Monsanto Company

Anthony Zampini

Raymond F Malon

Jay M Henis

Albert A Brooks

Daniel Raucher

Joel R Fried

Asymmetric polymeric gas separation membranes have ammonium salts bonded to the polymer to provide a membrane with enhanced separation factor.

Polymeric membranes with ammonium salts

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 Bronsted-Lowry base. 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.

Asymmetric gas separation membranes

A coated membrane for gas separations wherein the membrane is made up of an amine cross-linked poly(phenylene oxide) substrate membrane having about 1 to about 7 weight percent nitrogen and a coating on the substrate membrane. The coating is a polymer containing groups capable of reacting with amine groups at the surface of the substrate membrane to ionically or covalently bond the coating to the substrate.

Polyphenylene oxide membrane having chemically bonded coating

A gas separation membrane made from a benzyl-substituted polymer of 2,6-dimethyl-1,3-phenylene oxide having the structure ##STR1## wherein the benzyl substituent, X, is selected from the group consisting of ##STR2## where R.sub.1 and R.sub.2 are hydrogen, an alkyl, phenyl or a substituted phenyl or substituted alkyl of 1-6 carbon atoms where the substituent is phenyl, a nitro group, an alkoxy a phenoxy group, sulfide, sulfoxide, a carboxylic acid group or an alcohol, m is 0-0.99, n is 0-0.99 and o is 0.01-99, with m, n and o being decimal portions of a polymeric unit and the sum of m, n and o being 1, p is 1 and q is 0 or 1. Expressed in percentages of a polymeric unit, m is 0-99 percent, n is 0-99 percent and o is 1 to 99 percent. Preferably, m and n are at least 0.01.

Benzyl substituted phenylene oxide membrane

Asymmetric gas separation membranes of polymeric 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 improved permeation selectivities for the at least one gas when the asymmetric membranes have been contacted on one or both surfaces with an effective amount of a permeation modifier. The permeation modified asymmetric gas separation membrane having an effective amount of permeation modifier added in a non-homogeneous mode and without loss of Tg.

Permeation modified gas separation membranes

Covalently-bonded, cross-linked polymeric gas separation membranes of a polyarylene oxide precursor and a chemical cross-linking agent. Apparatus and processes utilizing such membranes for selectively separating at least one gas from a gaseous mixture by permeation. Membranes include substituted phenylene oxide polymers cross-linked with ammonia.

Cross-linked polyarylene oxide membranes

Asymmetric polymeric gas separation membranes comprise amorphous aryl substituted arylene oxide polymer. Such amorphous polymer is capable of forming hollow fiber membranes by wet spinning procedures utilizing coagulation baths and bore injection fluids comprising water. Desirable aryl substituents include halogens, nitro, lower alkyls and lower acyls.

Amorphous aryl substituted polyarylene oxide membranes

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 Lewis 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.

A multicomponent membrane having improved permeation characteristics for separation of one gas from a mixture of gases by permeation of the one gas through the membrane. The membrane is in the form of a porous, anisotropic substrate membrane and a coating in contact with the substrate membrane, the coating being made of poly(dimethyl siloxane), containing 1 to 20 weight percent of a permeation-modifying radical selected from the group consisting of ##STR1## The coating is applied to the substrate in the form of a solution of 0.05 to 1 weight percent of the coating in a suitable solvent such as pentane.

Permeation modified membrane

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.

Cross-linked polyphenylene oxide compositions comprise the reaction product of haloacylated polyphenylene oxide and a primary monoamine. The polyphenylene oxide chains are cross-linked by amino ketone bonding. Such cross-linked polymers are useful as membranes, for instance gas separation membranes.

Amino ketone cross-linked polyphenylene oxide

Cross-linked polyphenylene oxide compositions comprise the reaction product of haloacylated polyphenylene oxide and ammonia. The polyphenylene oxide chains are cross-linked by amino ketone bonding. Such cross-linked polymers are useful as membranes, for instance gas separation membranes.

Cross-linked polyphenylene oxide compositions comprise the reaction product of an alkyl halogenated phenylene oxide polymer and ammonia. The cross-linkage between phenylene groups is benzyl amine linkage represented by the structural formula --CH.sub.2 NHCH.sub.2 --. The cross-linked polyphenylene oxide is useful as a membrane.

Cross-linked polyphenylene oxide

Cross-linked polyphenylene oxides comprise the reaction product of alkyl halogenated phenylene oxide polymer and primary monoamines, such as methylamine, ethylamine, propylamine, butylamine and aniline. Such cross-linked polyphenylene oxide compositions are useful as membranes.

Tube sheets having a plurality of hollow fiber membranes suitable for fluid separations which are adapted to be provided in a fluid tight relationship within a permeator comprise a cured epoxy resin comprising polyglycidyl resin and imidazole curing agent. Methods are provided for making tube sheets.

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St. Louis, MO, United States of America

Anthony Zampini