widely used in medicine , Resin plastics, diesel fuel additives, etc. Biomass such as starch and cellulose can be hydrolyzed to produce biomass sugars such as glucose and fructose, and then dehydrated to prepare HMF. Commonly used catalysts for the preparation of HMF include acids, solid acids, ion exchange resins, and the like. Traditional acid catalysis has p...

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Problems solved by technology

Traditional acid catalysis has problems such as many side reactions, low product yield, complex product separation operation, corrosion equipment and large environmental pollution; the preparation cost of heterogeneous catalysts such as solid superacids is high, easy to be poisoned and deactivated by coking; ions Exchange resin catalysts have problems such as easy loss during separation, poor preparation reproducibility, and high mass transfer and diffusion resistance, which limit their application in the preparation of HMF.

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