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PRESSURE SWING ADSORPTION Gas separation and purification Pressure swing adsorption is a process that separates single gases from a gas mixture. It is mainly used in chemical and petrochemical processes as well as the steel industry, for example to recover hydrogen (H2) from coking or conver- sion gases, or to separate oxygen (O2) and nitrogen (N2) from air. The adsorption process is based on gas molecules binding to an absorbent material. The adsorbent bed is specially se- lected depending on the gas to be absorbed. Ideally, only the gas to be separated is adsorbed, while all other gases in the mixture pass through the adsorbent bed. Frequently, absorbents containing carbon (e.g. activated carbon or car- bon molecular sieves) and oxide absorbents (e.g. zeolite) are used. The purity of the absorbed gas not only depends on the adsorbent used. The temperature and pressure during the process are important as well. As a result, the control valves used also contribute considerably to the quality of the end product. Hydrogen Feed 6 Absorbent Absorbent Purging gasPDF Image | Pressure Swing Adsorption
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