Class / Patent application number | Description | Number of patent applications / Date published |
095047000 | Nitrogen or nitrogen containing compound permeates barrier | 32 |
20110072965 | CARBON MEMBRANES FROM CELLULOSE ESTERS - A process for the production of a carbon hollow fibre membrane comprising:
| 03-31-2011 |
20110232484 | ASYMMETRIC GAS SEPARATION MEMBRANE AND PROCESS FOR GAS SEPARATION - There is disclosed an asymmetric gas separation membrane exhibiting both improved gas separation performance and improved mechanical properties, which is made of a soluble aromatic polyimide comprised of a repeating unit represented by general formula (1): | 09-29-2011 |
20120042777 | GAS SEPARATION USING MEMBRANES COMPRISING POLYBENZOXAZOLES PREPARED BY THERMAL REARRANGEMENT - A method of separating components of a gas mixture, the method comprising: passing the gas mixture through a benzoxazole-based polymer membrane at a temperature of from about 30° C. to about 400° C., wherein the benzoxazole-based polymer membrane is represented by the formula: | 02-23-2012 |
20120067208 | METHOD OF MAKING A CROSSLINKED FIBER MEMBRANE FROM A HIGH MOLECULAR WEIGHT, MONOESTERIFIED POLYIMIDE POLYMER - The present disclosure relates to a high molecular weight, monoesterified polyimide polymer. Such high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes for the separation of fluid mixtures. According to its broadest aspect, the method of making a crosslinked membrane comprises the following steps: (a) preparing a polyimide polymer comprising carboxylic acid functional groups from a reaction solution comprising monomers and at least one solvent; (b) treating the polyimide polymer with a diol at esterification conditions in the presence of dehydrating conditions to form a monoesterified polyimide polymer; and (c) subjecting the monoesterified fiber to transesterification conditions to form a crosslinked fiber membrane, wherein the dehydrating conditions at least partially remove water produced during step (b). The crosslinked membranes can be used to separate at least one component from a feed stream including more than one component. | 03-22-2012 |
20120297976 | GAS SEPARATION MEMBRANE AND METHOD FOR PRODUCING THE SAME, AND GAS SEPARATING METHOD, MODULE AND SEPARATION APPARATUS USING THE SAME - Provided is a gas separation membrane having superior gas permeability, separation selectivity and mechanical properties. A gas separation membrane to separate at least one acid gas from a mix gas, comprising in this order: a first layer that is porous; a second layer that is a separation-active layer containing a compound having a molecular weight of 150,000 or less and capable oft interacting with the acid gas; and a third layer having high gas permeability. | 11-29-2012 |
20120304856 | GAS SEPARATION MEMBRANE MODULE AND GAS SEPARATION METHOD - There is provided a process for producing nitrogen-rich air by feeding a high temperature air at 150° C. or more to an air separation membrane module. | 12-06-2012 |
20120312162 | Fluid Separation Assembly and Method - In an embodiment there is provided a fluid separation assembly. The assembly has a hollow fiber bundle with a plurality of hollow fiber membranes. The assembly further has a first tubesheet and a second tubesheet encapsulating respective ends of the hollow fiber bundle, wherein one of the tubesheets has a plurality of radial through openings formed in the tubesheet. The assembly further has a housing surrounding the hollow fiber bundle and the first and second tubesheets, the housing having a feed inlet port, a permeate outlet port, and a non-permeate outlet port. The feed gas, permeate gas, or non-permeate gas are introduced into or removed from the hollow fiber membranes via the plurality of radial through openings formed in the tubesheet, such that the radial through openings of the tubesheet intersect each or substantially each of the hollow fiber membranes. | 12-13-2012 |
20130019748 | ASYMMETRIC HOLLOW FIBER GAS SEPARATION MEMBRANE - The present invention relates to an asymmetric hollow fiber membrane for gas separation made of a soluble aromatic polyimide, wherein an orientation index is 1.3 or less, a separation coefficient α(P′O | 01-24-2013 |
20130042755 | Combination Membrane System For Producing Nitrogen Enriched Air - A system for providing nitrogen enriched air (NEA) from ambient air uses at least two gas separation membranes that are selectively gas permeable for oxygen and nitrogen. The oxygen/nitrogen selectivity and oxygen permeance of two of the membranes are different such that (1) the selectivity of first membrane is less than the second membrane and the oxygen permeance of first membrane is greater than the second membrane, or (2) the selectivity of first membrane is greater than the second membrane and the oxygen permeance of first membrane is less than the second membrane. The system is very compact, is energy efficient, and highly effective for generating NEA. It is ideally suited for mobile, remote and specialized end use applications, such as automotive vehicles, marine vessels, off-shore platform fuel storage and especially for supplying NEA to blanket ullage of onboard aircraft fuel storage tanks. | 02-21-2013 |
