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| Number | Title | Issue Date |
| 8409326 | High flux and selectivity SAPO-34 membranes for CO/CHseparations SAPO-34 membranes and methods for their preparation and use are described. The SAPO-34 membranes are prepared by contacting at least one surface of a porous membrane support with a synthesis gel. The Si/Al ratio of the synthesis gel can be from 0.3 to 0.15. SAPO-34 ... | 04/02/2013 |
| 8388733 | Hollow-fiber element for organic-vapor separation A hollow fiber element constituting a separation membrane module for separating an organic vapor is disclosed. At least one end part of a fiber bundle consisting of multiple hollow fiber membranes having a selective permeability is fixed and bound with a tube sheet ... | 03/05/2013 |
| 8002874 | Liquid-phase and vapor-phase dehydration of organic/water solutions Processes for dehydrating an organic/water solution by pervaporation or vapor separation using fluorinated membranes. The processes are particularly useful for treating mixtures containing light organic components, such as ethanol, isopropanol or acetic acid. ... | 08/23/2011 |
| 7951224 | Process for improving the cetane rating of distillate and diesel boiling range fractions The present invention is directed to a process for producing a diesel fuel of enhanced cetane value from low cetane distillate and diesel boiling range fractions from poor crudes such as naphthenic crudes. ... | 05/31/2011 |
| 7842124 | Polymer membrane for separating aromatic and aliphatic compounds This invention relates to a polymeric membrane composition comprising an associating polymer. The polymer coating is characterized as having hard and soft segments where the hard segment comprises TMPA, combined with HDPA. The membrane may utilize a porous substrate... | 11/30/2010 |
| 7815713 | Landfill gas purification method and system The present disclosure provides a method for separating and purifying a landfill gas stream. In one embodiment, the method includes a step of collecting a crude landfill gas stream which includes at least methane, carbon dioxide, oxygen, and nitrogen gases. The meth... | 10/19/2010 |
| 7621979 | Carbon film laminate and method for production thereof, and VOC removing device A carbon film laminate 1 having a porous substrate 6 formed of a plurality of particles and a carbon film 2 provided on a surface of the porous substrate 6, wherein the porous substrate 6 includes a surface layer 3 which is ... | 11/24/2009 |
| 7497896 | Method of treating a gas mixture comprising propane and propylene Methods for treating a gas mixture of at least propylene and propane, in order to separate the propylene from the propane. The gas mixture is brought into contact with a membrane enables the selective permeation of the propylene with respect to the propane. A propyl... | 03/03/2009 |
| 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 |
| 7422623 | Separation membrane by controlled annealing of polyimide polymers This abstract discusses membranes needed to separate fluids for the production of oxygen-enriched air, nitrogen-enriched-air, for the separation of carbon dioxide from hydrocarbons, and the separation of hydrogen from various petrochemical and oil refining streams. ... | 09/09/2008 |
| 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 |
| 7361800 | Process for the separation of olefins from paraffins using membranes Chitosan membranes chelated with silver or cuprous material may be used to separate olefins from a mixture of olefins and paraffins. The feed stream is humidified, demisted, treated to remove sulfur compounds and passed to a cell having a chitosan membrane containin... | 04/22/2008 |
| 7358414 | Para-xylene process using perm-selective separations Processes and apparatus are disclosed for recovery of purified products from a fluid mixture by means of integrated perm-selective separations with purified product recovery operations. More particularly, integrated processes of the invention comprise separations by... | 04/15/2008 |
| 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 |
| 7314503 | Process to remove nitrogen and/or carbon dioxide from methane-containing streams A process for the removal of inert gases, such as nitrogen and carbon dioxide, from methane-containing gases, such as natural gas, including a first stage removal which lowers the total combined inert content to about less than 30% and a second stage removal utilizi... | 01/01/2008 |
| 7314565 | Method and apparatus for separating aromatic hydrocarbons in an isothermal system An isothermal method is provided 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 contains a rib member. Next, the feed stream is exposed to a first thin f... | 01/01/2008 |
| 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 |
| 7268094 | Mixed matrix membrane with super water washed silica containing molecular sieves and methods for making and using the same The present invention provides a method for preparing silica containing molecular sieves which may be mixed with an organic polymer to create a mixed matrix membrane. Further, this invention includes a method of making such a mixed matrix membrane and the membrane i... | 09/11/2007 |
| 7267775 | Gas processing method using a filtered glycol solution The invention relates to a method and to a plant for processing a gas by means of a glycol solution wherein a feed comprising a gas, a glycol, water and salts is subjected to a first stage (5) of separating the gas from a liquid effluent and said liquid efflu... | 09/11/2007 |
| 7255792 | Method for modifying an organic composition There is provided a process for modifying a first organic composition comprising (i) at least one first solvent, (ii) at least one solute, and (iii) optionally, at least one second solvent to produce a modified organic composition in which the concentration of the a... | 08/14/2007 |
