Production of alkali metal dithionites from sulfur dioxide, alka

Details Production of alkali metal dithionites from sulfur dioxide, alka Production of alkali metal dithionites from sulfur dioxide, alka

1978-05-16

1980-08-19

Cooper, Jack

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

C01B 1766

Patent

active

042184290

ABSTRACT:
A batch process, in which a sodium bisulfite compound is the alkaline agent, is described for producing anhydrous sodium dithionite at high productivity by reduction of sulfur dioxide with the formate radical in concentrated aqueous methanolic solution. Minimum amounts of water, in which sodium formate is dissolved, and of methanol, in which sulfur dioxide is dissolved, are used. The process provides the optimum productivity of U.S. Pat. No. 3,887,695 while obviating the hazards and freeze-up difficulties that are inherent in forming and transferring a sodium hydroxide solution at 160.degree. C. and also minimizes the amount of methyl formate formed at equilibrium after a large number of methanol recyclings.

REFERENCES:
patent: 3897544 (1975-07-01), Maeda et al.
patent: 3917807 (1975-11-01), Yasue et al.
patent: 3927190 (1975-12-01), Yoshikawa et al.
patent: 4127642 (1978-11-01), Bostian

Affiliated with

Also associated with

Rating

Production of alkali metal dithionites from sulfur dioxide, alka does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Production of alkali metal dithionites from sulfur dioxide, alka, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of alkali metal dithionites from sulfur dioxide, alka will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1427618