20130087042 | WATER-PROOF AIR-PERMEABLE FILTER AND USE OF THE SAME - A water-proof air-permeable filter ( | 04-11-2013 |
20130180399 | METHOD FOR FILTRATION OF HARMFUL GAS EFFLUENTS FROM A NUCLEAR POWER PLANT - A method for filtration of harmful gas effluents from a nuclear power plant including the steps of providing a gas effluent from a nuclear power plant, the effluent including a mixture of gases; filtering the harmful, notably radioactive elements from the gas effluent by membrane separation through at least one membrane, the membrane separation being achieved by sifting, sorption and/or diffusion; storing the filtered harmful elements in storage reservoirs, and discharging the processed gas effluent to the atmosphere. | 07-18-2013 |
20130186269 | MEMBRANE BASED APPARATUS FOR MEASUREMENT OF VOLATILE PARTICLES - A vapor particle separator including a temperature controlled chamber for desorbing vapors from the particulates of an exhaust gas and a separation chamber including a micro porous membrane. The micro porous membrane provides an interface between at least one particle passageway and at least one vapor passageway through the separation chamber. The particle passageway extends from an entrance to the separation chamber to a particle exit from the separation chamber. The vapor passageway extends from the micro-porous membrane to a vapor exit from the separation chamber that is separate from the particle exit from the separation chamber. | 07-25-2013 |
20130192460 | GRAPHENE MEMBRANE WITH REGULAR ANGSTROM-SCALE PORES - Technologies are generally described for perforated graphene monolayers and membranes containing perforated graphene monolayers. An example membrane may include a graphene monolayer having a plurality of discrete pores that may be chemically perforated into the graphene monolayer. The discrete pores may be of substantially uniform pore size. The pore size may be characterized by one or more carbon vacancy defects in the graphene monolayer. The graphene monolayer may have substantially uniform pore sizes throughout. In some examples, the membrane may include a permeable substrate that contacts the graphene monolayer and which may support the graphene monolayer. Such perforated graphene monolayers, and membranes comprising such perforated graphene monolayers may exhibit improved properties compared to conventional polymeric membranes for gas separations, e.g., greater selectivity, greater gas permeation rates, or the like. | 08-01-2013 |
20130192461 | ACCELERATING TRANSPORT THROUGH GRAPHENE MEMBRANES - Technologies are generally described for a membrane that may incorporate a graphene layer perforated by a plurality of nanoscale pores. The membrane may also include a gas sorbent that may be configured to contact a surface of the graphene layer. The gas sorbent may be configured to direct at least one gas adsorbed at the gas sorbent into the nanoscale pores. The nanoscale pores may have a diameter that selectively facilitates passage of a first gas compared to a second gas to separate the first gas from a fluid mixture of the two gases. The gas sorbent may increase the surface concentration of the first gas at the graphene layer. Such membranes may exhibit improved properties compared to conventional graphene and polymeric membranes for gas separations, e.g., greater selectivity, greater gas permeation rates, or the like. | 08-01-2013 |
20140116249 | Aircraft Fuel Tank Flammability Reduction Methods and Systems and Air Separation Methods Using Membranes - An aircraft fuel tank flammability reduction method includes contacting a membrane filter with air feed, permeating oxygen and nitrogen from the air feed through the membrane, and producing filtered air from the filter. The filtered air is produced from the filter as a result of the membrane removing any hydrocarbons containing six or more carbon atoms to produce a total of 0.001 ppm w/w or less. An air separation method includes feeding air into a filter containing a hollow fiber membrane that exhibits the property of resisting degradation due to exposure to hydrocarbons containing six or more carbon atoms. The filter exhibits a pressure drop across the membrane of less than 5 psi. The method includes feeding the filtered air into an air separation module containing a hollow fiber membrane that exhibits a susceptibility to degradation from exposure to hydrocarbons containing six or more carbon atoms. | 05-01-2014 |
20140137734 | CROSS-LINKED POLYIMIDE MEMBRANES FOR SEPARATIONS - The present invention discloses new types of poly(amidoamine) (PAMAM) dendrimer-cross-linked polyimide membranes and methods for making and using these membranes. The membranes are prepared by cross-linking of asymmetric aromatic polyimide membranes using a PAMAM dendrimer as the cross-linking agent. The PAMAM-cross-linked polyimide membranes showed significantly improved selectivities for CO | 05-22-2014 |
