Evonik is expanding its membrane business with its PuraMem VOC for the separation of volatile organic compounds (VOCs). It is a polymer-based membrane technology for the separation of long-chain hydrocarbons from a natural gas or nitrogen mixture. With a spiral-wound membrane module, it is suitable for natural gas treatment, emission control in tank farms, and in chemical and process industries.
The membrane technology functions on the basis of the different molecular sizes of the substances to be separated. As the gas mixture streams through the membrane at a pressure of up to 80 bar, the larger VOC molecules pass through the membrane while the smaller gas molecules are retained.
