This week's Chemical E-Book topic highlight is: Pressure swing adsorption

Pressure swing adsorption (PSA) is a widely used technology for the purification of gases. A system of vessels is used to alternate between adsorbent filled vessels, one vessel being on line and removing moisture at high pressure, and the other off line releasing the trapped moisture at low pressure, to thoroughly dry a gas.

Continuous monitoring of the discharge from a PSA system is necessary, especially when looking to meet permit requirements.

For a more detailed look at this application, check out this case history: 

A manufacturer of inorganic chemicals uses a Pressure Swing Adsorption System (PSA) to recover VOCs from their marine terminal storage, loading and process vent streams.

In order to meet permits, they were required to monitor for trace levels of EDC (ethylene dichloride) from the vent stream of the PSA system. The analyzer had to measure in the low ppm range, be reliable and withstand the environmental conditions of the application. 

They decided on the Model SNR650, Flame Ionization Detector. It is an industrial strength design that measures VOCs in the low parts per million range, mounts directly onto the process ductwork, is highly reliable and has very fast total system response.


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