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Method of obtaining inorganic salt and acetate salt from cellulosic biomass

  • US 8,247,200 B2
  • Filed: 01/24/2008
  • Issued: 08/21/2012
  • Est. Priority Date: 01/25/2007
  • Status: Expired due to Fees
First Claim
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1. A process, comprising:

  • a) pretreating the cellulosic biomass by adding a base to the cellulosic biomass to produce a pretreated cellulosic biomass comprising the acetate salt;

    b) adding an acid to the pretreated cellulosic biomass to adjust the pretreated cellulosic biomass to a pH of 4.0 to 6.0, thereby producing a neutralized cellulosic biomass;

    c) hydrolyzing the neutralized cellulosic biomass with cellulase enzymes to produce a crude sugar stream;

    d) separating insoluble residue from the crude sugar stream to produce a clarified sugar stream; and

    e) feeding an aqueous stream obtained from the pretreated cellulosic biomass, an aqueous stream obtained from the neutralized cellulosic biomass, the clarified sugar stream, or a combination thereof, to an ion exclusion chromatographic separation to produce the salt stream comprising inorganic salt and acetate salt, which ion exclusion separation is performed at a pH range between 5.0 and 10.0 using a cation exchange resin.

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