초록 ▼

Processes are disclosed for separating at least one gas from a gaseous feed mixture containing at least one other gas comprising passing the gaseous feed mixture to at least two permeator stages in series. Each permeator stage contains a separation membrane which has a feed side and a permeate exit

Processes are disclosed for separating at least one gas from a gaseous feed mixture containing at least one other gas comprising passing the gaseous feed mixture to at least two permeator stages in series. Each permeator stage contains a separation membrane which has a feed side and a permeate exit side and exhibits selective permeation of the at least one gas as compared to the permeation of the at least one other gas of the gaseous mixture. A total pressure differential is maintained across the thickness of the separation membrane in each permeator stage to provide a driving force for the permeation of the at least one gas across the separation membrane. The ratio of total pressure on the feed side to total pressure on the permeate exit side of the separation membrane for at least one permeator stage is less than the ratio of total pressure on the feed side to total pressure on the permeate exit side of the separation membrane for at least one subsequent, i.e., downstream, permeator stage. The at least one gas of the gaseous feed mixture permeates through the membrane, and a permeating gas containing the at least one gas is obtained on the permeate exit side of each of the permeator stages. Between permeator stages, the non-permeating gas from one permeator stage is passed to the feed side of the next permeator stage.

대표청구항 ▼

A process for separating at least one gas from a gaseous feed mixture containing at least one other gas comprising passing the gaseous feed mixture to at least two permeator stages in series, each permeator stage comprising a separation membrane exhibiting selectivity to the permeability of said at

A process for separating at least one gas from a gaseous feed mixture containing at least one other gas comprising passing the gaseous feed mixture to at least two permeator stages in series, each permeator stage comprising a separation membrane exhibiting selectivity to the permeability of said at least one gas as compared to the permeability of said at least one other gas in the gaseous feed mixture and having a feed side and a permeate exit side in which the permeate exit side is at a lower total pressure than the total pressure on the feed side, wherein between permeator stages, the non-permeating gas from the feed side of one permeator stage is passed to the feed side of the next permeator stage; and wherein at least one permeator stage has a lower ratio of total pressure on the feed side to total pressure on the permeate exit side than the ratio of total pressure on the feed side to total pressure on the permeate exit side of at least one subsequent permeator stage, and the total pressure on said permeate exit side of said at least one subsequent permeator stage is lower than the total pressure on said permeate exit side of said at least one permeator stage.