ENHANCED SOLUBLE C5-SACCHARIDE YIELDS Russian patent published in 2017 - IPC C07H3/06 C07H3/02 C07H1/08 C12P19/02 C12P19/04 B01J3/06 

FIELD: chemistry.

SUBSTANCE: present invention relates to a lignocellulose hydrolysis method and can be used in chemical industry. Disclosed method involves providing a fractionated lignocellulose biomass containing a fraction of solid substances, containing optionally insoluble C₅-oligosaccharide, cellulose and lignin, and a first liquid fraction at a first temperature of not more than 240 °C, containing soluble C₅-saccharides, selected from C₅-oligosaccharides, xylose, arabinose, lyxose, ribose and mixtures thereof; contacting said first liquid fraction with solid acid catalyst to form a second liquid fraction at temperature not more than 240 °C; wherein said second temperature is lower than said first temperature; where said contacting shifts molecular weight distribution of said soluble C₅-oligosaccharides to lower average molecular weight; optionally hydrolysis of said second liquid fraction using acid or enzyme to produce C₅-oligosaccharides, selected from C₅-oligosaccharides containing fewer monomer links, xylose, arabinose, lyxose, ribose and mixtures thereof; where said fractionated lignocellulose biomass is obtained by bringing said cellulosic biomass into contact with first reaction liquid, containing hot water under pressure and optionally carbon dioxide; where said first reaction liquid additionally contains acid, where said lignocellulose biomass includes soft wood; where said first reaction liquid is at temperature less than 100 °C under pressure sufficient to maintain said first reaction liquid in liquid form.

EFFECT: novel efficient lignocellulose hydrolysis method, which increases level of soluble C₅-saccharides preventing reverse condensation of soluble C₅-oligosaccharides to insoluble high-molecular weight C₅-oligosaccharides.

61 cl, 4 dwg