Control of pulp-paper mill pitch deposits

Details Control of pulp-paper mill pitch deposits Control of pulp-paper mill pitch deposits

1975-12-08

1976-11-16

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162168R, 162168N, 162168NA, 162169, 162DIG4, D21C 320

Patent

active

039922499

ABSTRACT:
The deposition of adhesive pitch particles from aqueous suspension of cellulose fibers is inhibited and, if desired, substantially prevented, from depositing on the surfaces of pulp-making equipment by adding to the suspension an anionic polymer containing at least about 25 mol percent but not more than about 85 mol percent of hydrophobic oleophilic linkages selected from the group comprising styrene, isobutylene, methylstyrene, allyl stearate, octadecyl acrylate, octadecene, dodecene, n-octadecylacrylamide, vinyl stearate and vinyl dodecyl ether and at least about 15 mol percent but not more than about 75 mol percent of hydrophilic acid linkages selected from the group comprising acrylic acid, methacrylic acid, maleic acid, itaconic acid, acrylamidoacetic acid, maleamic acid and styrenesulfonic acid, forming a pitch-polymer complex of said particles and said polymer, and removing said complex with the water used to wash said cellulose fiber suspension thereby separating substantially all of the pitch-polymer complex from said cellulose fiber suspension, wherein the amount of polymer thus added prior to beating being in the range of about 0.5-100 parts by weight of polymer per million parts per weight of the suspension.

REFERENCES:
patent: 2723195 (1955-11-01), Blake
patent: 3334072 (1967-08-01), Sellet
patent: 3393168 (1968-07-01), Johnson
patent: 3840489 (1974-10-01), Strazdins

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