In applications involving carbon dioxide separation, like biogas upgrading, there is Joule-Thomson cooling from the expansion of carbon dioxide across the membrane.
In thermodynamics, the Joule–Thomson effect describes the temperature change of a real gas or liquid when it is forced through a valve or porous plug. This procedure is called a throttling process or Joule–Thomson process. The effect is named after James Prescott Joule and William Thomson, who discovered it in 1852.
At room temperature, all gases (except hydrogen, helium and neon) cool upon expansion by the Joule–Thomson process. This throttling process is used in machines like air conditioners, heat pumps, and liquefiers to take advantage of the cooling effect.
In the biogas illustration, heat loss to the ambient surroundings will cause the membrane separators to cool, which affects productivity. These effects need to be minimized when designing systems.
Air Products PRISM Membranes has an experienced staff of process and application engineers that will work with your team to identify these types of system variables before your systems are deployed.
Contact Air Products PRISM Membranes for more information about gas separations and technical assistance.