Scale inhibition formulations for kraft digesters

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical

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162 82, 210700, 252180, C02F 514

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active

047999950

ABSTRACT:
Inhibition of calcium scale under the extreme temperature conditions found in pulp digesters has been accomplished by employing certain mixtures of polaminopoly(alkylenephosphonic acids) together with nonionic surfactants. Diethylenetriaminepenta(methylenephosphonic acid) together with a polyethoxynonylphenol has been found especially effective for the purpose.

REFERENCES:
patent: 3434969 (1969-03-01), Ralston
patent: 3784469 (1974-01-01), Krueger et al.
patent: 3992249 (1976-11-01), Farley
patent: 4056430 (1977-11-01), Hoeger et al.
patent: 4092244 (1978-05-01), Suen et al.
patent: 4105573 (1978-08-01), Jacobsen
patent: 4184912 (1980-01-01), Payton
patent: 4240921 (1980-12-01), Kaniecki
patent: 4253912 (1981-03-01), Becker et al.
patent: 4255309 (1981-03-01), Klaessig et al.
patent: 4406811 (1983-09-01), Christensen et al.
Svensk Papperstidning arg. 75, No. 2, 31 Jan. 1972.
Canadian Pulp and Paper Industry, Apr., 1976 pp. 25-27.
Tappi Journa, Apr. 1980, pp. 125-127.
Tappi Journal, May 1982, pp. 179-180.

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