20140137735 | POLYIMIDE MEMBRANES AND METHOD OF PRODUCTION - The disclosure relates generally to a gas separation membrane and a gas separation method in which at least one type of gas is separated and recovered from a gas mixture, using the gas separation membrane. The gas separation membrane is asymmetric and hollow and made of a polyimide material. The method of the invention provides a practical, high-performance technique for gas separation. | 05-22-2014 |
20140150646 | BLEND POLYMERIC MEMBRANES CONTAINING FLUORINATED ETHYLENE-PROPYLENE POLYMERS FOR GAS SEPARATIONS - The present invention generally relates to gas separation membranes and, in particular, to high selectivity fluorinated ethylene-propylene polymer-comprising polymeric blend membranes for gas separations. The polymeric blend membrane comprises a fluorinated ethylene-propylene polymer and a second polymer different from the fluorinated ethylene-propylene polymer. The fluorinated ethylene-propylene polymers in the current invention are copolymers comprising 10 to 99 mol % 2,3,3,3-tetrafluoropropene-based structural units and 1 to 90 mol % vinylidene fluoride-based structural units. The second polymer different from the fluorinated ethylene-propylene polymer is selected from a low cost, easily processable glassy polymer. | 06-05-2014 |
20140230649 | Counter-Flow Gas Separation Modules and Methods - A gas separation method includes flowing a gas feed along a feed flow path within a housing directionally from a product end to a feed end of a gas separation membrane. After the feed flow path, the gas feed flows along a membrane flow path defined by the membrane from the feed end to the product end. The feed flow path is counter to the membrane flow path. Heat may be exchanged between the feed flow path and the membrane flow path and increase separation efficiency. Also, heat exchanged may compensate for some temperature drop in the membrane due to enthalpy of gas separation. A gas separation module includes a feed flow path within a housing extending directionally from a product end to a feed end of a membrane. The feed flow path is counter to a membrane flow path defined by the membrane. | 08-21-2014 |
20140290478 | HIGH PERFORMANCE CROSS-LINKED POLYIMIDE ASYMMETRIC FLAT SHEET MEMBRANES - The present invention discloses high performance cross-linked polyimide asymmetric flat sheet membranes and a process of using such membranes. The cross-linked polyimide asymmetric flat sheet membranes have shown CO | 10-02-2014 |
20150027305 | Gas Separation Systems and Methods Using Membranes - A gas separation method includes contacting a membrane filter with gas feed, permeating the gas from the gas feed through the membrane, and producing filtered gas from the filter. The filtered gas is produced from the filter as a result of the membrane removing any hydrocarbons containing six or more carbon atoms to produce a total of 0.001 ppm w/w or less. A gas separation method includes feeding gas into a filter containing a hollow fiber membrane that exhibits the property of resisting degradation due to exposure to hydrocarbons containing six or more carbon atoms. The filter exhibits a pressure drop across the membrane of less than 5 psi. The method includes feeding the filtered gas into a gas separation module that exhibits a susceptibility to degradation from exposure to hydrocarbons containing six or more carbon atoms. | 01-29-2015 |
20150040758 | METHOD AND APPARATUS FOR CRYOGEN-FREE CONCENTRATION OF A HYPERPOLARIZED GAS IN A CONTINUOUSLY FLOWING STREAM OF GAS, AND USE - The present disclosure refers to a method and an apparatus for cryogen-free concentration of a hyperpolarized noble gas in a continuously flowing stream of gas. The method comprises the following steps: providing a mixture of gases containing hyperpolarized noble gas and at least one process gas; passing the prepared gas mixture as a continuously flowing stream of gas through a gas separation device with a semipermeable membrane in order to separate the gases; and concentrating the hyperpolarized noble gas in the gas separation device, in which at least part of the at least one process gas or the hyperpolarized noble gas is separated from the continuously flowing stream of gas by means of the semipermeable membrane. It also provides for the use of a continuous stream of gas with concentrated hyperpolarized noble gas for magnetic resonance spectroscopy or magnetic resonance tomography. | 02-12-2015 |
