Page 279 - Pressure Swing Adsorption

ii.I
256 PRESSURE SWING ADSORPTION PSA PROCESSES 257

-30·90%
OXYGEN

ZEOLITE
TIME (SECONDS)
II 0
I 'i.02.I A ~ J
ALUMINA I II~
A - AIR FLOW (PRODUCT 0 2 )
D1 ~ DESORPTION I {WASTE)
~ 02 = DESORPTION II (PRODUCT H2)
WASTE
- -'-'---Si- (\ - PRESSURIZATION
P
"v1 i I !ii I COMPRESSOR
I ct-99.0 +%
, (!J
VACUUM PUMP , n g r)
AIR 2 NITROGEN
1
, ~_J l z.:c/ c
~V2 '--.._./
VACUUM PUMP
la)
1000
PA = 840 TORR; P 0 = 70 TORR
TOTAL DESORBED - 0.507 MOLES / Kg
.... 800
0 CaX ZEOLITE a:
:::, a:
D 0
0 ....
a:
0.. "'
z 10 a:
:::,
"' "'
(!J
0 8 "'
a: 400 "'
....
a:
z 6 0.
z
;;;, ::,
4 :::,
N 200 .J
0 0
* 2 0
0 0
0 0.2 0.4 0.5 0.8 1.0
FRACTION DESORBED ~
(b)
Figure 6.24 The Air Products FVSA a1r separation process. '(a) Process schematic;
3
(b) performance data. (From Sircar, () with perm1ss10n.)