Technology  [ Return towards  CO2 membrane  ]

Carbon Dioxide (and/or H2S ) is separated from natural gas (CH4) by selectively permeation through a hollow fiber membrane (see the table below). The driving force is the partial pressure difference across the membrane for CO2 (and/or H2S) , CH4 and other gas components. CO2 (and/or H2S) is the “fast” gas whereas CH4 is the “slow” gas. membrane technology is based on polymeric hollow fiber. The pressurized feed gas enters the bundle from the shell side, the methane stays under pressure, and the CO2 (and/or H2S) is collected at a lower pressure. High selectivity makes 95%+ methane recovery available.

's membrane modules provide for safe and efficient purification of natural gas by selective removal of CO2 , H2S and water vapor.  membrane systems can be used as the sole treatment step, for example, to meet pipeline specification 2 to 5% CO2 (4 ppm H2S). The membranes can also be used as a pretreatment step where the majority of CO2 (and/or H2S) is reduced to an intermediate level. Further removal of CO2 is performed by a secondary process (amine system).

Membrane technology is especially suited for remote locations where utilities are scarce. Membranes are an environmentally friendly alternative to traditional amine treatment processes.

A typical membrane system consists of a pre-treatment skid and a series of membrane modules. The system is highly adaptable to accommodate treatment of various gas volumes and product-gas specifications. The technology’s compactness makes it the preferred technology for offshore gas treatment.