Sulfur Dioxide → Potassium Metabisulfite

反応式

[OH-].[K+:2].C(=O)([O-])[O-].[S:7](=[O:9])=[O:8].[S:10](=[O:13])([OH:12])[O-:11].[K+]>>[S:10]([S:7]([O-:9])=[O:8])([O-:12])(=[O:11])=[O:13].[K+:2].[K+:2]

参加物

反応物 4

HCID 1119Sulfur Dioxide2 回

HCID 14797Potassium Hydroxide

HCID 19660Carbonate Ion

HCID 23663620Potassium Bisulfite

生成物 1

HCID 28019Potassium Metabisulfite

実験手順

In U.S. Pat. No. 3,369,866, potassium hydroxide or carbonate and sulfur dioxide are reacted in potassium bisulfite solution at a pH of 4 to 7.5, and a temperature of 50° to 80° C. The solution is transferred to a second vessel where its pH is reduced to 5.5 by the addition of more sulfur dioxide in order to prevent precipitation of potassium sulfite, and the solution is cooled to 15° to 25° C. to obtain a crop of potassium metabisulfite crystals. The main concerns are to avoid product oxidation and the inclusion of sulfite in the product. No mention is made of crystal size.