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A pressure swing adsorption process including an adsorption apparatus having a plurality of beds and counter-currently purging at least two of the beds simultaneously throughout the process. The number of beds and number of pressure equalization steps are not particularly limited, but a ten-bed, fou

A pressure swing adsorption process including an adsorption apparatus having a plurality of beds and counter-currently purging at least two of the beds simultaneously throughout the process. The number of beds and number of pressure equalization steps are not particularly limited, but a ten-bed, four pressure equalization step process in advantageous. In addition, other ten-bed, four pressure equalization step processes are disclosed which do not counter-currently purge at least two of the beds simultaneously, but which have an average of at least two of the ten beds being simultaneously regenerated by simultaneously providing off-gas from a feed end of each of the beds to an off-gas line.

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1. A pressure swing adsorption process comprising providing a pressure swing adsorption apparatus having ten beds, and equalizing a pressure of each of said ten beds in four steps, represented by the following cycle chart: AAAA1234PP1'RAAAA12343'2'1'RAAAA12I4'3'2'1'RAAAAGGI4'3'2'1'RAABBGGI4'3'2'1'RP

1. A pressure swing adsorption process comprising providing a pressure swing adsorption apparatus having ten beds, and equalizing a pressure of each of said ten beds in four steps, represented by the following cycle chart: AAAA1234PP1'RAAAA12343'2'1'RAAAA12I4'3'2'1'RAAAAGGI4'3'2'1'RAABBGGI4'3'2'1'RPPBBGGI4'3'2'34PPBBGGI4'1234PPBBGGAA1234PPBBBBGGI4'3'2'1'RPPBBGGI4'3'2'34PPBBGGI4'1234PPBBGGAA1234PPBBAAAA1234PP1'RAAAA12343'2'1'RAAAA12I4'3'2'1'RAAAAGGI4'3'2'1'RAAwherein A is adsorption, 1 is providing gas for a first step of pressure equalization, 2 is providing gas for a second step of pressure equalization, 3 is providing gas for a third step of pressure equalization, 4 is providing gas for a fourth step of pressure equalization, P is providing purge gas, B is counter-current blowdown, G is counter-current purge, I is idle, 4' is receiving gas for the fourth step of pressure equalization, 3' is receiving gas for the third step of pressure equalization, 2' is receiving gas for the second step of pressure equalization, and 1' is receiving gas for the first step of pressure equalization and simultaneously receiving product gas for repressurization, and R is repressurizing with product gas.