| 摘要 |
A method and system for recovering natural gas liquids (NGLs) from hydrocarbon mixtures and for producing a pipeline quality natural gas (NG) stream from a NG stream with a BTU content greater than about 1100 BTU per standard cubic foot. An NG or petroleum gas stream containing NGLs is delivered to a crossflow semipermeable membrane filtration apparatus wherein the semipermeable membrane is wetted with an organic liquid to render the membrane oleophilic. The NG stream is delivered at a pressure of at least about 150 psig. NGLs permeate through the wetted oleophilic membrane at a backpressure of at least 120 psig and maintain the desirable membrane characteristics; they are collected as liquids at a pressure of at least about 15 psig. A pipeline quality, primarily methane retentate stream of not greater than about 1050 BTU/ scf is produced. |
