Method for preparing 5-ethoxyl methylfurfural

Abstract

The invention relates to a method for preparing 5-ethyoxyl methylfurfural, which comprises the following step: carrying out etherification reaction by taking 5-hydroxymethylfurfural as a reaction substrate and a sulfonic acid type high-molecular nitrogen-containing polymer as a catalyst to obtain the 5-ethyoxyl methylfurfural. The method has the advantages of mild reaction conditions, short reaction time, simple process, high catalytic etherification efficiency, few byproducts, high product selectivity and low production cost; the sulfonic acid type high-molecular nitrogen-containing polymer catalyst used in the invention has high activity; according to a preferable scheme, the catalyst is simple in preparation process and low in preparation cost.

Description

technical field [0001] The invention relates to the field of biomass energy chemical industry, in particular to a method for preparing 5-ethoxymethylfurfural. Background technique [0002] With the depletion of non-renewable energy such as fossil fuels and the increasing demand for energy, the development and utilization of green and renewable new energy has become a top priority. [0003] Biomass is the only renewable organic carbon resource in nature, which can be converted into high value-added chemicals and biofuels through chemical pathways. The research and development of biomass fuels and the promotion of green and sustainable technology are of great strategic significance for the replacement of fossil resources. [0004] 5-Hydroxymethylfurfural (HMF) is an important platform molecule connecting carbohydrates and biomass fuels, and can be converted into various fine chemicals through oxidation, reduction, etherification and other reactions. 5-Ethoxymethylfurfural (E...

AI Technical Summary

Problems solved by technology

[0005] At present, most of the methods for preparing EMF from biomass-based HMF etherification have long reaction time, complex catalyst preparation, poor reaction selectivity, and difficult separation of products, and many of the catalysts used are solid acid catalysts.

For example, Yu et al. used lignosulfonate-based acidic carbonaceous catalysts (LS-SO 3 H) Catalyze HMF to synthesize EMF, and obtain 85.5% yield at 80°C and 11h, but the reaction time of this method is longer (see One-step fabrication of carbonaceous solid acid derived from lignosulfonate for the synthesis of biobased furanderivatives, RSC Advances, 2018, August, 15762-15772)

Preparation of fructose-derived carbon-based magnetic sulfonic acid catalyst (PCM-SO 3 H), in the ethanol system, the substrate is 5-HMF, and the 5-EMF yield is 85.6%, but the reaction time of this method is also long and the catalytic efficiency is low (see Magnetically-recoverable carbonaceousmaterial:an efficient catalyst for the synthesis of 5-hydroxymethylfurfural and 5-ethoxymethylfurfural from carbohydrates, Russian Journal of General Chemistry, 2016, 86, 1698-1704.)

YIN et al. synthesized 5-EMF by reacting 5-HMF at 100°C for 12 hours through free radical oligomerization of bisvinylimidazolium salt on the surface of mercaptopropyl-modified silica, and the yield of 5-EMF was 89.6%. , but the catalyst preparation process used in this method is complicated, the conditions are difficult to control and the reaction time is long (see Magneticmaterial grafted cross-linked imidazolium based polyionic liquids: efficient acid catalyst for the synthesis of promising liquid fuel 5-ethoxymethylfurfural from carbohydrates, Journal of Materials Chemistry A, 2015, 3, 4992-4999)