Process for continuously producing anhydrous sodium dithionite

Details Process for continuously producing anhydrous sodium dithionite Process for continuously producing anhydrous sodium dithionite

1976-05-05

1978-03-28

Cooper, Jack

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C01B 1766

Patent

active

040815218

ABSTRACT:
A process for continuously producing anhydrous sodium dithionite in the form of large granules which comprises reacting formic acid, sodium formate, sodium hydroxide and sulfurous acid anhydride in hydrous methanol using a multi-stage reaction apparatus, wherein all the required amounts of the formic acid or sodium formate, sodium hydroxide, methanol and water, and at least 60%, based on the required amount, of sulfurous acid anhydride are introduced into a first reactor, and the residence time in the first reactor is adjusted so that the conversion of the sulfurous acid anhydride to anhydrous sodium dithionite is within the range of 25 to 50%; the remainder of the sulfurous acid anhydride is introduced into a second reactor; and the reaction temperature in any given reactor is maintained at a point not lower than the reaction temperature in the immediately preceding reactor.

REFERENCES:
patent: 2010615 (1935-08-01), Vanderbilt et al.
patent: 3887695 (1975-06-01), Plentovich et al.
patent: 3897544 (1975-07-01), Maeda et al.

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