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US 2021/0340487 A1Published application
Method for cooling biomass
AssigneeValmet Corporation
InventorsPatrik Pettersson, Johan Carlsson
Life of this patent
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Abstract
The present invention relates to an improved method and device for treating biomass in which thermally treated biomass is discharged from a pressurized prehydrolysis reactor unit and dewatered before it is cooled with cold liquid. The cooled slurry of biomass is then enzymatically treated.
Claims15
A method for treating biomass comprising:
- (a) feeding biomass to a pressurized prehydrolysis reactor unit;
- (b) thermally treating the biomass in the pressurized prehydrolysis reactor unit;
- (c) discharging the thermally treated biomass from the pressurized prehydrolysis reactor unit to produce a discharged thermally treated aqueous slurry of biomass;
- (d) dewatering the discharged thermally treated aqueous slurry of biomass;
- (e) feeding the dewatered thermally treated aqueous slurry of biomass into a cooling unit;
- (f) cooling the dewatered thermally treated aqueous slurry of biomass by mixing the dewatered thermally treated aqueous slurry of biomass with a liquid having a lower temperature than the dewatered thermally treated aqueous slurry of biomass in the cooling unit;
- and
- (g) treating the cooled aqueous slurry of biomass with an enzyme.
5 more elements
A device for treating biomass comprising:
- a biomass feeding system;
- a pressurized prehydrolysis reactor unit for thermally treating a biomass and for discharging a thermally treated aqueous slurry of biomass;
- a dewatering unit for separating the discharged thermally treated aqueous slurry of biomass into a dewatered thermally treated aqueous slurry of biomass and a filtrate of hot aqueous solution;
- a cooling unit;
- wherein:
- the biomass feeding system is adapted to feed the biomass to the pressurized prehydrolysis reactor unit and to feed the discharged thermally treated aqueous slurry of biomass from the pressurized prehydrolysis reactor unit through the dewatering unit to the cooling unit, and
- the cooling unit comprises:
- at least one feeding port for the dewatered thermally treated slurry of biomass;
- at least one feeding port for a liquid having a lower temperature than the dewatered thermally treated aqueous slurry of biomass;
- means for mixing the dewatered thermally treated slurry of biomass and the liquid;
- and
- at least one feeding port for an enzyme for treating the cooled aqueous slurry of biomass downstream of the at least one feeding port for the dewatered thermally treated slurry of biomass and the at least one feeding port for a liquid having a lower temperature than the dewatered thermally treated aqueous slurry of biomass;
- and
- at least one discharge port for discharging the enzyme treated slurry of biomass from the cooling unit.
11 more elements
Dependencies are inferred from the claim text.