Chemically: Sulfurous Acid,
sulfites and bisulfites, intermediate dyes, sulfonation, additive
organic compounds of SO2.
Refineries: It is
used as a selective solvent.
Paints and varnishes:
It is used for the polymerization of dry or crude oils.
Food industry: It
is used for the preservation of pulps and vegetable or fruit
juices and also in wines, sulfited musts and the malt industry.
Cork industry: It
is used as a germicide.
It is used as a preservative and germicide.
Glass industry: glasses,
lamp lightbulbs, bottles and medicine bottles; it reduces breakages
and eliminates sodium.
Rubbers and gelatins:
It is used in solubilizing processes and also as an acidulating
and preservative agent.
It is used as a bichromate and lime reducing agent, and also
as a bleacher in vegetable tannings.
It is used in precious metal refining, flotation metal treatment,
metallic oxide chlorination and magnesium smelting.
Pulps and papers: It
is used in the stabilization of pulps chemical dying and
in other applications.
Sugar mills: It is
used in sugar cane juice treatment and as a bleacher.
Other uses: in liquor
fading treatments, chlorine removal, water treatments, bed and
filter cleaning, cosmetics, photographic and plastic composites,
pH Mathienson control process, as a neutralizer, hexavalent
chrome reducer, as a bleaching agent for paper, textiles, oils,
etc. and many other applications.