Process for preparing stable anhydrous sodium dithionite

Details Process for preparing stable anhydrous sodium dithionite Process for preparing stable anhydrous sodium dithionite

1976-12-15

1978-11-21

Cooper, Jack

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

423515, 423265, 423267, C01B 1766

Patent

active

041267168

ABSTRACT:
A process for preparing stable anhydrous sodium dithionite which comprises reacting formic acid or sodium formate, sodium hydroxide, and sulfurous acid anhydride in hydrous methanol, wherein an aqueous solution of sodium carbonate or sodium hydroxide is added to the slurry after the reaction, and stabilized anhydrous sodium dithionite is separated from the slurry.

REFERENCES:
patent: 2913310 (1959-11-01), Sandborn et al.
patent: 3677699 (1972-07-01), Fujiwara et al.
patent: 3804944 (1974-04-01), Kise et al.
patent: 3887695 (1975-06-01), Plentovich et al.
patent: 4017593 (1977-04-01), Voelki et al.

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