p.o6.4

What is the purpose of gas sweetening?

• To increase the heating value of natural gas

• To convert hydrogen sulphide into elemental sulphur

• To remove acidic components from raw natural gas

• To reduce the carbon dioxide content in natural gas

• No correct answer

What is the maximum allowable H2S content in residue gas before it reaches the fuel market?

• No correct answer

• 57 ppm

• 228 ppm

• 57 ppm

• 57 ppm

Which of the following is NOT a reason for removing contaminants from the feed gas?

• No correct answer

• The corrosive effects on pipelines and equipment

• The pungent odour of acid gases

• The reduction of the heating value of natural gas

• The ability to convert hydrogen sulphide into elemental sulphur

Which classification of gas sweetening methods uses caustic soda or lime carbonate as the sweetening agent?

• No correct answer

• Regenerative methods

• Liquid sweetening methods

• Solid sweetening methods

• Non-regenerative methods

Which type of sweetening agent is most commonly used in liquid sweetening methods?

• No correct answer

• Solid sweetening mediums

• Caustic soda

• Lime carbonate

• Alkanolamines

What is the main disadvantage of non-regenerative methods?

• They are less effective in removing acidic components

• They are not economical to operate in the long run

• They cannot remove traces of toxic gases

• They require large amounts of sweetening agents

• No correct answer

Which type of gas sweetening method uses sweetening solutions discovered and developed by the gas processing industry?

• Regenerative methods

• Non-regenerative methods

• Liquid sweetening methods

• Solid sweetening methods

• No correct answer

What is the primary concern with carbon dioxide in natural gas?

• No correct answer

• It reduces the heating value of the gas

• It produces sulphur dioxide as a combustion by-product

• It can cause corrosion in the presence of free water

• It is extremely poisonous and harmful to humans

Which of the following compounds is NOT mentioned as a sulphurous compound that may be contained in natural gas?

• Carbon dioxide (CO2)

• Carbon disulphide (CS2)

• Carbonyl sulphide (COS)

• No correct answer

• Mercaptans (RSH)

Which of the following processes is considered the foremost among the regenerative liquid processes for absorbing acid gases?

• Glycol processes

• Amine processes

• Membrane processes

• Solid bed processes

• No correct answer