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Methods and devices for hydrothermal pretreatment of lignocellulosic biomass

  • US 10,513,823 B2
  • Filed: 11/12/2014
  • Issued: 12/24/2019
  • Est. Priority Date: 05/13/2014
  • Status: Active Grant
First Claim
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1. An apparatus for hydrothermal pretreatment of lignocellulosic biomass comprising:

  • a substantially vertical reactor vessel, pressure resistant to between 4 and 23 bar and having an upper part, a lower part, a biomass inlet situated in the upper part, a biomass outlet situated in the lower part, and one or more steam inlets; and

    upper and lower restrictor means situated in the lower part of the substantially vertical reactor vessel and which are moveable between a retracted position in which the upper and lower restrictor means do not occlude passage of biomass through the substantially vertical reactor vessel and an engaged position in which the upper and lower restrictor means occlude the passage of biomass by forming a physical obstruction across a cross section of the substantially vertical reactor vessel;

    wherein said upper restrictor means comprises a series of parallel spears having a generally cylindrical shape and tips which project into a cross section of the substantially vertical reactor vessel.

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