反応 #1687654

反応方程式

sulfur dioxide

caustic soda

sodium sulfite

→

sodium metabisulfite

反応条件

後処理

1. 1
   workup.ADDITIONthereof is added

実験手順

Sulfur dioxide is introduced into a solution of sodium sulfite and sodium bisulfite to form sodium bisulfite in a solution having dissolved sulfur dioxide present with a pH between 3.5 and 4.2. The solution is drawn to a cooling crystallizer where an alkali such as soda ash, caustic soda, sodium sulfite, and mixtures thereof is added to produce additional sodium metabisulfite that increases the yield of sodium metabisulfite crystallizing per pass. The mother liquor is recycled.

出典