Method of recovering sodium hydroxide from sulfur free pulping o

Details Method of recovering sodium hydroxide from sulfur free pulping o Method of recovering sodium hydroxide from sulfur free pulping o

1974-10-01

1976-12-28

Bashore, S. Leon

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

423207, 162 30R, C01D 104, D21C 1104

Patent

active

040002640

ABSTRACT:
This invention relates to a new and improved recovery method of chemicals from waste liquor of pulping or bleaching. More particularly, this invention relates to a method for direct recovery of sodium hydroxide from waste liquor of pulping or bleaching which is substantially free from sulfur compounds. Ferric oxide is admixed with concentrated waste liquor and thereafter the admixture is burned to form a smelt. By submerging the smelt in hot water a solution of sodium hydroxide and a ferric oxide precipitate are obtained. The precipitated ferric oxide can be reused in the mixing step.

REFERENCES:
patent: 274619 (1883-03-01), Lowig
patent: 1699808 (1929-01-01), Rinman
patent: 1743080 (1930-01-01), Bradley et al.
patent: 1852264 (1929-10-01), Rinman
patent: 1906102 (1933-04-01), Rinman
patent: 3043655 (1962-07-01), Green et al.
patent: 3366535 (1968-01-01), Cann
Casey J. P "Pulp and Paper" vol. I Spc. Ed. Interscience Pub. NY, NY 1960 pp. 267-271.

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