Sulfur Dioxide → Sodium Sulfite

Participants

Reaction Steps

In the upper section 3, caustic soda in solution will react with sulphur dioxide to form sodium sulphite and sodium bi-sulphite, whilst in the bottom section 5 a new balance will be favoured to produce sodium sulphate by reaction with sulphuric acid. Sufficient alkali will consequently be injected through stream 16 essentially to neutralise the sulphuric acid present in the bottom section 5. Also, sufficient water is introduced into the upper section 3 via the stream 16, or via some other source (not shown) to compensate for water flashed-off in the flash pan 9.

Provenance & Evidence