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US 2021/0207185 A1Published application
Method for cooling and detoxifying biomass
AssigneeValmet Corporation
InventorsPeter Björklund, Andreas Averheim
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 reactor and introduced into a blow tank, wherein the absolute pressure in the blow tank is maintained below atmospheric pressure. The slurry of biomass separated in the blow tank is then enzymatically treated.
Claims17
A method for treating biomass comprising the steps of
- (a) feeding lignocellulosic biomass to a pressurized reactor;
- (b) supplying steam to the pressurized reactor and at least partially condensing said steam in the pressurized reactor;
- (c) hydrolysing hemicellulose sugars of said biomass with said at least partially condensed steam in the pressurized reactor;
- (d) discharging said hydrolyzed biomass from the pressurized reactor into a blow tank by steam explosion to produce steam exploded biomass;
- (e) diluting the steam exploded biomass in the blow tank with an aqueous diluent to a pumpable slurry;
- discharging the pumpable slurry from the blow tank as discharged pumpable slurry stream;
- (f) treating the discharged pumpable slurry stream with an enzyme, characterized by
- withdrawing a vaporous aqueous stream from the blow tank for maintaining the absolute pressure in said blow tank below atmospheric pressure.
5 more elements
A device for treating biomass comprising
- a biomass feeding system;
- a pressurized reactor for thermally treating the biomass;
- a blow tank;
- a discharging system for discharging the hydrolyzed biomass from the pressurized reactor to the blow tank by steam explosion;
- and
- a unit for enzymatically treating a pumpable slurry stream of biomass discharged from the blow tank;
- wherein
- the blow tank comprises
- means for maintaining the absolute pressure in the blow tank below atmospheric pressure;
- at least one injection port for injecting an aqueous diluent;
- at least one discharge port for discharging said pumpable slurry stream of biomass;
- at least one discharge port for discharging a vaporous aqueous stream.
9 more elements
Dependencies are inferred from the claim text.