Environmental Engineering Reference
In-Depth Information
CO 2 permeance
40
Base case
membrane
1000 gpu
30
2000 gpu
20
4000 gpu
10
0
0
0 0
0
0
Membrane CO 2 /N 2 selectivity
Figure 7.3.8 Selectivity versus costs
Effect of membrane CO 2 /N 2 selectivity on the cost of capturing 90% of the CO 2 in fl ue
gas for membranes with a CO 2 permeance of 1,000, 2,000, and 4,000 gpu at a fi xed
pressure ratio of 5.5. Figure based on data from [7.1].
and the capital costs. Clearly, we now see that fi nding materials with an
optimal selectivity and high CO 2 permeance will have a signifi cant effect
on the carbon capture costs.
Section 4
Microscopic aspects:
diffusion
Until now we have characterized our membranes as materials with given
permeabilities. In this section and the next one, we will try to glean some
molecular level understanding of the factors that determine the permea-
bility of a material. As we have seen, the permeability is a product of
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