Method for producing sodium dithionite

Details Method for producing sodium dithionite Method for producing sodium dithionite

1985-05-20

1986-08-12

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C01B 1766

Patent

active

046055452

ABSTRACT:
Disclosed is a process of producing anhydrous sodium dithionite by contacting sulfur dioxide-containing formamide and sodium amalgam, separating a sodium dithionite-containing formamide solution from the sodium amalgam and precipitating anhydrous sodium dithionite from the product formamide solution by mixing the sodium dithionite-containing formamide solution with isopropanol, n-propanol, gamma-butyrolactone, tetrahydrofuran or N-methyl-2-pyrrolidone. The sulfur dioxide may be contacted countercurrently with the sodium amalgam in a continuous process. A neutralizing agent can optionally be added to the sodium dithionite-containing formamide solution separated from the amalgam to reduce acidic decomposition of the sodium dithionite.

REFERENCES:
patent: 1477130 (1923-12-01), Kuhne et al.
patent: 2084651 (1937-06-01), Mecklenburg et al.
patent: 2172275 (1939-09-01), Dehnert
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patent: 2938771 (1960-05-01), Avedikian
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patent: 4100098 (1978-07-01), Magan
Formation of Sodium Dithionite From Sodium Amalgam and Sulfur Dioxide in Nonaqueous Media, Robert G. Rinker et al, 8, 338-347 (1969) (I&EC Product Research and Development).

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