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| Number | Title | Issue Date |
| 7390346 | System and apparatus for producing primary standard gas mixtures Provided is a novel system and apparatus for producing primary standard gas mixtures. The system includes providing a gas permeation device having a constant diffusion rate into a temperature controlled enclosure; connecting a supply source of a component to the per... | 06/24/2008 |
| 7318898 | Polymeric membrane wafer assembly and method A method for separating aromatic hydrocarbons from a feed stream. The method includes flowing the feed stream through a first channel within a first wafer assembly that may contain an underflow distribution weir. Next, the feed stream is exposed to a first thin film... | 01/15/2008 |
| 7303681 | Dynamic membrane wafer assembly and method A method for separating aromatic hydrocarbons from a feed stream. The method includes flowing the feed stream through a first channel within a first wafer assembly that may contain an underflow distribution weir. Next, the feed stream is exposed to a first thin film... | 12/04/2007 |
| 7282148 | Porous silicon composite structure as large filtration array A novel asymmetric filter membrane, and process for making is disclosed in several exemplary versions. The membrane structure is physically robust and suitable for use in a wide variety of applications. The support membrane is may be comprised of material such as a ... | 10/16/2007 |
| 7179653 | Measuring method for concentration of halogen and fluorine compound, measuring equipment thereof and manufacturing method of halogen compound The present invention provided a method for measuring a halogen gas and/or a hydrofluorocarbon for the purpose of controlling the concentration of the halogen gas and/or the hydrofluorocarbon, in a plant producing a halogen compound or a perfluorocarbon, at a predet... | 02/20/2007 |
| 7163636 | Multi-phase separation system A multi-phase separation system utilized to remove contaminants from fluids includes a pre-filtering module for filtering a contaminated fluid to provide a filtered contaminated fluid. A condenser module receives the filtered contaminated fluid and a contaminated ga... | 01/16/2007 |
| 7108737 | Method for the purification of corrosive gases The present invention relates to a novel process for the preparation of high-purity chemicals with an extremely low particle count, such as ammonia gas, hydrogen fluoride and hydrogen chloride, which are also used as aqueous solutions in semiconductor technology the... | 09/19/2006 |
| 7070694 | Purification of fluid compounds utilizing a distillation - membrane separation process Apparatus and processes are disclosed for economical separation of fluid mixtures. Broadly, apparatus of the invention is an integrated fractional distillation and perm-selective membrane separation apparatus. More particularly, the integrated apparatus comprises a ... | 07/04/2006 |
| 7014831 | Purification of sulfuryl fluoride Sulfuryl fluoride, which is useful as a fumigant, may be contaminated with sulfur dioxide and possibly other impurities such as sulfuryl chloride, depending on the way it is produced. According to the invention, sulfur dioxide and, if applicable, sulfuryl chloride f... | 03/21/2006 |
| 6793711 | Mixed conducting membrane for carbon dioxide separation and partial oxidation reactions Gas-impermeable membranes containing a molten salt electrolyte in an electron-conducting matrix provide for mixed ion and electron conduction across the membrane. The membranes mediate transport of a selected ion for gas separation and or catalytic reactions at the ... | 09/21/2004 |
| 6706090 | Method for recovering and/or separating sulfur oxyfluorides from gas mixtures A method for the recovery or separation of sulfur oxyfluorides from gas mixtures, in which the gas mixture passes through at least one adsorption stage or membrane stage containing or consisting of zeolites with a modulus >10. The sulfur oxyfluorides fixed to the ad... | 03/16/2004 |
| 6706089 | Disposal unit The invention relates to a method and apparatus for separating toxic compounds from gaseous mixtures, and more particularly to a method and a portable apparatus for the continuous removal of fluorine and compounds thereof from gaseous mixtures. ... | 03/16/2004 |
| 6565821 | Process for removing the fluorocompounds or fluorosulphur compounds from a stream of xenon and/or krypton by permeation A process and a plant for removing the gaseous fluorocompounds or fluorosulphur compounds, such as CF4, C2 F6, and SF6, present in a stream of xenon and/or krypton, by permeation via one or more membranes, such ... | 05/20/2003 |
| 6419725 | Process of forming a permeable gas separation material The process is characterised by sulfonating a partially brominated poly(phenylene oxide). The gas separation material so formed may be made into a membrane and is useful in separating component gases from a gas mixture.... | 07/16/2002 |
| 6406517 | Designed selectivity gas permeable membranes The separation factor with respect to a gas binary of a selectively gas permeable membrane of a fluoropolymer can be increased by fabricating the membrane from a composition of a blend of the fluoropolymer with a nonfugitive, nonpolymeric fluorinated adju... | 06/18/2002 |
| 6187077 | Separation of CF4 and C2F6 from a perfluorocompound mixture A process for separating at least one of CF4 and C2 F6 from a gas. The process includes the steps of: (a) contacting a gas mixture comprising (i) at least one of CF4 and C2 F6, (ii) at least one... | 02/13/2001 |
| 6032484 | Recovery of perfluorinated compounds from the exhaust of semiconductor fabs with recycle of vacuum pump diluent A method for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by first contacting the gas stream with a membrane system in one or more stages where the membrane(s) is selectively more permeable ... | 03/07/2000 |
| 5861049 | Chlorine separation process combining condensation, membrane separation and flash evaporation A process for separating chlorine from other low-boiling components of a gas-phase mixture. The invention involves three separation steps: condensation, flash evaporation and membrane separation. The steps are integrated together in such a way as to provi... | 01/19/1999 |
