초록 ▼

Asymmetric gas separation membranes of materials having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture, exhibit significantly improved permeation selectivities for the at least one gas when the asymmetric membrane is cont

Asymmetric gas separation membranes of materials having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture, exhibit significantly improved permeation selectivities for the at least one gas when the asymmetric membrane is contacted on one or both surfaces with an effective amount of a Br nsted-Lowry acid. The improved asymmetric gas separation membranes, process for producing the improved membrane, and processes utilizing such membranes for selectively separating at least one gas from a gaseous mixture by permeation are disclosed.

대표청구항 ▼

An asymmetric gas separation membrane exhibiting substantially improved gas separation selectivity comprising, a preformed asymmetric separation membrane of material having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture w

An asymmetric gas separation membrane exhibiting substantially improved gas separation selectivity comprising, a preformed asymmetric separation membrane of material having selective permeation of at least one gas of a gaseous mixture over that of one or more remaining gases of the gaseous mixture which has been contacted on one or both surfaces with an effective amount of a Br nsted-Lowry acid, wherein with respect to the at least one gas, the acid contacted membrane exhibits a separation factor significantly greater than the separation factor exhibited by the membrane before acid contact. A process for separating at least one gas of a gaseous mixture from at least one other gas and said gaseous mixture by selective permeation and providing a permeated product containing at least one permeating gas comprising: contacting the gaseous mixture with one surface of an asymmetric gas separation membrane exhibiting substantially improved gas separation selectivity, the asymmetric gas separation membrane having been contacted on one or both surfaces with an effective amount of a Br nsted-Lowry acid, wherein with respect to the at least one gas, the acid contacted asymmetric separation membrane exhibits an improved separation factor significantly greater than the separation factor exhibited by the asymmetric membrane before acid treatment; and removing from the vicinity of an opposite surface from the contact surface, a permeated product having a different proportion of said at least one gas of said gaseous mixture to said at least one other gas of said gaseous mixture than the proportion of the gaseous mixture of said at least one gas to said at least one other gas.