Rich, low pressure gas may be found from a number of sources including associated gas (from crude oil production) and various refinery and petrochemical off-gas streams. Typically this low pressure gas is vented to flare or simply used as fuel gas. However this rich gas contains valuable recoverable hydrocarbons including LPG (propane and butanes). Most licensed and open art LPG recovery process schemes were developed to handle high pressure gas streams (typically 550 psi or higher). Considerable feed gas compression is required to process low pressure gas when utilizing these high pressure process schemes, and the low pressure gas is often deemed economically stranded. A new process technology (named PRO-MAX) has been specifically developed to overcome the challenges of processing rich, low pressure gas streams. Total required compression horsepower is typically 15-30% less than traditional high pressure process schemes while efficiently achieving virtually 100% overall propane recovery.
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