Process for chlorine dioxide bleaching using a chelating agent without an intermediate wash
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United States of America Patent
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Apr 1, 2003
Grant Date -
N/A
app pub date -
Feb 25, 1997
filing date -
Aug 31, 1994
priority date (Note) -
Expired
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Abstract
Methods for bleaching chemical pulps are disclosed including a final bleaching sequence of bleaching with chlorine dioxide, treating with a chelating agent, in which the bleaching and treating steps are carried out in sequence without an intermediate washing step, washing the bleached pulp, and bleaching with hydrogen peroxide.
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