Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
162 7, 162 8, D21C 502
A de-inking process for removing ink and other substances from printed paper which process is capable of providing de-inked paper stock having improved brightness. The process utilizes an aqueous de-inking solution containing a mixture of certain surfactants, at least one surfactant being a water-soluble nonionic surfactant and the other surfactant being an oil-soluble nonionic surfactant. De-inking is carried out at a temperature in the range of about room temperature to about the boiling temperature of the solution by forming a slurry of the printed paper in the solution having a predetermined fibrous material solids content. The total nonionic surfactant concentration in the de-inking solution can be about 0.1 to about 5 weight percent, preferably about 0.5 to about 2.5 weight percent, based on the amount of fibrous material solids present. The weight ratio of the water-soluble surfactant to the oil-soluble surfactant in the mixture is in a range of about 6:1 to about 3:1, preferably about 4:1.
patent: 3808089 (1974-04-01), Von Koeppen et al.
patent: 3822178 (1974-07-01), Von Koeppen et al.
patent: 3932206 (1976-01-01), Illingworth et al.
McLaughlin Robert L.
Wood Donald C.
Bashore S. Leon
Smith William F.
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