Method of deinking wastepaper

Details Method of deinking wastepaper Method of deinking wastepaper

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) C09D 9/04 (2006.01)

Patent

CA 2175321

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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