Main Uses

In chemical industry:

in the production of hydrosulphites, sulfoxilates, sulphites, bisulphites, thiosulphates, sulphonates, chlorine dioxide and sulphuryl-chloride, sulphitated aethanolamines, chromium basic sulphate, manganese sulphate, phtalic anhydride, caprolactame, acrylonitrile, dye intermediates.

In sugar and wine industries:

as antifermentative, bacteriostatic, antioxidant and preservative.

In food industry:

In the preserving and bleaching treatment of dried and candied fruit, fruit in syrup, citrus fruit, cherries, apples, fruit juices, potatoes, cereals, mushrooms, animal fats and oils.

In the starch production:

as bacteriostatic.

In the bee-keeping:

as larvae killer of some parasite species.

In the waste water treatment:

as reductant of metallic ions and as oxidant of sulphides and cyanides.

In drinking water treatment:

in order to remove the excess of chlorine.

In pulp mills:

in wood cooking phase or as bleaching agent.

In metallurgical industry: 

  • In order to produce a reducing ambient during magnesium casting.
  • In the extraction and refining of some metals from their ores.

In pharmaceutical industry: 

as antiseptic and disinfectant.

In the petroleum refinery: 

as solvent of sulphur-, oxygen- and nitrogen-containing compounds from kerosene and light oils.

In the glass manufacture: 

as acidifying agent.

In electric power plants: 

for conditioning stack gas to facilitate removal of fly ash.

As a refrigerant:

being easily condensed and possessing a high heat of evaporation, sulphur dioxide is a candidate material for refrigerants.