Alkaline surfactant system for de-inking printed fibrous...

Details Alkaline surfactant system for de-inking printed fibrous... Alkaline surfactant system for de-inking printed fibrous...

D - Textiles, Paper

21

C

9/1

D21C 5/02 (2006.01)

Patent

CA 1124459

ABSTRACT OF THE DISCLOSURE A de-inking process for removing ink and other substances from printed paper which process is capable of providing de-inked paper stock hav- ing 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 surfac- tant 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.

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