Treatment of cellulosic material and compositions for use in thi

Details Treatment of cellulosic material and compositions for use in thi Treatment of cellulosic material and compositions for use in thi

1994-10-17

1997-06-10

Redding, David A.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 8, 162 72, 162 76, 162 78, D21C 502

Patent

active

056371918

ABSTRACT:
A process of de-inking waste paper can be operated under conditions using a simple combination of chemicals to result in a waste liquor that is substantially environmentally friendly. The process comprises forming a pulp from the waste paper in a aqueous medium that has a pH of between 6 and 9 and that is substantially free of dissolved phosphate and that includes an ink-dispersing amount of polycarboxylic acid dispersing agent, and separating the ink from the pulp. The use of a cationic surfactant for promoting flotation is particularly desirable.

REFERENCES:
patent: 1925372 (1933-09-01), Darling
patent: 2525594 (1950-10-01), Fennell
patent: 4162186 (1979-07-01), Wood et al.
patent: 4347099 (1982-08-01), De Ceuster et al.
patent: 4360439 (1982-11-01), Calmanti et al.
patent: 4780179 (1988-10-01), Clement

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