METHOD OF OBTAINING XYLOSE AND CELLULOSE FOR CHEMICAL RECYCLING Russian patent published in 2014 - IPC C13K13/00 

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining xylose product and cellulose for chemical recycling from xylane-containing biomass, which has xylane content 10-35%, calculated per dry biomass substance. In accordance with claimed method prehydrolysis of xylane-containing biomass is carried out with obtaining dissolved hemicelluloses hydrolysate and non-dissolved prehydrolysis biomass, and separation of dissolved hemicellulose hydrolysate from non-dissolved prehydrolysis biomass. After that, carried out are: chromatographic fractioning of dissolved hemicellulose hydrolysate, nanofiltration or crystallisation of sediment for obtaining xylose product, which has xylose content, at least, 55% calculated per content of dry substance of xylose product. After that, boiling of non-dissolved prehydrolysis biomass is carried out by sulphate method to obtain cellulose for chemical recycling with permanganate number lower than 14 and viscosity higher than 600 ml/g.

EFFECT: method ensures obtaining high quality cellulose and xylane.

47 cl, 21 tbl, 12 ex