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Method and system for efficient production of dissolving pulp in a kraft mill producing paper grade pulp with a continuous type digester

  • US 8,951,388 B2
  • Filed: 04/06/2012
  • Issued: 02/10/2015
  • Est. Priority Date: 04/08/2011
  • Status: Active Grant
First Claim
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1. A method for selectively producing pulp of different grades using a continuous digester, comprising:

  • supplying organic fiber-containing material to a vertical pressure vessel system;

    performing pre-hydrolysis and neutralization in a batch mode on the organic fiber-containing material in the vertical pressure vessel system;

    providing the contents of the vertical pressure vessel system to a continuous digester after pre-hydrolysis and neutralization; and

    performing kraft cooking with the continuous digester to produce a brownstock for dissolving pulp;

    wherein either (1) the vertical pressure vessel system comprises a plurality of vessels for performing pre-hydrolysis and neutralization in a batch mode, and/or (2) the vertical pressure vessel system transfers organic fiber-containing material to a storage tank after pre-hydrolysis and neutralization to facilitate a steady flow thereof to the continuous digester.

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