Membrane Gas Separation

230
400
 – 
60
Cooling water, t/h
38
38
64
99
Investment, $ millions
1.12
0.91
2.03
2.66
Installation area, m 
2
8
5
60
120
Metrics
Energy intensity, kJ/kg H 
2
2808
2738
5760
4853
Mass intensity, kg/kg H 
2
136
133
277
342
Productivity/footprint, kg 
H 
2
/(h m 
2
)
35
58
3.9
2.4

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Membrane Engineering: Progress and Potentialities in Gas Separations
309
As can be seen, the energy intensity of the membranes system, for both the temperature 
values considered, is lower than that of the other two processes. This means that the 
energy required for producing a fi xed amount of hydrogen is, in any case, signifi cantly 
lower than that required by the other operations. Also the addition of the steam and 
cooling water is at least half of that necessary for the traditional systems. The productivity 
to footprint ratio calculated for the membrane technology is very interesting in the process 
intensifi cation logic. Considering the same area occupied by the unit, the membrane 
systems show more than tenfold higher productivity.
References 
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