Multi-stage bleaching process having a final stabilized peroxide stage
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United States of America Patent
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Apr 24, 2001
Grant Date -
N/A
app pub date -
Jun 29, 1993
filing date -
Jul 6, 1992
priority date (Note) -
Expired
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Abstract
Process for bleaching a chemical paper pulp to a brightness of at least 89.degree. ISO, consisting in subjecting the pulp to a treatment sequence of several stages including a final bleaching stage with hydrogen peroxide in alkaline medium carried out in the presence of at least one stabilising agent and at a consistency of at least 25% by weight of solids, the stages preceding this final stage having purified the pulp so that its manganese content does not exceed 3 ppm by weight with respect to the solids and that the pulp has been delignified beforehand to a kappa number not exceeding 5.
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