Sulfur Dioxide So2

Sulfur dioxide so2
cas no.: 7446-09-5
einecs no.: 231-195-2
un no.: un1079
purity: 99.9%
dot class: 2.3
appearance: colorless liquid
grade standard: industrial grade
precursor to sulfuric acid:
sulfur dioxide is an intermediate in the production of sulfuric acid, being converted to sulfur trioxide, and then to oleum, which is made into sulfuric acid.
As a preservative reducing agent:
sulfur dioxide is sometimes used as a preservative for dried apricots, dried figs, and other dried fruits, it is also a good reductant.
As a refrigerant:
being easily condensed and possessing a high heat of evaporation, sulfur dioxide is a candidate material for refrigerants.