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6206113 |
Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations apparatus
A method for enhancing gas or oil production by delivering a nitrogen rich gas produced from a non-cryogenic source into the well and/or reservoir where the gas and/or oil is located.
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6187077 |
Separation of CF4 and C2F6 from a perfluorocompound mixture
A process for separating at least one of CF 4 and C 2 F 6 from a gas. The process includes the steps of: (a) contacting a gas mixture comprising (i) at least one of CF 4 and C 2 F 6 , (ii)...
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6168649 |
Membrane for separation of xenon from oxygen and nitrogen and method of using same
A gas-separation membrane enables the economical separation of noble gases, especially xenon, from oxygen, nitrogen, carbon dioxide or mixtures of the latter gases. The membrane of the present...
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6152986 |
Method of enriching chlorine gas
A method of enriching chlorine gas is described, which method comprises: (a) providing a supported ceramic membrane having a feed side and a permeate side; (b) bringing a feed gas comprising...
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6132693 |
Process and device for reducing pollutants, especially nitrogen oxides in combustion exhaust gases
A process for reducing pollutants, particularly nitrogen oxides from combustion gases during a combustion process that takes place while oxygen is supplied, includes providing oxygen needed for the...
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6096114 |
Process for recovering SF.sub.6 from a gas
A process for recovering SF 6 from a gas is provided. The process includes the step of contacting a gas stream comprising SF 6 and at least one of N 2 , O 2 , CO 2 , and H 2 O with a membrane in...
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6033475 |
Resist processing apparatus
The present invention has a resist processing apparatus for supplying a processing solution onto an object to be processed to perform a resist process, including a processing solution supply nozzle...
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5976222 |
Recovery of perfluorinated compounds from the exhaust of semiconductor fabs using membrane and adsorption in series
A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane system in combination with...
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5855647 |
Process for recovering SF6 from a gas
A process for recovering SF 6 from a gas is provided. The process includes the step of contacting a gas stream comprising SF 6 and at least one of N 2 , O 2 , CO 2 , and H 2 O with a membrane in...
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5843208 |
Process for recovering sulfur hexafluoride
The present invention provides a process for recovering sulfur hexafluoride ("SF 6 ") from a gas stream using membrane separation.
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5837032 |
Gas separations utilizing glassy polymer membranes at sub-ambient temperatures
This invention relates to a method of an apparatus and method for separating component gases in a gas mixture employing a glassy polymer membrane at temperatures at or slightly above the freezing...
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5820992 |
Silicon containing polyarylates
The present invention provides a process for preparing membranes using novel silicon containing polyarylates of Formula I ##STR1## where R 1 to R 8 represent hydrogen, alkyl groups containing 1...
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5779763 |
Process for recovering semiconductor industry cleaning compounds
A process for separating perfluoro compound gas or vapor from another gas, typically nitrogen, in a gas mixture. The process involves a combination of membrane separation and condensation, and is...
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5759237 |
Process and system for selective abatement of reactive gases and recovery of perfluorocompound gases
Processes and systems to recover at least one perfluorocompound gas from a gas mixture are provided. In one embodiment the inventive process comprises the steps of a) providing a gas mixture...
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5755855 |
Separation process combining condensation, membrane separation and flash evaporation
A process for separating two low-boiling components of a gas-phase mixture. The invention involves three separation steps: condensation, flash evaporation and membrane separation. The steps are...
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5753011 |
Operation of staged adsorbent membranes
A staged adsorbent membrane system is operated to separate a gas mixture wherein more strongly adsorbed secondary components preferentially adsorb and permeate through the adsorbent membrane in the...
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5730779 |
Fluorochemical recovery and recycle using membranes
A method for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane, comprising the steps of:...
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5725769 |
Solvent-resistant microporous polymide membranes
An asymmetric microporous membrane with exceptional solvent resistance and highly desirable permeability is disclosed. The membrane is made by a solution-casting or solution-spinning process from a...
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5700375 |
Particle loaded membranes as oxidant scavengers
An efficient method removes oxidants from fluids (gases and liquids, particularly air) by means of solid phase extraction or reaction. The solid phase extraction or reaction medium comprises a...
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5693230 |
Hollow fiber contactor and process
A hollow fiber contactor and process for fluid treatment having forced circulation with entry of fluid to be treated through the open ended lumen of a porous input hollow fiber having its opposite...
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5670053 |
Purification of gases from water using reverse osmosis
A process for purifying water including removing cations, anions and carbon dioxide and/or ammonia from water feed stream to produce high purity water having a resistivity of greater than 1...
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5656069 |
Selective carbon filter
A filter material from active carbon compacts is prepared by the following steps: (a) mixing active carbon powder with polyvinyl alcohol powder in the ratio of 9:1 to 3:1, (b) mixing the...
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5611842 |
Organic and inorganic vapor permeation by countercurrent condensable sweep
A process for the removal of at least one non-water vapor component of a vaporous mixture, the basic process comprising directing a vaporous mixture against the feed side of a membrane, directing a...
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5582030 |
Apparatus for producing nitrogen
Air is compressed in an air compressor and cooled in an air cooler whereafter the impurities which have condensed out are removed. The air is subsequently reheated in a heat exchanger which is...
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5538536 |
Process and apparatus for separation of a gaseous mixture by successive membranes of different selectivities
Process and apparatus for the separation of at least one gas from an entering gaseous mixture (1), of the type in which a membrane separation is conducted with at least two successive membrane...
