Removal of sodium chloride from pulp mill systems

Details Removal of sodium chloride from pulp mill systems Removal of sodium chloride from pulp mill systems

1974-08-05

1976-05-04

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 19, 162 30K, 162 89, 162DIG8, 23303, 423207, 423499, D21C 302, D21C 1104

Patent

active

039545520

ABSTRACT:
Smelts produced in spent pulping liquor recovery operations and containing sodium chloride are treated to remove sodium chloride therefrom in pure form while the loss of usable components is avoided. A solid mixture of sodium chloride, sodium carbonate and sodium sulphate is provided as such in a soda mill, or first is separated from sodium sulphide, by fractionating the smelt where sodium sulphide is present, as in the Kraft mill. The solid mixture is leached at a high temperature to remove all the sodium chloride values therefrom, along with part of the sodium carbonate and sodium sulphate. Pure sodium chloride is deposited by cooling the leach liquor and the mother liquor is recycled to the leaching step.

REFERENCES:
patent: 1791281 (1931-02-01), Morse
patent: 2642399 (1953-06-01), Aries et al.
patent: 2862887 (1958-12-01), Boyer
patent: 3560329 (1971-02-01), Nelson et al.
patent: 3698995 (1972-10-01), Raysson
patent: 3746612 (1973-07-01), Raysson et al.
patent: 3755068 (1973-08-01), Raysson
patent: 3909344 (1975-09-01), Lukes

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