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Figure 2.4 shows a typical NGL recovery process used in natural gas processing.

Figure 2.4 Turboexpander process (stream 19 shows the recovery of recompression work).

In all cases except for Feed #1 (for reasons discussed later), NGL recovery is done via the turboexpander process. This process is used to separate methane from the NGLs. A key feature of this process is the turboexpander, which is used to recover some recompression work done by the gas (see Figure 2.4). Another key feature of the process is the compact (brazed aluminum) heat exchanger. These exchangers can achieve much closer approach temperatures and can operate at much lower temperatures than can shell‐and‐tube exchangers [34].