| 5858066 | Process for separating and recovering fluorocarbons and HCI from gaseous mixtures thereof An improved process is disclosed for separating and recovering a fluorocarbon and hydrogen chloride (HCl) from a gaseous fluorocarbon/HCl mixture, wherein the fluorocarbon and HCl are difficult to separate by conventional means because of the presence or ... | 01/12/1999 |
| 5698011 | Process for separating sterilant gas from diluent gas through a selective membrane A process for separating the components of a gas mixture, including a sterilant gas and a diluent gas is disclosed. The gas mixture is fed to a membrane separation unit within which a perm-selective membrane is located which allows migration of diluent ga... | 12/16/1997 |
| 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 condensable vapor sweep stream past the permeate side of ... | 03/18/1997 |
| 5538535 | Membrane process for treatment of chlorine-containing gas streams A membrane process for separating chlorine from chlorine-containing gas streams is disclosed. The process employs a permselective membrane that is selective to chlorine and is stable in the long-term presence of chlorine. The process can be used to treat ... | 07/23/1996 |
| 5415681 | Process for removing inorganic components from water A process for removing inorganic components from water is disclosed. The process involves gas stripping followed by membrane separation treatment of the stripping gas. The stripping step can be carried out using one or multiple gas strippers and using air... | 05/16/1995 |
| 5374300 | Process for removing condensable components from gas streams A process for treating a gas stream to remove or recover a condensable component. The process involves a condensation step followed by a membrane concentration step. The process is useful in treating raw gas streams containing low concentrations of the co... | 12/20/1994 |
| 5273572 | Process for removing an organic compound from water A process for removing organic compounds from water is disclosed. The process involves gas stripping followed by membrane separation treatment of the stripping gas. The stripping step can be carried out using one or multiple gas strippers and using air or... | 12/28/1993 |
| 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 hollow fiber membranes while cool extraction fluid is circula... | 08/17/1993 |
| 5204003 | Separation processes using expulsion from dilute supercritical solutions A process for separating isotopes as well as other mixtures by utilizing the behavior of dilute repulsive or weakly attractive elements of the mixtures as the critical point of the solvent is approached.... | 04/20/1993 |
| 5199962 | Process for removing condensable components from gas streams A process for treating a gas stream to remove or recover a condensable component. The process involves a condensation step and a membrane concentration step. The condensation step may be followed by the membrane step, or vice versa. The process can be des... | 04/06/1993 |
| 5196616 | Process for separating and recovering fluorocarbons and hydrogen fluoride from mixtures thereof A process for separating and recovering an organic phase (e.g., fluorocarbons such as chlorofluorocarbons, hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons) from a feed stream of a mixture of fluorocarbons and hydrogen fluoride, wherein t... | 03/23/1993 |
| 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 pump to provide the driving force for membrane permeation. T... | 07/07/1992 |
| 5089033 | Process for removing condensable components from gas streams A process for treating a gas stream to remove or recover a condensable component. The process involves a condensation step and a membrane concentration step. The condensation step may be followed by the membrane step, or vice versa. The process can be des... | 02/18/1992 |
| 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 membrane module or set of modules is installed across the ... | 12/10/1991 |
| 5064447 | Process for recovering organic vapors from air A process for separating and recovering organic vapors (e.g., chlorofluorocarbons) from a feed stream of organic vapors and air wherein organic vapors are present in the "window concentration" range being too high for conventional carbon adsorption and to... | 11/12/1991 |
| 4941893 | Gas separation by semi-permeable membranes A method is disclosed for separating gaseous silicon compounds from hydrogen and/or hydracids. Specifically, the method comprises the utilization of semi-permeable membranes for such gaseous separation. Particularly preferred is a composite membrane compr... | 07/17/1990 |
| 4906256 | Membrane process for treatment of fluorinated hydrocarbon-laden gas streams A membrane process for separating fluorinated hydrocarbon vapors is disclosed. The process employs a permselective membrane that is selectively permeable to fluorinated hydrocarbons over oxygen or nitrogen. The process involves contacting the feed side of... | 03/06/1990 |
| 4466202 | Energy-efficient evaporation process with means for vapor recovery A process is disclosed for the recovery and reuse of heat contained in the wet exhaust gases emanating from a solids dryer or liquor concentrator, particularly one in which drying or concentration is facilitated by purging the vapor with some noncondensab... | 08/21/1984 |
| 4444571 | Energy-efficient process for the stripping of gases from liquids A process is disclosed for the recovery and reuse of the heat contained in the gas/vapor overhead mixture from a stripping column in which a noncondensable gas is stripped from a liquid solution by contacting the solution with a hot vapor such as steam. T... | 04/24/1984 |
| 4424067 | Purification of anhydrous hydrogen fluoride The arsenic trifluoride content of anhydrous hydrogen fluoride is reduced by diffusion in one or more stages through a non-porous fluoride-resistant film, such as a thin fluoropolymer film.... | 01/03/1984 |
| 4349356 | Process and apparatus for concentrating a component of a gaseous mixture Disclosed is a process for concentrating a component of a gaseous mixture by the utilization of Knudsen diffusion, the process comprising the steps of feeding the gaseous mixture in the form of a pulse to one surface of a porous membrane and collecting th... | 09/14/1982 |
| 4239507 | Method of separation of a gas from a gas mixture A gas which is the most readily condensable of the gases of a mixture is separated by passing the mixture in contact with at least one microporous barrier having a permeability of 100×10-7 to 1000×10-7 moles of air/cm2 /... | 12/16/1980 |
