Method for controlling the sodium carbonate concentration of gre

Details Method for controlling the sodium carbonate concentration of gre Method for controlling the sodium carbonate concentration of gre

1991-07-22

1993-05-25

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

162 3011, 162 43, 162 44, 162 45, D21C 714

Patent

active

052136639

ABSTRACT:
A method for regulating the sodium carbonate concentration of a green liquor in the dissolving tank of the Kraft recovery process by measuring the conductivity of the green liquor from the dissolving tank, measuring the conductivity and flow rate of a weak wash solution being added to the green liquor in the dissolving tank, using these measurements to determine the sodium carbonate concentration of the green liquor in the dissolving tank, and adjusting the volume of the weak wash solution being added to the dissolving tank in response to changes in the concentration of sodium carbonate in the green liquor so as to maintain the concentration of sodium carbonate in the green liquor at a predetermined, preferably constant, level.

REFERENCES:
patent: 4236960 (1980-12-01), Hultman et al.
patent: 4311666 (1982-01-01), Hultman et al.
Theliander, "A System Analysis of the Chemical Recovery Plant of the Sulfate Pulping Process" (1989) Nordic Pulp/Paper Research Journal No. 4, pp. 263-271.
Dorris, et al., "Conductivity Sensors for Slaker Control: Part 1--Laboratory Results" (Jul. 1989) Journal of Pulp/Paper Science 15:4, pp. 122-131.
Musow et al., "Recausticizing Control Utilizing Torodial Magnetic Sensor Technology and Controller With Artificial Intelligence" (1985) Engineering Conference Book 1, Tappi Press, pp. 199-209.

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