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Processing biomass

  • US 9,586,341 B2
  • Filed: 03/01/2016
  • Issued: 03/07/2017
  • Est. Priority Date: 11/17/2008
  • Status: Active Grant
First Claim
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1. A method of producing sugars using a screw extrusion process, the method comprising:

  • hydrolyzing one or more lignocellulosic materials with cellulase while conveying the one or more lignocellulosic materials through a screw extrusion process, the one or more lignocellulosic materials having been exposed to ionizing radiation; and

    discharging an extrudate from the screw extrusion process, the extrudate comprising one or more fermentable sugars released from cellulolytic hydrolysis of the one or more lignocellulosic materials;

    wherein the screw extrusion process utilizes a co-extruder having a first barrel and a second barrel; and

    conveying comprises conveying a first lignocellulosic material through the first barrel and conveying a second lignocellulosic material through the second barrel; and

    hydrolyzing comprises exposing the first lignocellulosic material to a first hydrolysis process and exposing the second lignocellulosic material to a second hydrolysis process.

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