METHOD FOR PREPARING ALCOHOLS AND/OR SOLVENTS OF LIGNOCELLULOSIC BIOMASS WITH ACID RECIRCULATION OF SOLID RESIDUES Russian patent published in 2015 - IPC C12P7/10 C12P7/16 C12P7/28 C12P19/02 

FIELD: chemistry.

SUBSTANCE: invention refers to biochemistry. What is prepared is a method for preparing alcohols and/or acetone of a cellulosic or lignocellulosic substrate. The method involves the stage of alkaline pre-treatment of the substrate involving the stage of heating in the presence of an alkali chemical to produce the pre-treated substrate. The stage of pH reduction to 4.5 to 5.5 and the enzymatic hydrolysis of the pre-treated substrate for preparing the hydrolysate, which contains a liquid phase containing sugars and a solid residue. The stage of alcohol fermentation, the stage of separation/purification for preparing one or more cleaned alcohols and/or solvents. The stage of the solid residue extraction, the stage of acid process for producing one fraction of the extracted solid residue.

EFFECT: presented invention provides improving the yield of the substances and valorisation of the solid residues.

14 cl, 2 dwg, 5 ex