Process for producing dithionites

Details Process for producing dithionites Process for producing dithionites

1981-03-05

1987-09-15

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C01B 1766

Patent

active

046938800

ABSTRACT:
A process for producing an anhydrous dithionite which comprises reacting formic acid or a formate, an alkaline compound and sulfur dioxide in the presence of water and an organic solvent, filtering the resulting dithionite crystal from the mother liquor, washing the dithionite crystal with an organic solvent and drying the dithionite crystal, characterized in that in the washing step, the washings first discharged are distilled by a convention method for recovery of the organic solvent, the washings discharged subsequently being used as the reaction solvent without distillation.

REFERENCES:
patent: 2226576 (1940-12-01), Park et al.
patent: 2938771 (1953-04-01), Avedikian
patent: 3917807 (1975-11-01), Yasue et al.
patent: 3927190 (1975-12-01), Yoshikawa et al.
patent: 4042674 (1977-08-01), Yamamoto et al.
patent: 4388291 (1983-06-01), Arakawa
Skoog et al, Fundamentals of Analytical Chemistry, Holt Rinehart and Winston, NY, NY, 1963, pp. 116-118.
Perry et al, Chemical Engineers Handbook, McGraw Hill Book Co, NY, NY, 1973, pp. 19-80-19-81.

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