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Two membrane modules are provided
and may be valved into either series or parallel operation.
Dry air from a cylinder
passes to a filter and then to a pressure regulator. The air is fed into the fiber lumen,
corresponding to the tube side of the module, and its pressure is shown on a
digital meter.
The flow of gas through the fibers
is controlled by a needle valve at the exhaust of the fiber side, and passes
from the valve to a mass flow meter and then to an oxygen analyzer. Similarly,
the permeate gas from the shell side of the module, at essentially atmospheric
pressure, passes through a mass flow meter and then an oxygen analyzer. When
the modules are connected in parallel, the tube side effluent streams are
combined before flow and oxygen level measurement. This is also done for the
shell side effluent streams.
Each run is made by using the
pressure regulator to set the operating (tube side) pressure. Then the needle
valve is used to set the tube side effluent flow rate. When a steady state has
been reached, students record the percent oxygen and flow rates on both the
tube the shell sides.
A house air supply (compressor and dryer), a PID controlled process heater, or
differential pressure measurement across the fiber lumen may be selected as
options.
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