| 7255725 | Porous inorganic membrane containing carbon; a process for its preparation; and use thereof A porous inorganic membrane comprises at least one inorganic phase having separating properties. Said membrane has a carbon content representing 0.05% to 25% by weight with respect to the mass of said inorganic phase and is selective to non-condensable gases. It is ... | 08/14/2007 |
| 7252702 | Hydrogen purification optimization system A method of hydrogen recovery in refineries and petrochemical operations in which some or all of the feed streams for separate PSA units are combined and utilized as feed for a single PSA unit, and in which some or all of steam reformer product and refinery offgas s... | 08/07/2007 |
| 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 |
| 7179321 | Facilitated transport membranes comprising a porous support and a solid polymer electrolyte consisting of a transition metal salt and a polymer having phthalic structure The present invention relates to a facilitated transport membrane for separation of alkene hydrocarbons from hydrocarbon mixtures, comprising a porous support and a solid polymer electrolyte consisting of a transition metal salt and a polymer having phthalic structu... | 02/20/2007 |
| 7166146 | Mixed matrix membranes with small pore molecular sieves and methods for making and using the membranes A mixed matrix membrane is provided which comprises a continuous phase organic polymer and small pore molecular sieves dispersed therein. The molecular sieves have a largest minor crystallographic free diameter of 3.6 Angstroms or less. When these molecular sieves a... | 01/23/2007 |
| 7160927 | Sulfonated aryl sulfonate matrices and method of production Porous matrices and membrane matrices comprising sulfonated aryl sulfonate polymers are prepared from a sulfonated aryl sulfonate polymer solution which is made by dissolving an aryl sulfonate polymer, and optionally a polymer other than aryl sulfonate, in a sulfona... | 01/09/2007 |
| 7160356 | Dithiolene functionalized polymer membrane for olefin/paraffin separation A polymeric composite may be used for forming fluid separation membranes. The membranes may be formed from polyimide, polyamide or poly (pyrrolone-imide) materials. Polyamides may be formed by the condensation of a tetraamine, a tetraacid, and a diamine. Polyimides ... | 01/09/2007 |
| 7138006 | Mixed matrix membranes with low silica-to-alumina ratio molecular sieves and methods for making and using the membranes A mixed matrix membrane is provided which comprises a continuous phase organic polymer and small pore alumina containing molecular sieves dispersed therein. The molecular sieves have a silica-to-alumina molar ratio of less than 1.0, more preferably, less than 0.3, a... | 11/21/2006 |
| 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 |
| 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 |
| 7109140 | Mixed matrix membranes Mixed matrix membranes are prepared from zeolites and polymers, such as polyimides, in a void free fashion where either no voids or voids of less than several Angstroms are present at the interface of the polymer and the zeolite by bonding (hydrogen, ionic, or coval... | 09/19/2006 |
| 7094372 | Chitosan membrane containing nano-inorganic particles and the method for forming the same A chitosan membrane containing nanosize particles is disclosed in this invention. The chitosan membrane comprises a chitosan membrane and nano-inorganic particles. The nano-inorganic particles are uniformly embedded in the chitosan membrane. This invention also disc... | 08/22/2006 |
| 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 |
| 7029515 | Method of optimally operating a palladium-copper alloy membrane in the generation of pure hydrogen from a fossil fuel reformate at a controlled high temperature An optimized method of operating a palladium-copper alloy membrane in the generation of pure hydrogen from a fossil fuel reformate and the like in a controlled high temperature range of from about 470° C. to 600° C., achieving substantially constant hydrogen perme... | 04/18/2006 |
| 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 |
| 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 |
| 7022165 | Tubular hydrogen permeable metal foil membrane and method of fabrication A tubular hydrogen permeable metal membrane and fabrication process comprises obtaining a metal alloy foil having two surfaces, coating the surfaces with a metal or metal alloy catalytic layer to produce a hydrogen permeable metal membrane, sizing the membrane into ... | 04/04/2006 |
| 7018445 | Polyimide blends for gas separation membranes The present invention provides a selectively gas permeable membrane that has a superior combination of permeability and selectivity. The membrane composition includes a Type 1 copolyimide uniformly blended with a Type 2 copolyimide, which polymers are defined by che... | 03/28/2006 |
| 7013673 | Hydrate-based desalination/purification using permeable support member Processes and apparatus are disclosed for separating and purifying aqueous solutions such as seawater by causing a substantially impermeable mat of gas hydrate to form on a porous restraint. Once the mat of gas hydrate has formed on the porous restraint, the portion... | 03/21/2006 |
| 6997971 | Cross-linked polybenzimidazole membrane for gas separation A cross-linked, supported polybenzimidazole membrane for gas separation is prepared by reacting polybenzimidazole (PBI) with the sulfone-containing crosslinking agent 3,4-dichloro-tetrahydro-thiophene-1,1-dioxide. The cross-linked reaction product exhibits enhanced ... | 02/14/2006 |
