Abstract:
A system has been developed for pretreating cellulosic biomass feed stock including: a first pressurized reactor receiving the feed stock, wherein the feed stock undergoes hydrolysis in the first pressurized reactor; a sealing device having a first pressurized coupling to a feedstock discharge port of the first pressurized reactor, and a second pressurized coupling to a second pressurized reactor; a drain for a liquid including dissolved hemi-cellulosic material extracted from the feed stock in at least one of the first pressurized reactor and the sealing and extraction device; the second pressurized reactor assembly receiving the pressurized feed stock from the sealing device at a pressure substantially greater than the pressure in the first pressurized reactor, wherein cells of the feed stock are infused with water in the second pressurized reactor, and an expansion device downstream of the second pressurized reactor assembly, wherein the expansion device rapidly releases the pressure of the feed stock discharged from the second pressurized reactor such that the feed stock undergoes a steam explosion reaction.
Abstract:
A method for chemically digesting cellulosic fibrous material including: adding a liquor to cellulosic fibrous material to form a slurry in a chip feed system; transporting the slurry from the chip feed system to a batch digester vessel; determining when a chip level rises above an extraction screen in the batch digester vessel; after the chip level rises above the extraction screen, extracting liquor from the batch digester vessel while the transport continues of the slurry into the batch digester vessel; adding cooking liquor to slurry in the batch digester vessel; ceasing the transport of the slurry into the batch digester vessel and thereafter converting the cellulosic material in the vessel to a pulp, and discharging the pulp from the batch digester vessel before restarting the transporting of the slurry into the digester vessel.
Abstract:
A method for treating cellulosic biomass feed stock including: feeding the feed stock to an upper inlet of a vertical reactor vessel, wherein the feed stock is deposited on a pile of feed stock within the vertical reactor vessel; adding heat energy to heat the feed stock by injecting steam to an upper region of the vertical reactor vessel; propelling the feed stock through an outlet in a lower region of the vertical reactor vessel by injecting steam into the biomass at, near or after the bottom outlet of the vertical reactor vessel, and moving the propelled feed stock through an expansion device, such as a steam explosion device, to subject the feed stock to a steam explosion process.
Abstract:
A method for torrefaction of biomass using a torrefaction reactor vessel having stacked trays including: feeding the biomass to an upper inlet of the vessel such that the biomass material is deposited on an upper tray of a vertical stack of trays in the reactor; cascading the biomass down through the trays by passing the biomass through an opening in each of the trays to deposit the biomass on a lower tray; as the biomass moves around each of the stacked trays, heating the biomass material with an oxygen deprived gas; extracting moisture containing gas having passed through the biomass on the upper trays wherein the extraction is immediately below each of the upper trays; as the biomass undergoes torrefaction in the lower trays of the stacked trays, retaining the gas with the biomass until the biomass falls from the stacked trays to a pile of biomass in the reactor vessel; exhausting gases containing organic compounds volatized by the torrefaction of the biomass through a gas outlet on the vessel at an elevation between the stacked trays and the pile of biomass, and discharging torrefied biomass from a lower outlet of the torrefaction reactor vessel.
Abstract:
A method to treat a lignocellulosic material including: performing a steam explosion reaction on the lignocellulosic material and discharging a slurry from the reaction that compresses the lignocellulosic material; adding an alkali material to the slurry in a first conveyor, wherein the alkali material increases the average pH of the slurry moving through the first conveyor; transferring the slurry with the alkali material from the first conveyor to a second conveyor; adding an enzyme solution to the slurry while in, entering or at the discharge of the second conveyor; transferring the slurry with the enzyme solution from the second conveyor slurry to a mixer; mixing the slurry in the mixer, wherein a second portion of the enzyme solution is added to the slurry during the mixing, and transferring the slurry with the enzyme solution from the mixer to a first reactor vessel wherein the slurry in the first reactor vessel undergoing enzymatic hydrolysis such that the viscosity of the slurry is reduced in the first reactor vessel.
Abstract:
A gasifier feed system includes a buffer assembly that receives material, such as comminuted cellulosic material to be fed to a gasifier and includes structure that pre-processes the material for delivery to the gasifier. A source of pressurized inert gas is coupled with the buffer assembly. A rotary valve is positioned relative to the buffer assembly to receive the material from the buffer assembly. The rotary valve conveys the material to the gasifier and includes a gas lock that prevents gas from escaping the gasifier.
Abstract:
A method to treat biomass, e.g., lignocellulosic material, including: performing a pretreatment step on the biomass and discharging the pretreated biomass; in at least a first enzymatic hydrolysis reactor producing a liquefaction material, recirculating at least a portion of the liquefaction material from the at least first reactor to a location upstream of the addition of the enzymes as at least a portion of the coolant for the hot pretreated biomass.
Abstract:
A method to treat biomass, e.g., lignocellulosic material, including: performing a pretreatment step on the biomass and discharging the pretreated biomass; in at least a first enzymatic hydrolysis reactor producing a liquefaction material, recirculating at least a portion of the liquefaction material from the at least first reactor to a location upstream of the addition of the enzymes as at least a portion of the coolant for the hot pretreated biomass.
Abstract:
This disclosure relates to a method for performing high solids saccharification comprising by (a) providing a cellulosic biomass; (b) pretreating the cellulosic biomass in a pretreatment process to produce a pretreated cellulosic biomass; (c) adjusting said pretreated cellulosic biomass to a solids concentration of 6% to 35% w/w and a starting pH of between 5-7; and (d) hydrolyzing the pretreated biomass with at least one aqueous hydrolyzing liquid comprising at least one enzyme selected from the group consisting of a cellulase, a saccharification enzyme, and a combination thereof for a period of time, to hydrolyze at least a part of the pretreated cellulosic biomass to a cellulosic hydrolysate, said cellulosic hydrolysate comprising fermentable sugars.
Abstract:
A feed system for a comminuted cellulosic material including: a chip bin having an upper chip inlet, an interior chamber oriented generally vertically and a lower discharge port; at least one liquor inlet to the chip bin to inject liquor in the chip bin, wherein the chip bin retains sufficient liquor and chips within the interior chamber to create a hydraulic pressure on the chips at the lower discharge port; a generally horizontally oriented chip conveyor or tube coupled to the lower discharge port to receive the chips and liquor from the bin under the hydraulic pressure, wherein the conveyor or tube includes liquor injectors which inject liquor into the chips and the conveyor or tube, and a high pressure transfer device coupled to a discharge of the conveyor or tube to receive the chips and liquor, whereby the hydraulic pressure of the chips and liquor at the discharge of the chip bin is sufficient to feed the chips and liquor to the high pressure transfer device.