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

Abstract

The invention discloses a method for preparing 5-hydroxymethylfurfural by taking glucose as a raw material, which comprises the steps of: mixing the glucose with water according to the mass ratio of 1: 3-10, loading the mixture into a high-pressure reactor, sealing the high-pressure reactor, increasing the reaction temperature to be between 120 and 250 DEG C, injecting liquid carbon dioxide into the reactor, and controlling the pressure to be between 10 and 25MPa; performing the separation of carbon dioxide and a product on supercritical carbon dioxide with the product dissolved therein through a separator during the reaction, and controlling the separation pressure to be between 5 and 8MPa and the separation temperature to be between 25 and 70 DEG C; and discharging the product 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 of the 5-hydroxymethylfurfural, 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 the integrated preparation of 5-hydroxymethylfurfural by using glucose as a raw material and adopting supercritical phase reaction separation. 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 bio...

AI Technical Summary

Problems solved by technology

Since the 5-hydroxymethylfurfural molecule contains a furan ring and an aldehyde group, its chemical properties are relatively active, and it is extremely unstable in acid-base, high temperature, and polar environments, and it will further dehydroxymethyl to form furfural or ring-opened Other substances such as levulinic acid lead to extremely low selectivity and yield of 5-hydroxymethylfurfural, which cannot meet the production requirements