Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1973-12-12
1976-04-13
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 30K, 162DIG8, 423207, D21C 326, D21C 1104, D21C 1112
Patent
active
039502171
ABSTRACT:
In the recovery and regeneration of spent pulping chemicals from the production of cellulosic fibrous material pulp there is provided a white liquor containing dissolved quantities of sodium chloride and unregenerated pulping chemicals. The white liquor is concentrated by evaporation to deposit therefrom sodium chloride and unregenerated pulping chemicals, unregenerated pulping chemicals substantially free from sodium chloride are recovered from the deposited materials, and sodium chloride is separated and recovered from the deposited materials. The deposition of sodium chloride and unregenerated pulping chemicals is usually carried out in two stages, with unregenerated pulping chemicals substantially free from sodium chloride being deposited in the first stage. The sodium chloride then is deposited in the second stage, possibly in admixture with unregenerated pulping chemicals, in which event substantially pure sodium chloride is separated from the deposited mixture. At least part of the unregenerated pulping chemicals substantially free from sodium chloride are forwarded to the spend pulping liquor.
REFERENCES:
patent: 3698995 (1972-10-01), Rapson
patent: 3746612 (1973-07-01), Rapson et al.
Bashore S. Leon
Erco Envirotech Ltd.
Kratz Peter F.
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