Reduction of salt scale precipitation by control of process stream Ph and salt concentration
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United States of America Patent
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Sep 10, 1996
Grant Date -
N/A
app pub date -
Oct 1, 1993
filing date -
Oct 1, 1993
priority date (Note) -
Expired
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Abstract
A method for reducing or eliminating the formation of salt scale upon process equipment caused by precipitation of salts during the bleaching of pulp. The pulp is subjected to a bleaching sequence which includes a plurality of pulp treatment steps, wherein at least one pulp treatment step is conducted under alkaline conditions and at least one pulp treatment step is conducted under acidic conditions. A filtrate stream which contains dissolved salts therein is thus generated, and at least a portion of the filtrate stream is combined with an alkaline stream and pulp to cause the salts to associate with the pulp, thus removing the salts from the filtrate stream to reduce or eliminate the formation of salt scale upon process equipment during the bleaching of the pulp.
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