Deinking printed wastepaper using alkaline solution containing sodium sulfite and sodium carbonate
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United States of America Patent
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Mar 16, 1999
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N/A
app pub date -
May 5, 1995
filing date -
May 5, 1995
priority date (Note) -
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Abstract
This invention is a method for deinking wastepaper by disintegrating the waste paper in an carbonate aqueous solution containing sodium sulfite and sodium carbonate to produce a fibrous slurry having a pH of at least 7.5, separating the ink from the fibers and removing the ink from the slurry. A composition useful for deinking fiber consists of a relative proportion of sodium sulfite to sodium carbonate between about 95:5 and about 50:50, and a surfactant.
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Cited Art Landscape
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