Process for treatment of biomass feedstocks
First Claim
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1. A method for continuously treating biomass material, comprising:
- contacting the biomass material and a liquid swelling agent in a first vessel under a pressure sufficient to prevent vaporization of the liquid swelling agent and for a time sufficient to allow the liquid swelling agent to swell fibers within the biomass material; and
transferring the biomass material to a second vessel having a pressure sufficiently less than that of the first vessel such that at least a portion of the liquid swelling agent rapidly vaporizes, causing the biomass fibers to rupture;
wherein the first vessel is pressurized by directing a vapor stream including vaporized swelling agent into the first vessel at a pressure sufficient to prevent vaporization of the liquid swelling agent in the first vessel.
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Abstract
A method and apparatus for continuously treating a moist biomass feedstock is disclosed. The method includes treating a biomass feedstock with a swelling agent in a pressurized first vessel, transferring the feedstock to a second vessel at a lower operating pressure than the first vessel such that the biomass fibers rupture. At least portions the swelling agent, and/or the moisture are recycled in the process.
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Citations
5 Claims
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1. A method for continuously treating biomass material, comprising:
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contacting the biomass material and a liquid swelling agent in a first vessel under a pressure sufficient to prevent vaporization of the liquid swelling agent and for a time sufficient to allow the liquid swelling agent to swell fibers within the biomass material; and transferring the biomass material to a second vessel having a pressure sufficiently less than that of the first vessel such that at least a portion of the liquid swelling agent rapidly vaporizes, causing the biomass fibers to rupture; wherein the first vessel is pressurized by directing a vapor stream including vaporized swelling agent into the first vessel at a pressure sufficient to prevent vaporization of the liquid swelling agent in the first vessel. - View Dependent Claims (5)
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2. A method for continuously treating biomass material, comprising:
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treating the biomass material with a liquid swelling agent in a first vessel under a pressure sufficient to prevent vaporization of the liquid swelling agent and for a time sufficient to allow the liquid swelling agent to swell fibers within the biomass material; and transferring the treated biomass material to a second vessel having a pressure sufficiently less than that of the first vessel such that at least a portion of the liquid swelling agent rapidly vaporizes, causing the biomass fibers to rupture, wherein the first vessel is pressurized by directing a vapor stream including vaporized swelling agent into the first vessel at a pressure sufficient to prevent vaporization of the liquid swelling agent in the first vessel; drying the ruptured biomass material to provide a second vapor stream and a dry biomass; condensing the second vapor stream; and using the condensed second vapor stream to treat the biomass material before the biomass material enters the first vessel. - View Dependent Claims (3, 4)
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Specification