Description:
Membrane air separation experiment, showing air filter and pressure regulator, two Permea membrane modules with valving to permit series or parallel operation, Omega pressure transducer with panel meter, needle valve for flow control, Sierra mass flow meters on tube side (low O2) and shell side (high O2) flows, Engineered Systems oxygen meters on tube and shell side streams. Air source is a standard cylinder of dry compressed air.
Detailed Overview:
The apparatus consists of two Permea air separation modules, connected by stainless tubing and valves. Each module contains hundreds of polymeric tubes, the walls of which are more permeable to oxygen than to nitrogen. Dry air from a standard cylinder passes through a filter to a pressure regulator, which permits setting the operating pressure at which the modules operate. Air flow through the tube side (fiber lumen side) of the membrane modules can be parallel or series. Effluent air from tube sides of the modules is combined and passes to a needle valve used to control the total tube side flow rate. It then flows to a Sierra mass flow meter and an Engineered Systems electrochemical.
The basic data for each run thus consists of the flow configuration (parallel or series), operating pressure, tube side flow rate and oxygen n level, and shell side flow rate and oxygen level. A typical run takes about one minute, and consumes little air. The data can be processed to produce values for the oxygen and nitrogen permeability coefficients of the module fibers.
The apparatus typically operates at room temperature.
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