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Sour gas is a type of natural gas that contains significant amounts of hydrogen sulfide (\(H_2S\)), a toxic and corrosive compound, along with other impurities like carbon dioxide.  Unlike sweet gas, which has low levels of these contaminants, sour gas requires special handling and processing due to its hazardous properties.  The presence of hydrogen sulfide makes sour gas dangerous to human health, as it can cause respiratory issues or even be fatal in high concentrations, and it poses challenges to infrastructure because of its corrosive nature, which can damage pipelines and equipment.  Sour gas is commonly found in certain geological formations, such as deep carbonate reservoirs, and must undergo treatment processes, like amine scrubbing, to remove \(H_2S\) and other impurities before it can be safely used or transported.  These treatments are critical to meeting safety and environmental standards, as well as ensuring the gas is suitable for commercial use, such as in power generation or heating.

Sour Gas is Primarily Composed of the Following Elements 
Natural Gas (Methane, \(CH_4\))  -  the main hydrocarbon component, typically making up the majority of the gas.
Hydrogen Sulfide (\(H_2S\))  -  a toxic, corrosive gas that defines sour gas, often present in significant concentrations.
Carbon Dioxide (\(CO_2\))  -  commonly found in varying amounts, contributing to the gas's acidity.
Trace Hydrocarbons  -  small amounts of ethane, propane, or other hydrocarbons.
Water Vapor  (\(H_2O\))  -  often present, especially in untreated gas from reservoirs.
Nitrogen (\(N_2\))  -  may be present in minor quantities.
Other Impurities  -  trace amounts of sulfur compounds (e.g., mercaptans) or other gases, depending on the source.

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