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5480682 |
Non-cryogenically generated nitrogen atmosphere for radiation curing
The present invention discloses an improved method of producing a low-cost, nitrogen-based inert atmosphere suitable for radiation curing of resins, coatings, etc. from non-cryogenically generated...
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5455016 |
Membrane-assisted process to produce ammonia
A membrane-assisted process to produce ammonia is set forth wherein the recycle stream from the ammonia process containing primarily unreacted hydrogen and nitrogen but also containing inerts and...
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5439507 |
Membrane gas generator in association with bulk storage for increased flexibility and productivity
A membrane nitrogen generator exhibiting increased flexibility and productivity in response to changes in customer demand which entails a membrane generator capable of generating nitrogen of...
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5395589 |
Apparatus for rapid and specific detection of organic vapors
Apparatus for preconcentrating trace amounts of organic vapors in a sample of air for subsequent detection, comprising a metallic substrate; a thin film of fullerenes deposited on the metallic...
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5342432 |
Composite membrane, process for its production and its use
Composite membrane, process for its production and its use A composite membrane for gas separation having a three-layer structure, constructed from A) a supporting membrane layer made of porous...
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5332424 |
Hydrocarbon fractionation by adsorbent membranes
A method is disclosed for separating a multicomponent gas mixture comprising at least three components into three product streams by use of adsorbent membrane zones operating in series. Each...
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RE34595 |
Process for removing oxygen and nitrogen from crude argon
A process is provided for purifying argon gas, especially an argon gas stream obtained by cryogenically separating air, wherein the argon gas is heated and compressed, and then permeated through a...
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5306331 |
Process for cooling the feed gas to gas separation systems
The present invention provides a process for utilizing one stream from a gas separation unit in an evaporation cooler to provide cool water which is used to cool the feed gas mixture by direct or...
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5286280 |
Composite gas separation membrane having a gutter layer comprising a crosslinked polar phenyl-containing - organopolysiloxane, and method for making the same -
This invention provides a composite gas separation membrane comprising: (a) a porous polyacrylonitrile structural support material having a polyacrylonitrile surface; (b) a gutter layer coating...
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5236474 |
Membrane-based removal of condensable vapors
A process for removing and recovering a condensable vapor from a gas stream by a membrane contactor is disclosed wherein a gas stream containing a condensable vapor is circulated on one side of...
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5234471 |
Polyimide gas separation membranes for carbon dioxide enrichment
Aromatic polyimide membranes have superior flux at low temperature for carbon dioxide and other condensable gases. Superior flux is achieved without reduction in selectivity or other valuable...
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5215554 |
Membranes having enhanced selectivity and method of producing such membranes
Glassy polymeric gas separation membranes are chemically modified throughout the thickness thereof. Such membranes manifest selectivity for a pair of gases which is greater than the intrinsic...
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5211728 |
Clamshell retainer used in hollow fiber membrane devices
The invention relates to a hollow fiber membrane device having a hollow fiber membrane bundle with tubesheets, separable end caps, clamshell-shaped retainers for joining the end caps to the...
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5207806 |
Dual product pressure swing adsorption and membrane operations
The waste gas of PSA-air separation operations is passed to a membrane system for enhanced recovery of a second product. By capturing the portion found to contain a high concentration of either...
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5205842 |
Two stage membrane dryer
This invention uses a first or roughing stage to remove the bulk of moisture and a second or polishing stage to complete the drying. The first stage can use a relatively small membrane area and a...
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5181940 |
Hollow fiber membranes
A process for producing highly asymmetric hollow fibers useful as permselective gas separation membranes and for producing composite membranes thereof by extruding the spinning dope through a...
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5178649 |
Poly(arylene ether ketimine) gas separation membranes
This invention relates to novel poly(arylene ether ketimine) gas separation membranes and a process for separating gases using such membranes.
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5178650 |
Polyimide gas separation membranes and process of using same
Novel aromatic polyimide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides are derived from a...
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5169412 |
Membrane air drying and separation operations
Clean, dry air and nitrogen product gas are produced in an integrated system including an air separation membrane system and a membrane dryer operated with a significant degree of countercurrency...
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5162301 |
Separation of paramagnetic and diamagnetic gases
The invention relates to a new method for the separation of gaseous paramagnetic species from diamagnetic or weakly paramagnetic gaseous species by contacting the mixture of such species with a...
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5160352 |
Method of forming membranes useful for separation of gases
A porous support layer is loaded with blocking liquid, such as an alcohol, prior to contact with an aluminum alkoxide to form thereon a layer of alumina which is dried and calcined to yield a...
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5139540 |
Membrane separation of gases
Mixture of gases such as hydrogen/carbon dioxide may be separated by use of membrane formed by reaction of an aluminium alkoxide with water vapor at high temperatures and pressures.
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5129924 |
Supplemental oxygen ventilator
A method and apparatus for supplying oxygen enriched air to interior space from the atmosphere, consisting of an air pump that is arranged to blow air thru an oxygen concentrator that discharges...
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5127926 |
Membrane process for treating pump exhausts
A process for removing an undesirable vapor from a pump exhaust by a membrane separation process. The process takes advantage of the pressure difference between the inlet and outlet sides of the...
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5104425 |
Gas separation by adsorbent membranes
Composite semipermeable membranes comprising porous adsorptive material supported by a porous substrate are disclosed for use in a process for the separation of multicomponent gas mixtures. In the...
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