22 Questions
What is the predominant constituent of natural gas?
Methane
What are some of the hydrocarbon constituents found in natural gas, in decreasing percentages?
Ethane, propane, butane, hexane
What contaminants can be found in the natural gas stream?
Carbon dioxide, hydrogen sulfide, helium
Which of the following is NOT a main function of natural gas plants mentioned in the text?
Extract and transport liquid natural gasoline
Which facility function depends on the nature of the gas well and the composition of the gas?
Re-pressurizing the gas
What is another term used to refer to liquid natural gasoline found in natural gas streams?
Condensate
What is the Claus reaction for the production of elemental sulfur?
2H2S + SO2 → 3S + 2H2O
How is nitrogen typically removed from the gas stream in a natural gas processing plant?
Cryogenic distillation
What is the main purpose of the Claus process in natural gas processing?
To recover elemental sulfur
In the liquefaction stage of natural gas processing, what is the typical temperature range for sub-cooling?
-100 to -125°C
Which gas is most commonly used as a refrigerant in the pre-cooling stage of natural gas liquefaction?
Propane
What is the primary method for hydrocarbon recovery in modern natural gas processing plants?
Cryogenic turboexpander followed by a fractionating process
What is the primary purpose of the absorption process in natural gas processing?
Absorption removes hydrogen sulfide and carbon dioxide (acid gases).
What is the main purpose of acid gas removal in natural gas processing?
To prevent corrosive damage to equipment and pipelines.
What is the purpose of stabilization in the natural gas processing sequence?
To flash off gases from the liquid hydrocarbons at low pressure.
What is the primary method used for cryogenic removal of high concentrations of CO2 in natural gas processing?
Expansion turbine
How is dehydration accomplished in the natural gas processing sequence?
By absorbing water through contact with a glycol mixture
Which stage involves sending hydrogen sulfide removed from natural gas to the sulfur plant for sulfur recovery?
Absorption
In which stage does cooling of the inlet gas occur in a typical compression process?
Inlet Compression
What is one of the purposes of recompression in natural gas processing?
To increase pressure for sales or fuel gas use.
What is a common method used in acid gas removal processes in natural gas processing?
Fractionators
Which type of compressor is typically used for reservoir pressure maintenance gas injection in natural gas processing?
Reciprocating compressors
Learn about the process of purifying natural gas tapped from gas wells to remove contaminants before use. Understand the composition of natural gas, with methane being the predominant constituent. Explore the hydrocarbon constituents found in natural gas.
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