Method for generating 5-hydroxymethylfurfural by using ionic liquid catalysis

Abstract

The invention discloses a method for generating 5-hydroxymethylfurfural by using ionic liquid catalysis, which comprises the following steps: dissolving a reaction substrate into an organic solvent, and adding ionic liquid in an amount of 5 to 20 percent based on the total mole of the reaction substrate; and reacting the mixture for at least 2 hours at the temperature of between 70 and 120 DEG C under the protection of inert gas, namely neutralizing the reaction solution, and filtering, drying and distilling the reaction product to obtain the 5-hydroxymethylfurfural. The reaction system shows the characteristic of homogeneous reaction during catalytic dehydration, and has high catalytic activity and selectivity; and the using amount of a catalyst can be optimized to trace so as to improve the reaction conversion rate, reduce the use of other organic solvent and additive, reduce the cost and facilitate the separation and purification of the reaction product at the same time.

Description

technical field The invention relates to a method for synthesizing 5-hydroxymethylfurfural, in particular to a method for catalyzing and generating 5-hydroxymethylfurfural by using an ionic liquid. Background technique With the increasingly serious energy crisis and environmental pollution, people pay more and more attention to the development and utilization of renewable resource biomass. At present, the dehydration synthesis of 5-hydroxymethylfurfural (HMF) using fructose or glucose as raw material has become one of the research hotspots. HMF is an important intermediate in the synthesis of industrial organic chemicals. As a "universal" platform, it can synthesize new polymer materials and many polymers through hydrogenation, oxidative dehydrogenation, esterification, halogenation, polymerization, hydrolysis and other reactions. Value-added products are widely used as medicine, resinous plastics and fuel additives, etc., making it expected to become a breakthrough point i...

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Problems solved by technology

U.S. Patent No. 4,740,605 reports a method for synthesizing 5-hydroxymethylfurfural from an aqueous solution of a sugar compound using an inorganic acid as a catalyst for high-temperature catalysis; Patent No. 7,317,116B2 reports the process of using Amberlyst35 to catalyze fructose solution to synthesize 5-hydroxymethylfurfural and its purification method; In the above-mentioned catalytic system, the disadvantage of using solid acid or inorganic acid as catalyst is that it can only be applied to the catalytic dehydration process of D-fructose, and a large amount of organic solvents and additives need to be added; more toxic

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