Methods For Sweetening
Before a raw natural gas containing hydrogen sulfide or carbon dioxide can be used, the raw gas must be treated to remove those impurities to acceptable levels, commonly by an amine gas treating process. The removed H2S is most often subsequently converted to by-product elemental sulfur in a Claus process or it can be treated in a WSA Process unit where the by-product is sulfuric acid. Alternatively, the highly H2S concentrated gas, the by-product of the amine treatment plant, can be recompressed by compressor units specifically designed to handle highly toxic gas and injected in the reservoir.
Within oil refineries or natural gas processing plants, the removal of organosulfur compounds and hydrogen sulfide is referred to as "sweetening". The sweetened products lacks the sour, foul odors of mercaptans and hydrogen sulfide. Another product removed in sweetening is carbonyl sulfide.
Read more about this topic: Sour Gas
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