22 Questions
What is the predominant constituent of natural gas?
Methane
Why is it necessary to purify natural gas before use?
To remove impurities that are objectionable to pipeline transmission companies
What are some hydrocarbon constituents found in natural gas besides methane?
Ethane, propane, and butane
What is the function of separating and removing entrained liquid hydrocarbons in natural gas plants?
To prevent corrosion in the pipelines
Why does natural gas need to be re-pressurized for transmission purposes?
To maintain the pressure needed for long-distance transportation
What are some common contaminants found in natural gas streams?
Carbon dioxide and water vapor
What is the main purpose of the Claus process described in the text?
Producing elemental sulfur
How is nitrogen typically removed from natural gas in modern plants?
By cryogenic distillation
Which of the following is NOT extracted in the hydrocarbon recovery process described?
Pentane
In what temperature range is the pre-cooling stage of liquefaction typically carried out?
-30 to -50°C
Which refrigerant is typically used during the liquefaction stage of natural gas processing?
Methane
What is the primary method used for helium removal/production from helium-bearing natural gas?
Cryogenic distillation
What is the purpose of absorption in the natural gas production process?
To absorb hydrogen sulfide and carbon dioxide using an amine solution
What is the primary reason for dehydration in the natural gas production process?
To remove water through contact with a glycol mixture
In natural gas production, what is the purpose of stabilization?
To remove gases at low pressure from liquid hydrocarbons
What is the primary function of recompression in the natural gas production process?
To increase the pressure of gases for sales or fuel gas use
What is the purpose of acid gas removal in natural gas processing?
To prevent corrosive damage and meet regulatory requirements
Why is sulfur recovery using the Claus process necessary in natural gas processing?
To meet regulatory requirements and avoid harm to the environment
What happens during cryogenic removal in the natural gas processing?
The gas stream flows through an expansion valve to lower pressure and temperature
What is typically used for low-pressure compression in natural gas production?
Reciprocating compressors
What is used in acid gas removal to absorb H2S and CO2?
Amine solutions like monoethanolamine (MEA)
What kind of gases are treated by absorption in natural gas production?
Hydrogen sulfide and carbon dioxide (acid gases)
Test your knowledge about natural gas plants, including the purification process and the composition of natural gas. Learn about the hydrocarbon constituents of natural gas and their uses in different industries.
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