Process for removal of potassium values from pulp mill liquors

Details Process for removal of potassium values from pulp mill liquors Process for removal of potassium values from pulp mill liquors

1979-04-02

1981-02-10

Kratz, Peter F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

23302R, 162 30R, 162 30K, 162 33, 423DIG3, D21C 1104

Patent

active

042499909

ABSTRACT:
The accumulation of potassium values in a closed cycle pulp mill process usually using sodium hydroxide as a pulping chemical is prevented by removal of potassium values as potassium chloride by crystallization. A variety of procedures are described, including coprecipitation from white liquor with sodium chloride followed by separation of the codeposited salts, precipitation from white liquor separate from sodium chloride precipitation, and intermittent precipitation from green liquor with intermittent precipitation of sodium chloride from white liquor.

REFERENCES:
patent: 3365278 (1968-01-01), Kelly et al.
patent: 3909344 (1975-09-01), Lukes
patent: 3950217 (1976-04-01), Reeve
The Effluent-Free Bleached Kraft Pulp Mill, Rapson et al., Tappi, vol. 56, No. 9, 1973, pp. 112-115.

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