Ozone bleaching process using oxalic acid addition
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United States of America Patent
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Oct 1, 2002
Grant Date -
N/A
app pub date -
Mar 8, 2001
filing date -
Sep 9, 1998
priority date (Note) -
Expired
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Abstract
Processes are disclosed for bleaching pulp with ozone in an environmentally friendly bleaching plant. The processes include removing a first filtrate from the pulp, bleaching the treated pulp with ozone, washing the bleached pulp with a washing liquid to provide a washed bleached pulp and a second filtrate including oxalic acid, recycling the second filtrate to the pulp prior to the bleaching step, and transferring the first filtrate to the bleached pulp.
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