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Method for recycling sulfur dioxide from sulfite pulping liquors

  • US 5,096,540 A
  • Filed: 04/06/1990
  • Issued: 03/17/1992
  • Est. Priority Date: 04/06/1990
  • Status: Expired due to Fees
First Claim
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1. In a method for recycling sulfur dioxide from spent chemical and semi-chemical sulfite pulping liquor, the steps consisting of:

  • a. acidifying the spent liquor;

    b. then evaporating the acidified spent liquor to expel sulfur dioxide and water vapor and;

    c. collecting the expelled sulfur dioxide and water vapor for recycling as pulping liquor.

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