Distinguish between sweet gas and sour gas.

Distinguish between sweet gas and sour gas.

• A. Sweet gas has low or no H2S; sour gas contains H2S and often higher CO2 requiring sulfur removal.
• B. Sweet gas has high H2S content.
• C. Sweet gas has no methane.
• D. Sweet gas has higher dew point than sour gas.

Answer: (A)

Sweet gas is defined by having little to no hydrogen sulfide (H2S); sour gas contains H2S in detectable amounts and is often accompanied by higher carbon dioxide (CO2). Because H2S is toxic and corrosive, sour gas typically requires sulfur removal (gas sweetening) before it can be safely transported, and there may also be CO2 removal for acid-gas management. In contrast, sweet gas may still contain CO2, but the key distinction is the H2S content—the absence or very low levels of H2S make it sweet. The other statements don’t fit: high H2S would indicate sour gas, not sweet; natural gas is predominantly methane regardless of sweetness; dew point differences are not what defines sweet versus sour, as dew point relates to moisture content rather than sulfur compounds.

Sweet gas is defined by having little to no hydrogen sulfide (H2S); sour gas contains H2S in detectable amounts and is often accompanied by higher carbon dioxide (CO2). Because H2S is toxic and corrosive, sour gas typically requires sulfur removal (gas sweetening) before it can be safely transported, and there may also be CO2 removal for acid-gas management. In contrast, sweet gas may still contain CO2, but the key distinction is the H2S content—the absence or very low levels of H2S make it sweet. The other statements don’t fit: high H2S would indicate sour gas, not sweet; natural gas is predominantly methane regardless of sweetness; dew point differences are not what defines sweet versus sour, as dew point relates to moisture content rather than sulfur compounds.