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| Number | Title | Issue Date |
| 7429287 | High efficiency gas sweetening system and method Disclosed are a method and system for sweetening a raw natural gas feed stream using a multi-stage membrane separation process, and in embodiments a two-stage membrane separation process. The method and system also include use of a gas turbine which operates with an... | 09/30/2008 |
| 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 |
| 7341618 | Filters and methods of making and using the same Filters for removing particulate and gaseous organic and inorganic materials from a fluid stream are disclosed. The filter may contain a polymer matrix and optional sequestering agents. Methods of making the filters are also disclosed. Methods of using the filters t... | 03/11/2008 |
| 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 |
| 7267761 | Method of reducing sulfur in hydrocarbon feedstock using a membrane separation zone A membrane is used in combination with fractionation and hydrodesulfurization to reduce the sulfur content of hydrocarbon feeds, preferably sulfur-containing naphtha feeds. A membrane separation zone is employed to treat a fraction of effluent from a fractionation z... | 09/11/2007 |
| 7247191 | Crosslinked and crosslinkable hollow fiber membrane and method of making same utility A composition of and a method of making high performance hollow fiber membranes is described. The membranes have a high resistance to plasticization by use of a predetermined amount of crosslinking. The preferred polymer material for the membrane is a polyimide poly... | 07/24/2007 |
| 7219512 | Apparatus for the liquefaction of natural gas and methods relating to same An apparatus and method for producing liquefied natural gas. A liquefaction plant may be coupled to a source of unpurified natural gas, such as a natural gas pipeline at a pressure letdown station. A portion of the gas is drawn off and split into a process stream an... | 05/22/2007 |
| 7144068 | Drive mechanism for selectively opening and closing a closure panel manually or automatically A drive mechanism assembly for enabling driving and manual movement of a sliding side door. The assembly has a track assembly mounted to a vehicle body at a predetermined height and a drive mechanism mounted to the sliding side door so as to be proximate to a door l... | 12/05/2006 |
| 7128150 | Acid gas disposal method This invention is method of recovering gas from a gas-bearing subterranean formation in which gas is produced from an upper portion of the formation and a waste gas is injected into a lower portion of the formation to dispose of the waste gas. The waste gas is injec... | 10/31/2006 |
| 7121115 | Sour natural gas treating method The invention relates to a method for treating a natural gas, saturated or not with water, containing essentially hydrocarbons, a substantial amount of hydrogen sulfide and possibly carbon dioxide. The method of the invention comprises a condensation stage intended ... | 10/17/2006 |
| 7107942 | Fuel composition supply means for spark ignition engines A fuel system for on-board vehicle fuel separation to supply engine fuel compositions formulated as a function of driving cycle conditions. The invention results in improvements in one or more of feed efficiency and combustion emissions. ... | 09/19/2006 |
| 7074256 | Phosphazene membranes for gas separations A polyphosphazene having a glass transition temperature (“Tg”) of approximately −20° C. or less. The polyphosphazene has at least one pendant group attached to a backbone of the polyphosphazene, wherein the pendant group has no halogen atoms. In ad... | 07/11/2006 |
| 7068531 | Bias-adjusted magnetoresistive devices for magnetic random access memory (MRAM) applications A method and apparatus are presented for shifting a hysteresis loop of a magnetoresistive device. For example, a method provides for applying a bias current to a word line of the magnetoresistive device during either a read sequence or a write sequence. The bias cur... | 06/27/2006 |
| 7048846 | Membrane separation for sulfur reduction A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux an... | 05/23/2006 |
| 7040606 | Humidifier A humidifier including an inner case of the shape of a cylinder having a bottom, an outer case of cylindrical shape arranged to be concentric with the inner case, and a plurality of hollow fiber membranes being placed in the space between the two cases and formed in... | 05/09/2006 |
| 7041212 | Membrane separation for sulfur reduction A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux an... | 05/09/2006 |
| 7025803 | Methane recovery process A system and a process for recovering high concentrations of methane from crude natural gas and solid waste landfill exhaust gas uses a sequential combination of a pressure swing adsorber unit operation to remove volatile organic compounds from the crude feed gas mi... | 04/11/2006 |
| 7025804 | Method for separating hydrocarbon-containing gas mixtures using hydrocarbon-resistant membranes A method of separating or concentrating hydrocarbon-containing gas mixtures such as hydrogen from hydrocarbons, carbon dioxide from hydrocarbons, nitrogen from hydrocarbons, and hydrocarbons from one another using a selectively permeable membrane. The method is well... | 04/11/2006 |
| 7025805 | Hydrogen diffusion cell assembly with internal flow restrictor A hydrogen diffusion cell that is used to purify contaminated hydrogen gas. The hydrogen diffusion cell has at least one hydrogen diffusion structure that separates a first area from a second area. Normally, the pressure in the first area is kept higher than the pre... | 04/11/2006 |
| 7018527 | Membrane separation for sulfur reduction A membrane process for the removal of sulfur species from a naphtha feed, in particular, a FCC light cat naphtha, without a substantial loss of olefin yield is disclosed. The process involves contacting a naphtha feed stream with a membrane having sufficient flux an... | 03/28/2006 |
