Process for bleaching wood pulp with hydrogen peroxide
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United States of America Patent
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Sep 6, 1983
Grant Date -
N/A
app pub date -
Apr 26, 1982
filing date -
Apr 26, 1982
priority date (Note) -
Expired
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Abstract
In the bleaching of wood pulp using the conventional CEH sequence with subsequent oxidation stages, the third stage (H) is replaced by peroxide oxidation (P) to a brightness level of 35-50 GE. Final brightness levels of 70-88 GE are attained using no greater amounts of chemicals in the subsequent stages than are required in the conventional CEHDH process. The temperature in the P stage is between 120.degree. and 170.degree. F.
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