20150090118 | SELF CROSS-LINKABLE AND SELF CROSS-LINKED AROMATIC POLYIMIDE MEMBRANES FOR SEPARATIONS - This invention relates to self-cross-linkable and self-cross-linked aromatic polyimide polymers, their membranes and methods for making and using these polymers and membranes. The self-cross-linkable aromatic polyimide polymer described in the present invention comprises both hydroxyl functional groups and carboxylic acid functional groups. The self-cross-linked aromatic polyimide was formed via heating the self-cross-linkable aromatic polyimide polymer at ≦300° C. The self-cross-linked aromatic polyimide membranes exhibit high selectivity in separation of mixtures of gases and liquids. | 04-02-2015 |
20150314244 | MEMBRANES FOR GAS SEPARATION SYNTHESIZED FROM POLYIMIDES CONTAINING 2-FLUORO-2',2''-DIAMINOTRIPHENYLMETHANE IN THEIR CHEMICAL STRUCTURE - The present invention relates to the synthesis of linear aromatic polyimides and the production of membranes for the separation of gases. Specifically, polyimides featuring in their chemical structure, in the part derived from a diamine, 4-fluoro-4′,4″-diaminotriphenylmethane, and an aromatic dianhydride derived from tetracarboxylic acid. Polyimides are soluble in amidic solvents such as N,N′-dimethylformamide, N,N′-dimethylacetamide, N-methyl-2-pyrrolidone, etc., which are processed as dense membranes by controlled evaporation of the solvent. The resulting membranes are capable of separating at least a gaseous mixture constituted by two components such as H | 11-05-2015 |
20150336054 | PROCESS AND APPARATUS FOR PRODUCING OXYGEN AND NITROGEN USING ION TRANSPORT MEMBRANES - Process and apparatus for producing an oxygen product gas and a nitrogen product gas using ion transport membrane assemblies. The apparatus comprises at least two ion transport membrane assemblies and a turboexpander downstream of one of the ion transport membrane assemblies. In the process, an oxygen- and nitrogen-containing gas is introduced into a first of the ion transport membrane assemblies to produce oxygen-depleted gas and oxygen product gas. The oxygen-depleted gas is divided, with a first portion being expanded in the turboexpander and a second portion introduced into a second of the ion transport membrane assemblies. A nitrogen-rich product gas and additional oxygen product gas are withdrawn from the second ion transport membrane assembly. | 11-26-2015 |
20160008756 | Separation and Storage of Fluids Using ITQ-55 | 01-14-2016 |
20160045859 | Gas Separation Membranes Based on Fluorinated and Perfluorinated Polymers - A process for separating components of a gas mixture using gas-separation copolymer membranes. These membranes use a selective layer made from copolymers of partially fluorinated or perfluorinated dioxolane monomers and a second monomer, such as dioxane or a partially fluorinated dioxolane. The resulting membranes have superior selectivity performance for gas pairs of interest while maintaining fast gas permeance compared to membranes prepared using conventional perfluoropolymers, such as Teflon® AF, Hyflon® AD, and Cytop®. | 02-18-2016 |
20160083254 | METHOD, DEVICE AND SYSTEM FOR ENRICHMENT OF NF3 GAS - Disclosed is a method for enrichment of NF | 03-24-2016 |
20160102177 | TRIPTYCENE-BASED DIANHYDRIDES, POLYIMIDES, METHODS OF MAKING EACH, AND METHODS OF USE - A triptycene-based monomer, a method of making a triptycene-based monomer, a triptycene-based aromatic polyimide, a method of making a triptycene-based aromatic polyimide, methods of using triptycene-based aromatic polyimides, structures incorporating triptycene-based aromatic polyimides, and methods of gas separation are provided. Embodiments of the triptycene-based monomers and triptycene-based aromatic polyimides have high permeabilities and excellent selectivities. Embodiments of the triptycene-based aromatic polyimides have one or more of the following characteristics: intrinsic microporosity, good thermal stability, and enhanced solubility. In an exemplary embodiment, the triptycene-based aromatic polyimides are microporous and have a high BET surface area. In an exemplary embodiment, the triptycene-based aromatic polyimides can be used to form a gas separation membrane. | 04-14-2016 |
20160136570 | AIR SEPARATION MODULE WITH INCREASED PERMEATE AREA - An air separation module includes a plurality of fibers located within a casing. A fiber membrane defines an exterior of each of the plurality of fibers. The fiber membrane also forms an interior passage along a length of each of the plurality of fibers. The fiber membrane is configured to permeate a gas through the fiber membrane. At least one perforated canister is placed between the plurality of fibers. The at least one perforated canister is configured to collect a permeated gas from the plurality of fibers. | 05-19-2016 |
20160158708 | POLYMER MEMBRANE FOR GAS SEPARATION OR ENRICHMENT COMPRISING HYBRID NANOPOROUS MATERIAL, USES THEREOF, AND A PREPARATION METHOD THEREOF - Disclosed herein is polymer membrane for gas separation or concentration which contains a hybrid nanoporous material, an application thereof, and a manufacturing method thereof. | 06-09-2016 |
20160168325 | TRIPTYCENE-BASED LADDER MONOMERS AND POLYMERS, METHODS OF MAKING EACH, AND METHODS OF USE | 06-16-2016 |