METHOD OF PRODUCING FURFURAL Russian patent published in 2024 - IPC C07D307/50 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing furfural. This method includes the following steps: (i) feeding biomass material into a reaction vessel; (ii) bringing pressure in reaction vessel to high pressure p₁ and temperature in reaction vessel to high temperature T₁; (iii) maintaining pressure p₁ and temperature T₁ for a predetermined period of time t₁; (iv) bringing pressure in reaction vessel to high pressure p₂ and temperature in reaction vessel to high temperature T₂; (v) optionally maintaining pressure p₂ and temperature T₂ for a predetermined period of time t₂; (vi) opening the reaction vessel; and (vii) separating the solid products from the reaction mixture present in the reaction vessel. At that, the pressure p₁ is higher than pressure p₂, the furfural-containing steam stream is removed in steps (iii), (iv), (v) and / or (vi) and collected in the form of condensates, and the method is carried out in the presence of oxygen or oxygen donors at concentration of 0.01–0.50 mol O₂ or equivalent of O₂ per kg of dried biomass material.

EFFECT: providing an improved method of producing furfural, which provides a significant increase in the output of the product in a shorter time.

26 cl, 1 dwg, 1 tbl, 4 ex