Patent ID: 9568242
Date: 2017-02-14
CPC Classifications: F25J

Claim:
1. A gas processing plant for processing a feed gas, comprising: a feed gas source configured to provide a feed gas comprising at least 0.5 mol % CO a first heat exchanger, a first turboexpander, and a second heat exchanger, coupled to each other in series and configured to cool and expand the feed gas; a separator fluidly coupled to the second heat exchanger and configured to separate the cooled and expanded feed gas into a liquid phase and a vapor phase; a second turboexpander coupled to the separator and configured to expand a first portion of the vapor phase to thereby produce an expanded first portion, and to deliver the expanded first portion to a demethanizer to thereby strip CO a third heat exchanger and a pressure reduction device that are coupled to each other and configured to receive and condense a second portion of the vapor phase to thereby form a reflux to the demethanizer; and a fourth heat exchanger configured to use a deethanizer overhead product from a deethanizer or a demethanizer overhead product as a heat source to heat a side draw of the demethanizer to a temperature suitable to strip CO