Deinking printed wastepaper using alkaline solution containing s

Details Deinking printed wastepaper using alkaline solution containing s Deinking printed wastepaper using alkaline solution containing s

1995-05-05

1999-03-16

Silverman, Stanley S.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 2, D21C 502

Patent

active

058824766

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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