Method for preparing furfural through ionic liquid catalysis

Abstract

The invention discloses a method for preparing furfural through catalysis of ionic liquid, and relates to the field of furfural preparation. The method comprises the following steps: mixing carbohydrate, a composite solvent and an acid bifunctional ionic liquid catalyst; and carrying out catalytic reaction on the mixture at 120-200 DEG C for 60-300 minutes to synthesize furfural. The carbohydrate is monosaccharide, disaccharide, polysaccharide or biomass rich in pentose monomers; wherein the composite solvent is composed of water and a ketone organic solvent; the acid bifunctional ionic liquid catalyst is a compound composed of metal halide anions having Lewis acidity and imidazolyl cations having acidity. The reaction system is economical and environment-friendly, the operation conditions are mild, the complexity of the technology for preparing furfural from pentose monomer source carbohydrate is effectively simplified, and the furfural preparation cost is greatly reduced under the condition that the preparation efficiency is equivalent to that of the prior art.

Description

technical field [0001] The invention relates to the field of furfural preparation, in particular to a method for preparing furfural by catalyzing an ionic liquid. Background technique [0002] As the only renewable carbon-based resource, biomass can be used to produce a variety of fine chemicals or fuels, thereby reducing dependence on oil and coal resources, which is of great significance to China's energy security and environmental protection. There are a wide variety of biomass, among which lignocellulosic biomass occupies a dominant position in both distribution and reserves, and is also the main object of current research. [0003] For lignocellulosic biomass, cellulose, hemicellulose, and lignin are the three main components of biomass and the main components of plant cell walls. The combination of cellulose and hemicellulose or lignin molecules mainly depends on hydrogen bonds, and there are chemical bonds between hemicellulose and lignin in addition to hydrogen bond...

AI Technical Summary

Problems solved by technology

Among them, water is used as the reaction solvent, which can easily lead to the occurrence of other side reactions, and may produce humin, an insoluble solid by-product, which reduces the yield of furfural

Moreover, the metal ionic liquid heteropolyacid catalyst used in it, in the polar reaction system, the metal ions are easy to fall off, resulting in the collapse of the catalyst structure, which is not conducive to the catalytic reaction