Acid gases are those that produce acids when dissolved in water and include both CO2 and H2S. Sour gas is gas that contains H2S - the specific amount to classify it as sour varies with whom you ask!
The Texas Railroad Commission has a definition for sour-gas that you might consider. "Sour Gas - (SWR 79) Any natural gas containing more than 1-1/2 grains of hydrogen sulfide per 100 cubic feet or more than 30 grains of total sulfur per 100 cubic feet, or gas which in its natural state is found by the Commission to be unfit for use in generating light or fuel for domestic purposes."
Acid gas can be the result of processing sour gas. An amine sweetening unit may concentrate the hydrogen sulfideto nearly 50 percent. The gas effluent from removing carbon dioxide is also called acid gas.
Consider the Texas Railroad Commission has a definition for sour-gas
"Sour Gas - (SWR 79) Any natural gas containing more than 1-1/2 grains of hydrogen sulfide per 100 cubic feet or more than 30 grains of total sulfur per 100 cubic feet, or gas which in its natural state is found by the Commission to be unfit for use in generating light or fuel for domestic purposes."
Hi,
I think the complete answer might be:
Acid gas
Produce acids when dissolved in water and include both CO2 and H2S.
Sour gas
Containing hydrogen sulfide. or caused by hydrogen sulfide or other sulfur compounds.
Sweet gas
Containing little or no hydrogen sulfide or sulfur compounds.
So you are interested to compare sour gas vs. sweet gas.
