Process for controlling the degree of causticization in the prep

Details Process for controlling the degree of causticization in the prep Process for controlling the degree of causticization in the prep

1979-06-27

1980-12-02

Kratz, Peter F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

23230A, 162 49, 423183, 423DIG3, D21C 1104

Patent

active

042369606

ABSTRACT:
Process is provided for controlling the degree of causticization of white liquor in its preparation from green liquor by the addition of calcium oxide, which comprises determining the sodium carbonate concentration of green liquor fed to the causticization; determining the sodium carbonate concentration of white liquor resulting from the causticization; and controlling the degree of causticization within a predetermined range while taking both sodium carbonate concentrations into account, so as to maintain the degree of causticization of the white liquor within the range despite variations in sodium carbonate concentration of the green liquor and variations in calcium oxide content of the calcium oxide added for causticization.

REFERENCES:
patent: 2161453 (1939-06-01), Bisby et al.
Jacobi et al., "Control of White Liquor Preparation", AB1 PC vol. 47, No. 4, abstract 3423(M), 1976.
Chemical Recovery in Alkaline Pulping Processes, Whitney (Editor), Tajysi Monogaysl Series No. 32., 1968, pp. 121-124
Uronen, "Computer Control in the Recovery of the Kraft Process", Tajysi/Nov. 1978, vol. 61, No. 11, pp. 57-61.

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