Method used for effective conversion of carbohydrate into 5-hydroxymethylfurfural in pure water

Abstract

The invention relates to an effective catalyst system used for preparing 5-hydroxymethylfurfural from carbohydrate in pure water phase. According to the effective catalyst system, a fluorine-containing protonic acid is taken as a catalyst, wherein the mass of the fluorine-containing protonic acid accounts for 0.2 to 5% of the mass of the carbohydrate raw material; water is taken as a solvent; reaction temperature ranges from 60 to 100 DEG C; reaction time ranges from 2 to 16h; and the carbohydrate can be transformed into 5-hydroxymethylfurfural effectively. Reaction conditions of the catalyst system are mild; operation is sample; and reaction is rapid.

Description

Technical field [0001] The invention involves the field of 5-hydroxymamoidamal formation by carbohydrates, and specially involves an effective catalytic transformation method for preparing 5-hydroxyamal bran in pure water under mild conditions under mild conditions. Background technique [0002] With the increasingly exhausted fossil resources, the world is breeding a large transfer of resources with biological renewable resources instead of fossil resources. The use of biomass as renewable carbon resources will be the fundamental material basis for the sustainable development of human civilization.Biomass renewable resources-wood fiber raw materials are transformed into high-value fine chemicals, new energy and new materials with high value, which has attracted great attention from scientific researchers in various countries.Very important chemical raw materials, its molecules contain a aldehydes and a hydroxyl group, which can be used to synthesize many useful compounds and new...

AI Technical Summary

Problems solved by technology

[0003]5-Hydroxymethylfurfural (5-HMF) is an acid-catalyzed reaction product of carbohydrates. Some traditional methods use HCl, H2 Acids such as SO4, HNO3, H3PO4 are used as catalysts, dimethyl sulfoxide (DMSO) , dichloromethane (DCM), methyl isobutyl ketone (MIBK) and other organic solvents as the reaction medium, the amount of catalyst added is about 10% of the raw material mass, and the yield of 5-HMF is 15% to 30%. These traditional The method has disadvantages such as low catalytic activity, use of toxic organic solvents, and harsh reaction conditions (the temperature is generally 140~200°C) (Green Chemistry, 2007, 9 (4):342-350; Carbohydrate Research, 2005, 340 (12): 1925-1930)

[0004] In order to increase the yield of 5-HMF, recently Joseph B. Binder (J. Am. Chem. Soc., 2009, 131(5): 1979-1985) , Zehui Zhang (Biores. Technol., 2010, 101: 1111-1114), etc. successively reported that using ionic liquid as solvent, at a temperature above 120°C, using Lewis acid CrCl3 is a catalyst that catalyzes the conversion of cellulose to 5-HMF, and its yield reaches 54%-62%. Other Lewis acid catalysts such as FeCl3, SnCl4, AlCl 3, CuCl2, ZnCl2, etc. in ionic liquids or water-organic mixed solvents such as H2O- There are many reports on the preparation of 5-HMF from carbohydrates in DMSO, H2O-MIBK. Although these metal chlorides can effectively catalyze the conversion of carbohydrates to 5-HMF, some of them such as The most effective CrCl3 has strong toxicity. The ionic liquid or water-organic mixed solvent used is not only expensive, but also some organic solvents have certain toxicity, and some corrosion equipment, the product is difficult to separate, It is difficult to recover organic solvents (Green Chem, 2011, 13: 754), and the reaction temperature is relatively high (above 120°C), making it difficult to realize industrialization

As far as we know, there is no report on the catalytic system that can effectively convert fructose, especially glucose, cellulose, etc. into 5-HMF in pure water and mild temperature. The effective preparation of 5-HMF from fructose, glucose, sucrose, cellulose, starch, wood fiber and other carbohydrates has important industrial application value

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