Ethane recovery system

Details Ethane recovery system Ethane recovery system

1989-11-21

1989-07-25

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 481, F25J 302

Patent

active

048510203

ABSTRACT:
A method of recycling a portion of the overhead vapor stream to enhance ethane recovery from a demethanizer. After the overhead vapor stream is discharged from the demethanizer, a portion of it, reflux, is compressed in a cyrogenic compressor to a pressure greater than that of the demethanizer. Afterwards the pressurized reflux is chilled in a heat exchanger causing at least a portion of it, and preferably all of it, to condense to a liquid. The pressure of this condensed reflux is then equalized to that of the demethanizer across a recycle valve so that a liquid reflux can be fed back to the top of the demethanizer. This recycling of a liquid reflux enhances ethane recovery as a column bottoms product from the demethanizer.

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patent: 4687499 (1987-08-01), Aghili

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