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US 12,522,574 B2Granted
Process for the production of furfural
AssigneeArbaflame Technology AS
InventorRune Brusletto
Life of this patent
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Abstract
The present invention refers to a method of producing furfural and optionally further basic chemicals from biomass material comprising treatment of the biomass material at elevated pressures and temperatures, to the condensates and solid product obtained by the method of the invention, as well as to their use.
Claims20
A method of producing furfural, comprising the steps of:
- (i) providing (a) biomass material and (b) oxygen or oxygen donors at a concentration of 0.01-0.50 mol O2 or O2 equivalents per kg of dried biomass material in a reaction vessel,
- (ii) adjusting the pressure in the reaction vessel to an elevated pressure p1 and the temperature in the reaction vessel to an elevated temperature T1, wherein the pressure p1 is >1 bar and, the temperature T1 ranges from 150° C. to 280° C.,
- (iii) endogenously maintaining the pressure p1 and/or the temperature T1 for a predetermined time span t1, wherein the predetermined time span t1 is 500-700 s,
- (iv) adjusting the pressure in the reaction vessel to an elevated pressure p2 and/or the temperature in the reaction vessel to an elevated temperature T2, wherein adjusting the pressure in the reaction vessel to the elevated pressure p2 is performed with a rate of 1-15 bar/min, the pressure p2 is in the range of from >1 to 50 bar, and the temperature T2 ranges from 100° C. to 250° C.,
- (v) optionally maintaining the pressure p2 and/or the temperature T2 for a predetermined time span t2, wherein the pressure p1 is higher than the pressure p2,
- (vi) opening the reaction vessel, wherein opening of the reaction vessel in step (vi) is controlled to depressurize the reaction vessel with a rate of 40-100 bar/min, and
- (vii) optionally separating solid products from the reaction mixture present in the reaction vessel,
- wherein the furfural is produced in the presence of the oxygen or oxygen donors,
- and
- wherein a furfural containing vapor stream is withdrawn during steps (iii), (iv), (v) and/or (vi) and collected in the form of condensates.
7 more elements
A method of producing furfural, comprising the steps of:
- (i) providing (a) biomass material and (b) oxygen or oxygen donors at a concentration of 0.01-0.50 mol O2 or O2 equivalents per kg of dried biomass material in a reaction vessel,
- (ii) adjusting the pressure in the reaction vessel to an elevated pressure p1 and the temperature in the reaction vessel to an elevated temperature T1, wherein the pressure p1 is >1 bar, and the temperature T1 ranges from 150° C. to 280° C.,
- (iii) maintaining the pressure p1 and/or the temperature T1 for a predetermined time span t1, wherein the predetermined time span t1 is 500-700 s,
- (iv) adjusting the pressure in the reaction vessel to an elevated pressure p2 and/or the temperature in the reaction vessel to an elevated temperature T2, wherein adjusting the pressure in the reaction vessel to p2 is performed with a rate of 1-15 bar/min, the pressure p2 is in the range of from >1 to 50 bar, and the temperature T2 ranges from 100° C. to 250° C.,
- (v) optionally maintaining the pressure p2 and/or the temperature T2 for a predetermined time span t2, wherein the pressure p1 is higher than the pressure p2,
- (vi) opening the reaction vessel, wherein opening of the reaction vessel in step (vi) is controlled to depressurize the reaction vessel with a rate of 40-100 bar/min, and
- (vii) optionally separating solid products from the reaction mixture present in the reaction vessel,
- wherein the furfural is produced in the presence of the oxygen or oxygen donors, and
- wherein a furfural containing vapor stream is withdrawn during steps (iii), (iv), (v) and/or (vi) and collected in the form of condensates.
6 more elements
Dependencies are inferred from the claim text.