FIELD: chemistry.
SUBSTANCE: invention relates to processing lignocellulose biomass, particularly fractionation thereof to obtain cellulose and hemicellulose in an amorphous form, followed by conversion thereof to highly concentrated mixtures of five- or six-carbon sugars, as well as to a system of devices for fractionating biomass. The lignocellulose is boiled with polyphosphoric acid at 40-120°C for 30-240 minutes. Cellulose and hemicellulose are precipitated by dissolving lignin with a solvent. The dissolved lignin is separated from the precipitated cellulose and hemicellulose. The solvent is removed from the mixture of cellulose and hemicellulose under the action of steam at 60-120°C, a vacuum or a mixture thereof. The solvent used is methanol, ethanol, 1-propanol, 2-propanol, acetone, propanal, 1-butanol, 2-butanol, butonal, butanone (methyl ethyl ketone), t-butanol and water.
EFFECT: moderate treatment conditions and a low ratio of solvent to solid phase ensure relatively low capital expenditure and treatment costs.
13 cl, 6 dwg