| 6932859 | Crosslinked and crosslinkable hollow fiber membrane and method of making same A composition of and a method of making high performance hollow fiber membranes is described. The membranes have a high resistance to plasticization by use of a predetermined amount of crosslinking. The preferred polymer material for the membrane is a polyimide poly... | 08/23/2005 |
| 6921482 | Skinned hollow fiber membrane and method of manufacture Hollow fiber membranes having a skinned surface on one diameter, and a porous surface on the opposite diameter arm produced from perfluorinated thermoplastic polymers by extruding a heated solution of the polymer having a lower critical solution temperature directly... | 07/26/2005 |
| 6916362 | Ion transport membrane isolation device An isolation device for one or more ion transport membranes and that has a housing and one or more check valves in communication with one or more passageways extending through the housing to prevent gas flow within the housing and the ion transport membrane(s) upon ... | 07/12/2005 |
| 6902676 | Porous hydrophilic membranes Porous hydrophilic membranes comprising a porous inert support on which an ionomer is deposited, said membranes being characterized in that they have a water permeability higher than 1 l/(h.m2.Atm). ... | 06/07/2005 |
| 6860920 | Block polyester-ether gas separation membranes Gas separation membranes formed from polyester-polyether block copolymers which are useful for separating gases from gas mixtures. The membranes and processes are especially suited for separating polar gases from mixtures that contain polar and non-polar species. Th... | 03/01/2005 |
| 6843829 | Block polyurethane-ether and polyurea-ether gas separation membranes Gas separation membranes formed from polyether-urethane or polyether-urea block copolymers are useful for separating gases from gas mixtures. The membranes and processes are especially suited for separating polar gases from mixtures that contain polar and non-polar ... | 01/18/2005 |
| 6752852 | Apparatus for removing moisture from fluids comprising acid gases; methods of using same, and compositions Methods and apparatus for reducing moisture content of fluids comprising moisture and a sulfur-containing compound are disclosed. The methods use an acid gas resistant molecular sieve, and the sulfur-containing compounds are preferably selected from the group consis... | 06/22/2004 |
| 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 |
| 6632266 | High-pressure separation of a multi-component gas The invention relates to a method of separating one or more components from a multi-component gas stream comprising at least one non-acid gas component and at least one acid gas component. A multi-component gas stream at a pressure above 1,200 psia (82.8 ... | 10/14/2003 |
| 6585801 | Operating method of gas engine accommodating to sour gas and the system thereof The operating system of a gas engine accommodating to sour gas comprises a sour gas compressing and feeding part including a compressor 11 and a gas engine 12, a pre-membrane-treatment 13 for obtaining a compressed gas of proper temperature 13a removed of... | 07/01/2003 |
| 6579341 | Nitrogen gas separation using organic-vapor-resistant membranes A process for separating nitrogen from a multicomponent gas mixture containing nitrogen and a hydrocarbon, such as natural gas or associated gas, using gas-separation membranes selective for nitrogen over the hydrocarbon. The membranes use a selective lay... | 06/17/2003 |
| 6572678 | Natural gas separation using nitrogen-selective membranes of modest selectivity A process for treating natural gas or other methane-rich gas to remove excess nitrogen and optionally excess carbon dioxide, water vapor or hydrogen sulfide. The invention relies on gas separation by membranes, using nitrogen/methane selective membranes. ... | 06/03/2003 |
| 6565626 | Natural gas separation using nitrogen-selective membranes A process for treating natural gas or other methane-rich gas to remove excess nitrogen and carbon dioxide simultaneously. The invention relies on membrane separation using nitrogen/methane and carbon dioxide/methane selective membranes. The gas can typica... | 05/20/2003 |
| 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 |
| 6454836 | Method and apparatus for wellbore gas separation A downhole preferential hydrocarbon gas recovery system and method employ preferentially selective materials to separate the hydrocarbon gas from contaminants. According to one aspect of the invention, the preferentially selective materials are arranged i... | 09/24/2002 |
| 6395067 | Geometric separation processes involving modified CTS membranes Porous titanium silicate molecular sieves are produced in the form of a membrane capable of separating fluid molecular mixtures.... | 05/28/2002 |
| 6368382 | Epoxysilicone coated membranes The invention relates to a method of making an epoxysilicone coated membrane by coating a porous asymmetric membrane layer with a UV-curable controlled release epoxysilicone coating. A mixture of the epoxysilicone resin and an onium photocatalyst are appl... | 04/09/2002 |
| 6355092 | Apparatus and method for performing membrane gas/liquid absorption at elevated pressure The invention relates to an apparatus for performing membrane gas/liquid absorption at elevated pressure, comprising a pressure vessel in which a membrane unit is provided for separate feed-through of the gas phase and the liquid phase, in such a way that... | 03/12/2002 |
| 6190621 | Desulfurization apparatus and electric power plant using the same The speed of coal gas desulfurization is improved and the total size of the apparatus can be made compact. The apparatus comprises a sulfide-ion-producing portion (54), which reacts with a sulfur compound being supplied by the coal gas and produces sulfid... | 02/20/2001 |
| 6165253 | Apparatus for removal of volatile organic compounds from gaseous mixtures A vaporizable solute transfer system for transferring a vaporizable solute from a gas feed mixture to an absorbent liquid comprises an absorption module, a porous membrane which divides the absorption module into a gas-feed chamber and an absorbent chambe... | 12/26/2000 |
