Everything about Acid Gas totally explained
Acid gas is
natural gas or any other gas mixture which contains significant amounts of
hydrogen sulfide (H
2S),
carbon dioxide (CO
2), or similar contaminants. The terms
acid gas and
sour gas are often incorrectly treated as synonyms. Strictly speaking, a
sour gas is any gas that contains hydrogen sulfide in significant amounts; an acid gas is any gas that contains significant amounts of
acidic gases such as
carbon dioxide (CO
2) or hydrogen sulfide. Thus, carbon dioxide by itself is an acid gas but not a sour gas.
Before a raw natural gas containing hydrogen sulfide and/or carbon dioxide can be used, the raw gas must be treated to reduce impurities to acceptable levels and this is commonly done with an
amine gas treating process. The removed H
2S is most often subsequently converted to by-product elemental
sulfur in a
Claus process.
Processes within oil refineries or natural gas processing plants that remove
mercaptans and/or hydrogen sulfide are commonly referred to as
sweetening processes because they result in products which no longer have the sour, foul odors of
mercaptans and hydrogen sulfide.
Hydrogen sulfide is a
toxic gas. It also restricts the materials that can be used for
piping and other equipment for handling sour gas, as many metals are sensitive to
sulfide stress cracking.
Further Information
Get more info on 'Acid Gas'.
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