Matches 101 - 148 out of 148 < 1 2 3
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5076817 Polyamide gas separation membranes and process of using same  
Polyaramide gas separation membranes and the process of using them are disclosed. The polyaramide gas separation membranes have the formula, ##STR1## where --R-- is ##STR2## --Ar'-- is ##STR3##...
5074891 Method of gas separation and membranes therefor  
An improved method of gas separation and novel polyimide membranes are disclosed and claimed. Membranes in accordance with the present invention include the condensation product of fluorinated...
5071451 Membrane process and apparatus for removing vapors from gas streams  
A membrane process and system for removing condensable vapors from gas streams is disclosed. The process includes a membrane separation step and a condensation or other recovery step. An auxiliary...
5071448 Semipermeable membranes based on certain sulfonated substituted polysulfone polymers  
Semipermeable membranes comprised of certain sulfonated substituted polysulfone polymers containing the polymer repeat unit (A) or (B) as herein defined. The invention also pertains to processes...
5069686 Process for reducing emissions from industrial sterilizers  
A process for treating gas streams containing a sterilant gas and a diluent gas, such as sterilizer exhaust streams. The process involves a sterilant removal step and a diluent removal step. The...
5055116 Gas separation membranes comprising miscible blends of polyimide polymers  
The present invention provides for gas separation membranes which are engineered to have specific gas transport properties based on the blending of certain polymers. In preferred embodiments, the...
5051114 Perfluorodioxole membranes  
A selectively permeable membrane for the separation or enrichment of gaseous mixtures may be formed from amorphous polymers of perfluoro-2,2-dimethyl-1,3-dioxole, especially copolymers with a...
5045093 Gas separating membranes from polyimide polymers and a process for using the same  
The present invention is a class of semi-permeable polyimide membranes and a process for using such membranes to separate one or more components of a gaseous mixture. The membranes are prepared...
5034026 Polybenzazole polymers containing indan moieties  
Polybenzazole polymer containing indan moieties may be synthesized. Those polymers can be fabricated into membranes, which are useful for gas separations.
5030252 Novel benzotrifluoride aryl ether gas separation membranes  
The invention relates to novel benzotrifluoride aryl ether membranes and a process for separating gases using such membranes.
5013437 Hollow fiber membrane fluid separation device adapted for boreside feed which contains multiple concentric stages  
The invention is a hollow fiber membrane fluid separation device specially adapted for boreside feed which contains multiple concentric stages.
5009678 Process for recovery of ammonia from an ammonia-containing gas mixture  
Composite semi-permeable membranes comprised of an extremely thin layer of a sulfonated polysulfone polymer coated on a porous support are useful in processes for the selective permeation of...
4880441 Asymmetric gas separation membranes having graded density skins  
Asymmetric gas separation membranes having graded density skins and macrovoid-free morphology comprised of glassy, hydrophobic polymers are disclosed which are effective for separation gases with...
4880440 Hollow fiber multimembrane cells and permeators  
Two or more different permeable membranes capable of separating different components of a fluid mixture are used to farbicate hollow fiber multicomponent cells and permeator modules.
4871378 Ultrathin ethylcellulose/poly(4-methylpentene-1) permselective membranes  
An ultrathin, permselective membrane for use in gas or vapor separations. The membrane comprises a permselective layer of ethylcellulose in combination with one or more permselective layers of...
4861361 Argon and nitrogen coproduction process  
Argon and nitrogen are separated from a gaseous stream containing them in combination with oxygen in a three-step process comprising introducing the gaseous stream under pressure to a noncryogenic...
4853001 Porous inorganic siliceous-containing gas enriching material and process of manufacture and use  
A hollow, porous, silica-rich fiber and a process for separating at least one gas from a gaseous mixture utilizing the hollow, porous, silica-rich fiber result in gas separations with good...
4842620 Process of gas enrichment with porous siliceous-containing material  
A hollow, porous, silica-rich fiber, a process for producing same, and a process for enriching at least one gas from a gaseous mixture utilizing at least one fiber to result in gas separations with...
4828585 Surface modified gas separation membranes  
A method of using an improved membrane to separate gases is described. The membrane is surface treated by exposing at least one surface of a semipermeable membrane to gaseous fluorine or a...
4793829 Permeation process for separating ammonia from a gas mixture  
A process is provided for separating ammonia from an ammonia synthesis purge gas stream containing ammonia, hydrogen, and contaminant gases. The process involves introducing the gas stream into a...
4762535 Ammonia separation using semipermeable membranes  
The present invention is a process for separating ammonia from mixtures of other gases or from aqueous streams. The ammonia-containing mixture is contacted with a membrane containing, as the active...
4758250 Ammonia separation using ion exchange polymeric membranes and sorbents  
The present invention is a process for separating ammonia from mixtures of other gases or from aqueous streams. The ammonia containing mixture is contacted with an anion exchange polymer cast into...
4741744 Hydrated metal ionomer membranes for gas separation  
The invention relates to a process of separating gases using a membrane fabricated from a polymer containing a perfluorinated backbone and pendant hydrated metal ionomer groups wherein the pendant...
