An existing liquefaction process produces 10 kg/s of liquid methane at steady state. Which of the following modifications to the process would be expected to decrease the total amount of work required to produce 10 kg/s of liquid methane?
A. Feed the methane at a higher flow rate.
B. Use an inert carrier gas for the methane.
C. Use a bigger pump in the process.
D. Recycle the cold but not liquefied methane to chill the stream entering the flash chamber.
E. None of these options
A. Incorrect. The goal is to compress the methane more efficiently, not to make more liquid methane per second.
B. Incorrect. This would probably make the system less efficient because work would be needed to compress the carrier gas in addition to the work required to compress the methane.
C. Incorrect. We cannot know from the given information whether “bigger” means more or less efficient, and the work in the liquefaction process is conventionally delivered by compressors, not pumps.
D. Correct. This is the basis of the Linde process, which is universally used for its efficiency over simple liquefaction.
E. Incorrect. One of these options will improve process efficiency.
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