Method for hydrogen peroxide bleaching of pulp using an organic solvent in the bleaching medium
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United States of America Patent
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Aug 2, 2005
Grant Date -
Aug 26, 2004
app pub date -
Feb 21, 2003
filing date -
Feb 21, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method for pulp bleaching. The method comprises the steps of providing a pulp sample for bleaching, the pulp sample stemming from a pulp producing process, providing a bleaching liquor comprising water and an organic component as solvent components constituting a bleaching medium, dissolved within are at least a bleaching agent, and a basic agent; and subjecting the pulp sample to the bleaching liquor for a predefined amount of time at predefined bleaching conditions. A preferred bleaching agent is hydrogen peroxide. The organic component amounts to at least 5% in weight of the bleaching medium.
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