Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1986-01-10
1986-10-21
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
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.
Fried Herbert E.
Wood Donald L.
Bashore S. Leon
Hastings K. M.
Shell Oil Company
LandOfFree
Wastepaper deinking process does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wastepaper deinking process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wastepaper deinking process will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1288427