Sodium chloride removal in pulp mill systems

Details Sodium chloride removal in pulp mill systems Sodium chloride removal in pulp mill systems

1974-08-05

1976-03-23

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

23302T, 162 19, 162 30K, 162 89, 162DIG8, 423207, 423499, D21C 302, D21C 1104

Patent

active

039458806

ABSTRACT:
Smelts produced in Kraft mill and soda mill spent pulping liquor recovery operations and containing sodium chloride are treated to remove sodium chloride therefrom in pure form while the removal of usable components is avoided. A solid mixture of sodium chloride, sodium carbonate and sodium sulphate is provided in the case of the soda mill, or first is separated from the sodium sulphide in the case of the Kraft mill. Thereafter, the solid mixture is leached to remove the sodium carbonate and sodium sulphate while leaving the sodium chloride in a substantially pure form, the resulting leach liquor being refrigerated to deposit sodium carbonate and sodium sulphate. The mother liquor, after removal of the deposited salts is recycled to the solid mixture 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), Rapson
patent: 3746612 (1973-07-01), Rapson et al.
patent: 3755068 (1973-08-01), Rapson
patent: 3909344 (1975-09-01), Lukes
patent: 2159935 (1973-06-01), FR France

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