Typically, the design of the front section of the NGL recovery unit is controlled by the rich gas case operating in the summer, as the refrigeration duty is highest for that case. If nitrogen injection is considered for enhanced recovery in the same hydrocarbon formation, a higher nitrogen feed gas case must be considered in the design. The NGL process must be designed to handle a rich gas case and a lean gas case. Unlike an AGRU, the NGL recovery process selection must be evaluated based on meeting the NGL recovery levels, feed gas pressure, temperature, gas compositions, and product specifications, and NGL recovery flexibility. There are numerous NGL patents and proprietary technologies for NGL recovery.
Mak, in Handbook of Natural Gas Transmission and Processing (Fourth Edition), 2019 4.3.2.4 Natural Gas Liquid Recovery and Fractionation
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