Process of producing kraft pulping liquor by the oxidation of wh

Details Process of producing kraft pulping liquor by the oxidation of wh Process of producing kraft pulping liquor by the oxidation of wh

1990-04-05

1992-01-21

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 38, 162 82, D21C 1104, D21C 1112

Patent

active

050825267

ABSTRACT:
Sodium sulfide or hydrosulfide is oxidized to produce sodium polysulfide and sodium hydroxide. Under appropriate conditions, the oxidation may be pursued further to convert all the sodium sulfide into sodium thiosulfate. The oxidation is carried out at or above atmospheric pressure in a mixed reactor or in a pipeline reactor, by sparging oxygen or air, in a mixture of white liquor and lime mud particles produced in the recausticizing plant of a kraft mill.

REFERENCES:
patent: 3216887 (1965-11-01), Landmark
patent: 4053352 (1977-10-01), Hultman et al.
patent: 4507172 (1985-03-01), Steltenkamp
patent: 4770742 (1988-09-01), Bonsu

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