Maintenance of sulfur concentration in Kraft pulp processes
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United States of America Patent
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Aug 21, 2012
Grant Date -
Mar 24, 2011
app pub date -
Sep 24, 2010
filing date -
Sep 24, 2009
priority date (Note) -
Expired
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Abstract
Methods and apparatus for maintaining sulfur concentration in the chemical recovery cycle of a Kraft pulping process. A portion of the recovery boiler ash is dissolved, treated to remove solids, and combined with an acid to provide a solution. The recovery boiler ash may be dissolved directly in the acid. The acid may be effluent from a chlorine dioxide generator. The resulting solution is maintained in a fully dissolved state and subjected to an acid separation step to provide a sodium sulfate enriched phase, which may be used to maintain sulfur concentration in the Kraft pulping process, and a sulfuric acid phase. Chlorine ions can be separated with the sulfuric acid phase. The sulfuric acid phase can be recycled to the chlorine dioxide generator.
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