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Apparatus for pulping sawdust

  • US 6,379,504 B1
  • Filed: 10/19/2001
  • Issued: 04/30/2002
  • Est. Priority Date: 08/31/1995
  • Status: Expired due to Fees
First Claim
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1. A system for producing chemical pulp from sawdust, comprising:

  • a static down-flow superatmospheric pressure retention vessel having a top for receipt of a sawdust slurry, and a bottom which includes non-mechanical discharge means for discharging chemical pulp;

    a first mixer means for mixing steam and cooking liquor with sawdust to form an initial slurry, subsequent means for diluting, raising the temperature to cooking temperature, and pressurizing the initial slurry to provide a slurry suitable for cooking, and elevating the slurry to the top of said retention vessel to feed slurry Into the top of the retention vessel; and

    a superatmospheric pressure vessel connected to said non-mechanical discharge means and including means for displacing cooking liquid from the pulp after the pulp is discharged from the bottom of said retention vessel to lower the temperature thereof below cooking temperature.

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