Catalyst for synthesizing 5-hydroxymethylfurfural by hexose dehydration and method for synthesizing 5-hydroxymethylfurfural

Abstract

The invention discloses a catalyst for synthesizing 5-hydroxymethylfurfural by hexose dehydration and a method for synthesizing the 5-hydroxymethylfurfural by using the catalyst. The catalyst consists of iron halide and ammonium halide, and the molar ratio of the iron halide to the ammonium halide is 0.1 to 10. The synthesizing method comprises the following steps: dissolving a reaction substrate into a solvent, adding the catalyst consisting of the iron halide and the ammonium halide into the solution, reacting the solution for 0.5 hour at the temperature of between 0 and 200 DEG C, distilling and condensing the solution, performing extraction, distilling the concentrate under reduced pressure, drying the distillate and collecting a product. The catalyst of the invention overcomes the defects that the catalyst in the prior art has large toxicity and the catalytic reaction needs a large amount of organic solvent and additive. The catalyst totally shows the characteristic of a homogeneous catalyst in the reaction process, and has high catalytic activity and high selectivity; and the using amount of the catalyst can be optimized to trace so as to facilitate the separation and purification of the reaction product. The catalyst has the advantages of simple reaction system, environment friendliness, low toxicity, low production cost and easy post treatment.

Description

technical field [0001] The invention relates to a catalyst and a catalytic synthesis method, in particular to a catalyst for dehydrating six-carbon sugar to synthesize 5-hydroxymethylfurfural and a method for synthesizing 5-hydroxymethylfurfural using the catalyst. Background technique [0002] In the process of dehydration of six-carbon sugars to 5-hydroxymethylfurfural, commonly used catalysts include inorganic acids and solid acids. Wherein, a) use HCl, H 2 SO 4 or H 3 PO 4 When other inorganic acids are used as catalysts, dimethyl sulfoxide and polypyrrolidone are generally added as additives, and the reaction needs to be carried out in a two-phase system of water, methyl isobutyl ketone / 2-butanol. Under this condition, the catalytic conversion of D-fructose The reaction yield of becoming HMF is about 72% (Science 312 (2006) 1933 and Green Chem.9 (2007) 342); b) solid acid catalyst is generally metal phosphate, as when using vanadyl phosphate as catalyst, different c...

AI Technical Summary

Problems solved by technology

Use CrCl 2 When using ionic liquids as catalysts, the disadvantage is that the catalyst component CrCl 2 High toxicity, and the price of ionic liquid is expensive