Process for de-inking recycled paper pulp with a reducing agent
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United States of America Patent
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Jul 4, 1995
Grant Date -
N/A
app pub date -
Jun 28, 1993
filing date -
Jul 2, 1992
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Expired
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Abstract
Recycled paper pulp is de-inked by pulping it at neutral or alkaline pH with an aqueous deinking composition comprising one or more reducing agents. The preferred reducing agents are sodium bisulfite and sodium borohydride. Sodium hydroxide is preferably used to give the desired pH.
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