METHOD OF PRODUCING COMPOUNDS OF FURAN SERIES FROM NEUTRAL LIGNOSULPHONATES Russian patent published in 2021 - IPC C07D307/08 C07D307/44 C07D307/50 C13K13/00 C08B37/14 C07H1/00 C07H3/02 

FIELD: technological processes.

SUBSTANCE: present invention relates to a method of producing compounds of furan series from a pentosane-containing fraction of neutral lignosulphonate. Method includes the following steps: (a) fractionating the feedstock to treat neutral lignosulphonate with an alkali solution to pH not higher than 9 and recovering the pentosane-containing fraction by gel filtration while washing the pentosans from the gel granules with hot water; (b) hydrolysis of pentosans to pentose (xylose) with heating to at least 200°C; (c) deacidating xylose in the presence of an acid catalyst at room temperature; (d) extracting furfural into an organic layer; (e) separating furfural, furan and tetrahydrofuran by boiling point distillation.

EFFECT: obtaining furanic compound with output of not less than 50% of pentosane-containing fraction of neutral lignosulphonate.

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