A method for depolymerizing biomass and coproducing furfural, cellulose and lignin

Abstract

The invention discloses a method for co-producing furaldehyde, cellulose and lignin by depolymerizing biomasses. According to the method, in a mixed solvent of water and acetone, depolymerization andseparation of the biomasses are catalyzed in a one-step manner under the synergistic effect of phosphoric acid and sulfuric acid, the reaction temperature of furaldehyde production is effectively reduced, the reaction time of furaldehyde production is effectively shortened, energy conservation and emission reduction are achieved, the production cost of furaldehyde products is greatly reduced, highyield of the furaldehyde products is achieved, lignin components and cellulose components in biomass raw materials are efficiently separated, the purity of cellulose in residues is high, the cellulose can serve as a commodity or a raw material to be reused, and the method solves the problems that according to an existing furaldehyde production process, reaction steps are more, reaction temperature is high, reaction time is long, yield is low, and components cannot be efficiently separated.

Description

Technical field: [0001] The invention relates to the technical field of biomass energy chemical industry, in particular to a method for co-producing furfural, cellulose and lignin by depolymerizing biomass. Background technique: [0002] Furfural is an important chemical intermediate. Furfural and its derivatives have broad application prospects in the fields of solvents, resin synthesis, fragrances, cosmetics, plastics and nylon products. From the beginning of industrial production of furfural in 1922 to the present, the production process of furfural used in industry belongs to one-step production process. One-step method means that the hydrolysis of hemicellulose to pentose and the dehydration and cyclization of pentose are completed in the same hydrolysis pot. The commonly used process conditions are that the biomass is reacted at high temperature (140-185° C.) for 3-10 hours, and the amount of sulfuric acid is 3%. Limited by various conditions, the maximum yield of fur...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for depolymerizing biomass to co-produce furfural, cellulose and lignin. In a mixed solvent of water and acetone, the depolymerization and separation of biomass are catalyzed in the next step of synergistic action of phosphoric acid and sulfuric acid, so as to effectively reduce the production of furfural Higher reaction temperature and shortened reaction time, realize energy saving and emission reduction, greatly reduce the production cost of furfural products, and at the same time realize high production of furfural products and efficient separation of lignin and cellulose components in biomass raw materials, and the purity of cellulose in residues is extremely high , can be used again as a commodity or raw material, and solve the problems of many reaction steps, high reaction temperature, long reaction time, low yield and inefficient separation of components in the existing furfural production process