Deinking system for carbonate pulping
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United States of America Patent
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Issued Date -
Jun 23, 2005
app pub date -
Nov 29, 2004
filing date -
Dec 1, 2003
priority date (Note) -
Abandoned
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Abstract
A process for deinking paper being recycled in a carbonate pulping procedure which is performed in the absence of hydroxides and peroxides is improved by the addition of (a) a non-ionic surfactant deinking agent having a cloud point of about 55 to 85, preferably 60-70, and (b) at least two different fatty acid ink collectors: (i) a C16 to C20 fatty acid and (ii) a C22 to C30 fatty acid, the ink collectors being used in a weight ratio of from about 98:2 to 70:30.
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