Evonik Introduces Polymer Membrane for Purifying Biogas

Evonik Industries has introduced a novel membrane for purifying raw biogas into pure, usable biomethane, by removing CO2. The technology, which is comprised of multiple cylindrical polyimide hollow fibers, “increases yield and conserves valuable resources,” the company says. Biogas to be purified is introduced under high pressure at one end of the membrane, Evonik says. CO2 molecules are smaller and more soluble in polymers than methane molecules and so pass through the micropores in the polyimide and are separated from the methane. CO2, water vapor...

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