Oxygen-depleted air

The third polymer hsted in Fig. 7.4 has a very different structure in comparison with the polyacetylenes. The Teflon AF2400 is a perfluorinated random copolymer composed of 13 mol% tetrafluoroethylene and 87 mol% 2,2-bis(tri-fluoromethyl)-4,5-difluoro-l,3-dioxole. Its extraordinarily high gas permeabiUty was first described by Nemser and Roman [287]. Composite membranes fabricated from this polymer are currently being tested on a pilot scale by Compact Membrane Systems, Wilmington. An attractive application seems to be the production of oxygen-enriched or oxygen-depleted air for mobile diesel engines [288] and the separation of supercritical carbondioxide [289]. 

Well Site Safety. Containment of a foam drilling fluid into a closed loop system provides a measure of safety that open systems do not allow. Hydrocarbons, acid gases and oxygen depleted air are kept safely away from personnel. Additionally, open foam pits can create a hazard, as they are typically plastic lined pits, that could allow the unknowing person to slip in and possibly suffocate under a blanket of foam. 

Exit stream 1 contains oxygen-depleted air, while exit stream 2 contains a concentrated mixture of carbon monoxide and hydrogen. 

The exit temperature of the oxygen depleted air is 90°C, 363 K, which is the operating temperature of the fuel cell stack. 

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