4714481 Gas separation membrane  
A gas separation membrane using, as the material for the membrane, a polymer having the main repeating unit of the formula: ##STR1## and/or formula: ##STR2## (where R represents alkyl group, vinyl...
4699634 Process for the modification of aromatic polymers via phase transfer catalysis to produce polyarylene polymers and the use thereof  
A process for the modification of alkyl halogenated polyarylenes with a derivative compound comprising the steps of forming a mixture of the derivative compound with a phase transfer catalyst,...
4684376 Process for the modification of aromatic polymers via Friedel-Crafts reactions to produce novel polymers and the use thereof  
A process for the addition of pendant groups to polyarylenes comprises the steps of charging a reaction vessel with a solution of a polyarylene and a Friedel-Crafts catalyst; said polyarylene...
4681602 Integrated system for generating inert gas and breathing gas on aircraft  
Improvements in oxygen generators and inert gas generators in aircraft. Separate gas generators are inefficient and thus present the problems of excess weight and heavy space and bleed air...
4666468 Gas separations using membranes comprising perfluorinated polymers with pendant ionomeric moieties  
The invention is a method of separating a gas comprising helium, oxygen, nitrogen or carbon dioxide from a mixture of gases containing helium, oxygen, nitrogen or carbon dioxide wherein the method...
4608060 Separation of polar gases from nonpolar gases  
Polar gases such as hydrogen sulfide, sulfur dioxide and ammonia may be separated from nonpolar gases such as methane, nitrogen, hydrogen or carbon dioxide by passing a mixture of polar and...
4586939 Process for separating gaseous mixtures using a semipermeable membrane constructed from substituted poly(arylene oxide) polymer  
The process for the separation of gases from a mixture is improved by using as the separation vehicle a single layer semipermeable membrane containing at least about 25 weight percent, based upon...
4551156 Permselective membrane compositions for gas separations and process for the separation of gases therewith  
Novel permselective membrane compositions comprise a crosslinked polymer membrane. The polymer membrane has from about 25 to 100 parts by weight of a polyarylene having the formula ##STR1## and...
4521224 Semipermeable membranes prepared from polymers containing pendent sulfone groups  
Semipermeable membranes useful for the separation of gases from a mixture containing at least two fractions into enriched fractions of each, the membrane formed from at least one polymer containing...
4264338 Method for separating gases  
An improved process for the separation of gases by selective membrane diffusion or permeation by means of plural stages of membrane separation without increasing the work required by directing a...
4230463 Multicomponent membranes for gas separations  
Multicomponent membranes for gas separation are disclosed which are effective for separating at least one gas from gaseous mixtures by permeation wherein the multicomponent membranes are comprised...
4180553 Process for hydrogen recovery from ammonia purge gases  
Ammonia synthesis processes are disclosed which provide enhanced conversion of hydrogen values to ammonia. In the processes, a purge stream from an ammonia synthesis loop, which purge stream...
4156597 Ultrathin polyetherimide membrane and gas separation process  
Disclosed is an ultrathin permselective polyetherimide membrane having an average thickness of less than about 10 microns and formed of a polymeric composition comprising a polyetherimide prepared...
4080288 Symbiotic membrane systems  
An improved apparatus and process for use in the treatment of organic and inorganic wastes wherein the reactor has a semipermeable membrane positioned between the gas phase and the liquid phase....
3992153 Dosimeter for oxides of nitrogen  
A dosimeter for the determination of integrated exposures to NO, NO 2 or exposures to both gases. The dosimeter provides for a convenient and accurate method for the determination of exposures...
3818679 SEPARATION OF GASEOUS MIXTURES UNDER NON-STEADY STATE CONDITIONS  
A gas mixture is separated into enriched components under non-steady state conditions wherein a gas in a mixture is more favorably collected by a membrane through adsorption, permeation or both,...
3797200 SEPARATION OF METHANE AND NITROGEN MIXTURES UNDER NON-STEADYSTATE CONDITIONS  
A gas mixture of methane and nitrogen is separated into enriched components under non-steady state conditions wherein nitrogen in the mixture is picked up more favorably by a membrane which is a...
3653180 BLOCK COPOLYMER MEMBRANE FOR SEPARATING POLAR CONTAMINANTS FROM GASEOUS MIXTURES  
Block copolymers containing poly(oxyethylene) segments are used for the preparation of permselective membranes employed in separating polar gases from non-polar gases. Such copolymers containing...
3651618 SEPARATION OF FLUIDS BY DIFFUSION THROUGH SEMIPERMEABLE MEMBRANES  
In a process comprising diffusing a fluid through the upstream side of a semipermeable membrane having upstream and downstream sides, to the downstream side, the improvement comprising exposing the...
3545931 AMMONIA ANALYSIS SYSTEM  
3430417 GAS SAMPLE ENRICHMENT DEVICE  
3307330 Diffusion process and apparatus  
3566580 Title is not available  
3616607 Title is not available  
3614855 Title is not available  
Matches 101 - 148 out of 148 < 1 2 3