Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-01-12
1991-03-26
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 62, 55 68, 55162, 55179, 55387, B01D 5304
Patent
active
050025910
ABSTRACT:
Improved operating efficiency is achieved in a PSA gas concentrator by connecting the primary product gas outlet end of a pressurized sieve bed with a gaseous mixture receiving end of a second molecular sieve bed between each pressure reversal portion of a PSA gas separation cycle. A cross over valve (12) has a first mode (12a) in which a first bed (16) is connected to a source (10) of pressurized air and a second bed (18) is connected with an exhaust port (14), a second mode (12b) in which the second bed is connected with the source of pressurized air and the first bed is connected with the exhaust port, and a third mode (12c) in which the passage of gas between the pressurized air source, the exhaust port, and the first and second beds is prohibited. Check valves (50a, 50b, 50c, and 50d) and a pressure equalization valve (52) selectively interconnect second ends (22, 26) of one bed with the first ends (20, 24 ) of the other. Primary product valves (54a, 54b) selectively interconnect the sieve beds with a primary product outlet port (34) and to the other sieve bed by feedback restricters (36, 40). When the cross valve is in either the first or second mode (12a, 12b) the pressure equalization valve (52) is closed and the product valves are open. When the cross over valve is in the third mode (12c), the primary product valves (54a, 54b) are closed and the pressure equalization valve (52) is opened. This allows the primary product gas to pass from the output end of the pressurized bed into the input end of the purged bed.
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Spitzer Robert
VBM Corporation
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