METHOD FOR PREPARING LEVULINIC ACID FROM LIGNOCELLULOSIC BIOMASS Russian patent published in 2017 - IPC C07C51/00 C07C59/185 

FIELD: chemistry.

SUBSTANCE: method for the preparing levulinic acid from lignocellulosic biomass containing hemicellulose comprising one or more precursors of compounds representing six-membered hydrocarbon compounds includes the steps of: hydrolyzing lignocellulosic biomass in a hydrolysis reactor at a temperature of about 170°C to about 185°C for about 35 minutes to about 60 minutes to obtain the first phase comprising a partially hydrolysed lignocellulosic biomass comprising cellulose and lignin and the second phase containing one or more sugars containing five-membered hydrocarbon chains and one or more sugars containing six-membered hydrocarbon chains, as a result of the degradation of hemicellulose, separating the first phase from the second phase, converting, at least, a part of one or more sugars containing five-membered hydrocarbon chain, in furfural, intermediate reacting furfural, tar or a combination thereof in the presence of one or more sugars that contain a six-membered hydrocarbon chain, separating, at least, a part of furfural, intermediate reacting furfural, tar or combination thereof from one or more sugars that contain a six-membered hydrocarbon chain, and then transforming, at least, parts of one or more sugars that contain a six-membered hydrocarbon chain, in levulinate acid. The method version is also claimed.

EFFECT: expanding versions of the method for preparing levulinic acid and related products.

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