Wastepaper deinking process

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 6, 162 7, 162 8, D21C 502

Patent

active

046184007

ABSTRACT:
A method for the deinking of wastepaper which comprises converting the wastepaper to a pulp, contacting the pulp with an aqueous medium of alkaline pH containing between about 0.2 and 2 percent by weight, calculated on dry weight of the pulp, of a deinking agent which is one or a mixture of certain thiol ethoxylate compounds, and treating the resulting pulp-containing medium to remove suspended or dispersed ink. The use of a thiol ethoxylate deinking agent offers a high level of performance in such a deinking process, both from the standpoint of the overall brightness and dirt count of paper prepared from the deinked pulp. In certain specific embodiments, the invention further comprises a step for treating thiol ethoxylate containing process streams and effluents to convert the surface active deinking agent to low-foaming sulfonyl derivatives, or to degrade the deinking agent to non-surface-active matter.

REFERENCES:
patent: 2205021 (1940-06-01), Schuette et al.
patent: 2494610 (1950-01-01), Davidson et al.
patent: 2565986 (1951-08-01), Olin
patent: 2677700 (1954-05-01), Jackson et al.
patent: 3072521 (1963-01-01), Samuelson et al.
patent: 3174900 (1965-03-01), Wyant
patent: 4162186 (1979-07-01), Wood et al.

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