Process for treating the mother liquor by pH adjusting in the pr

Details Process for treating the mother liquor by pH adjusting in the pr Process for treating the mother liquor by pH adjusting in the pr

1975-05-18

1977-08-16

Cooper, Jack

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

260488F, 423184, 423199, 423512A, 423514, 203 74, 423551, C01B 1766

Patent

active

040426750

ABSTRACT:
In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor, which comprises adding an alkali to the mother liquor left after the separation of the resulting anhydrous sodium dithionite to adjust its pH to at least 8, separating the solids precipitated, and oxidizing the filtrate with an oxidizing agent.

REFERENCES:
patent: 3718732 (1973-02-01), Winslow et al.
patent: 3961034 (1976-06-01), Bostian et al.

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