Natural gas from high-pressure wells is usually passed through field separators at the well to remove
hydrocarbon condensate and water. Natural gasoline, butane, and propane are usually present in the gas, and
gas processing plants are required for the recovery of these liquefiable constituents (see Figure 5.3-1).
Natural gas is considered "sour" if hydrogen sulfide (H S) is present in amounts greater than 5.7 milligrams 2
per normal cubic meters (mg/Nm ) (0.25 grains per 100 standard cubic feet [gr/100 scf]). The H S must be 3
2
removed (called "sweetening" the gas) before the gas can be utilized. If H S is present, the gas is usually 2
sweetened by absorption of the H S in an amine solution. Amine processes are used for over 95 percent of 2
all gas sweetening in the United States. Other methods, such as carbonate processes, solid bed absorbents,
and physical absorption, are employed in the other sweetening plants. Emission data for sweetening
processes other than amine types are very meager, but a material balance on sulfur will give accurate
estimates for sulfur dioxide (SO ).
Natural gas from high-pressure wells is usually passed through field separators at the well to removehydrocarbon condensate and water. Natural gasoline, butane, and propane are usually present in the gas, andgas processing plants are required for the recovery of these liquefiable constituents (see Figure 5.3-1).Natural gas is considered "sour" if hydrogen sulfide (H S) is present in amounts greater than 5.7 milligrams 2per normal cubic meters (mg/Nm ) (0.25 grains per 100 standard cubic feet [gr/100 scf]). The H S must be 32removed (called "sweetening" the gas) before the gas can be utilized. If H S is present, the gas is usually 2sweetened by absorption of the H S in an amine solution. Amine processes are used for over 95 percent of 2all gas sweetening in the United States. Other methods, such as carbonate processes, solid bed absorbents,and physical absorption, are employed in the other sweetening plants. Emission data for sweeteningprocesses other than amine types are very meager, but a material balance on sulfur will give accurateestimates for sulfur dioxide (SO ).
การแปล กรุณารอสักครู่..