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The oil and gas recovery membrane is a multi-layer composite material with an alkane-resistant ultrafiltration membrane as the support layer, a high-molecular polymer as the functional layer, and a selective transmittance function for alkane compounds.The functional membrane material has a high affinity with gasoline molecules, which can quickly adsorb gasoline molecules on the surface of the membrane, and move and enrich to the downstream side of the membrane under vacuum, so that most of the oil and gas are returned to the oil storage tank in the form of liquid oil and supersaturated oil and gas. After purification, the air components in the oil and gas are environmentally friendly and discharged into the atmosphere.