Acid gas


Acid gas is natural gas or any other gas mixture which contains significant amounts of hydrogen sulfide (H<sub>2</sub>S), carbon dioxide (CO<sub>2</sub>), or similar contaminants. Although the terms acid gas and sour gas are used interchangeably, strictly speaking, a sour gas is any gas that contains hydrogen sulfide in significant amounts. Whereas an acid gas is any gas that contains significant amounts of acidic gases such as carbon dioxide (CO<sub>2</sub>) or hydrogen sulfide. Thus, carbon dioxide by itself is an acid gas but it is not a sour gas.