The design principle of membrane-based oil and gas recovery equipment relies on the varying permeation rates of gas molecules through polymer membranes; by utilizing selective permeation to separate and recover oil and gas mixtures, the system achieves emission reduction and resource recycling.
Membrane materials exhibit distinct solubility and diffusion coefficients for different gas molecules. Volatile organic compounds (such as hydrocarbons) typically possess higher solubility and diffusivity within the membrane compared to air components; consequently, driven by pressure or concentration gradients, the organic constituents of the oil and gas mixture preferentially permeate the membrane material, thereby effecting gas separation.
Structural designs typically employ hollow-fiber or spiral-wound membrane modules to maximize effective membrane area and enhance separation efficiency. Furthermore, optimizing membrane layer thickness and pore structure balances selectivity with gas flux, enabling the system to achieve high-efficiency processing within a compact footprint.
In terms of operation, the separation process is generally driven by a pressure differential-created by compressors or vacuum pumps across the membrane-which ensures the continuous flow of oil and gas through the membrane modules for separation. Hydrocarbon gases on the feed (retentate) side are collected and recovered, while the purified gas on the permeate side is either discharged or subjected to further treatment.
Membrane separation units are typically integrated with pre-treatment, compression, and post-treatment modules to prevent oil mist or particulates from compromising membrane performance, as well as to enhance overall system stability and service life, thereby ensuring continuous, efficient oil and gas recovery operations.