Method for preparing 5-hydroxymethylfurfural by taking cellulose as raw material

Abstract

The invention discloses a method for preparing 5-hydroxymethylfurfural by taking cellulose as a raw material, which comprises the steps of: pretreating a biomass material rich in the cellulose by utilizing acid or alkali, neutralizing the biomass material, filtering to remove hemicellulose and lignin, washing obtained cellulose filter residue with water, and drying the cellulose filter residue; mixing the cellulose filter residue or pure cellulose with the water, loading the mixture into a high-pressure reactor, sealing the high-pressure reactor, and injecting liquid carbon dioxide into the reactor for reaction; and separating supercritical carbon dioxide dissolved with the 5-hydroxymethylfurfural through a separator during the reaction, discharging the 5-hydroxymethylfurfural from the bottom of the separator, and obtaining a 5-hydroxymethylfurfural product through drying, dehydration and crystallization. The method has the advantages of high selectivity, suitable continuous production, high product content, green and environment-friendly process, and easy industrialized production.

Description

technical field

[0001] The invention relates to a method for preparing 5-hydroxymethylfurfural from cellulose-rich biomass. technical background

[0002] The huge demand for energy around the world, the instability of oil production, and global warming have once again stimulated people's interest in renewable energy. Biofuels have become the primary "new force" and have attracted the attention of researchers at home and abroad. The reserves of biofuels are huge. It is estimated that the annual energy stored in plants is about 10 times that of the world's main fuel consumption, while the utilization of energy as energy accounts for less than 1% of the total.

[0003] The currently widely used biofuels are ethanol and biodiesel, among which the annual production of ethanol in the United States and Brazil both exceeds 10 million tons. With the increase of ethanol production, the production of bioethanol using sugar or grain as raw material is limited by food resources, and it ...