Environmental Engineering Reference
In-Depth Information
Chapter 7
Membranes
One can also use membranes to separate gasses. Normally
membranes operate using a large pressure difference, but fl ue
gas is at the “end of the pipe,” and thus the exhaust pressure is
very close to atmospheric pressure. Compressing fl ue gas is
very expensive, so membrane separation does not look very
attractive for carbon capture. We show that one can neverthe-
less arrive at promising process options by immersing oneself
into the physics and chemistry of the membrane, then using that
knowledge in clever process design schemes.
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