METHOD OF PROCESSING BIOMASS INTO CELLULOSE AND SOLUTION OF LOW-MOLECULAR WEIGHT OXIDATION PRODUCTS (VERSIONS) Russian patent published in 2014 - IPC D21C3/00 D21C3/04 C10G1/00 B01J37/04 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of obtaining cellulose and low-molecular weight oxygen-containing compounds from processing biomass from forestry and agricultural wastes. The method of processing biomass involves heating water to 58-75°C, adding FeCl₃ × 6H₂O, holding the solution at 58-75°C for not less than 10 minutes while stirring continuously. After complete precipitation of Fe³⁺, the biomass is added with ratio of water to biomass of 10-20; the mixture is stirred and held for not more than 10 hours. Hydrogen peroxide is then added with ratio of hydrogen peroxide to biomass of 3.5:0.5; the mixture is stirred at temperature of 25-70°C until hydrogen peroxide is exhausted. The obtained oxidate is separated into a solid precipitate and a solution of water-soluble products. The solid precipitate is washed with water, which is then used in the next cycles and/or is added to the aqueous solution of water-soluble products. Versions of the method involve further addition of 1-10% lower alcohol to water and/or addition of soda to FeCl₃ × 6H₂O with weight ratio of iron chloride and soda of 1.5-80. Versions of the invention enable to combine synthesis of a catalyst and oxidative processing of biomass in a single cycle (reactor). Output of water-soluble products and solid precipitate (cellulose) can be controlled depending on the ratio of the catalyst and the biomass. The water-soluble products contain organic acids and polyphenols, which can be used as preservatives and biological additives in producing feedstuff in agriculture.

EFFECT: reducing water consumption by about an order, as well as consumption of energy and components.

15 cl, 1 tbl, 9 ex