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| Number | Title | Issue Date |
| 7458232 | Method and installation for producing treated natural gas, a C3+ hydrocarbon cut and an ethane rich stream This method comprises the cooling of the initial natural gas and its introduction into a column for recovering C2+ hydrocarbons. It comprises the recovery of the top stream from the column to form the treated natural gas, and the recovery of th... | 12/02/2008 |
| 7371363 | Methods of purifying hydrogen fluoride Provided are methods of producing anhydrous hydrogen fluoride comprising: providing a mixture comprising hydrogen fluoride and at least one halogenated hydrocarbon; and extracting hydrogen fluoride from the mixture by contacting the mixture with a solution of less t... | 05/13/2008 |
| 7310971 | LNG system employing optimized heat exchangers to provide liquid reflux stream An improved apparatus and method for providing reflux to a refluxed heavies removal column of a LNG facility. The apparatus comprises stacked vertical core-in-kettle heat exchangers and an economizer disposed between the heat exchangers. The reflux stream originates... | 12/25/2007 |
| 7273835 | Azeotrope-like compositions of difluoromethane The invention relates to azeotropic and azeotrope-like mixtures of HFC-32 and HCl or a mixture of HCl and Cl2, and a process for separating the azeotrope-like mixtures. ... | 09/25/2007 |
| 7265082 | Azeotrope-like compositions of 1,1,1,3,3-pentachloropropane and carbon tetrachloride The invention relates to azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentachloropropane (HCC-240fa) and carbon tetrachloride and a process for separating the azeotrope-like mixtures. The compositions of the invention are useful as an intermediate in the prod... | 09/04/2007 |
| 7249469 | Method for separating a multicomponent stream This invention relates to a method for separating a stream having benzene, toluene and alkyl benzene, said method comprising: feeding the stream into a first distillation column, wherein the stream comprises between about 60 mole percent to about 85 mole percent tol... | 07/31/2007 |
| 7152428 | Refrigeration system A refrigeration process is disclosed that employs a mixed refrigerant to chill a process gas stream in which a second stream is cooled against rewarming vaporized mixed refrigerant at low pressure and subsequently is at least partially vaporized against at least par... | 12/26/2006 |
| 7036337 | Recovery of hydrogen from refinery and petrochemical light ends streams A process for recovering hydrogen from a stream comprised of hydrogen, non-condensable gases, and propane and lighter hydrocarbons, wherein the process comprises the steps of stripping hydrogen and non condensable gases out of the feed light ends stream with methane... | 05/02/2006 |
| 6912872 | Method and apparatus for producing a purified liquid The present invention provides generally a method and apparatus for purifying a liquid. More particularly, purification of a bulk liquid is performed by introducing a liquid stream to a purification vessel, which comprises both a distillation chamber for forming a p... | 07/05/2005 |
| 6907752 | Cryogenic liquid natural gas recovery process A process for the recovery of natural gas liquids (NGL) (ethane, ethylene, propane, propylene and heavier hydrocarbons) from liquefied natural gas (LNG) is disclosed. The LNG feed stream is split with at least one portion used as an external reflux, without prior tr... | 06/21/2005 |
| 6837071 | Nitrogen rejection method and apparatus Nitrogen is rejected from a feed gas stream comprising methane and nitrogen so as to form a methane product. The feed gas is separated in a double rectification column comprising a higher pressure rectification column 14, a lower pressure rectification column 16, an... | 01/04/2005 |
| 6758060 | Separating nitrogen from methane in the production of LNG Substantially all the nitrogen is removed from natural gas during the production of LNG, without producing mixed nitrogen/methane streams needing recycle and further processing, or requiring compression for burning as fuel, by operating both the high pressure and th... | 07/06/2004 |
| 6755965 | Ethane extraction process for a hydrocarbon gas stream A process for ethane extraction from a gas stream based on turboexpansion and fractionation with no mechanical refrigeration is provided. The feed gas is sweetened and dehydrated by a conventional amine process and by a molecular sieve unit, to remove carbon dioxide... | 06/29/2004 |
| 6601406 | Methods and apparatus for high propane recovery Methods and configurations for improved propane recovery plant employ an absorber column, and a deethanizer column with an overhead condenser that produces a reflux condensate. The reflux condensate is recycled to both the absorber column and the deethani... | 08/05/2003 |
| 6581410 | Low temperature separation of hydrocarbon gas The invention provides a process for the separation of a heavier hydrocarbon fraction from a gaseous feed comprising a mixture of hydrocarbons, which process comprises subjecting the feed to a first fractionation to form a condensed product; subjecting th... | 06/24/2003 |
| 6516631 | Hydrocarbon gas processing A cryogenic natural gas liquids recovery process which includes the use of a demethanizer and a deethanizer includes a step of recycling a portion of the deethanizer overhead to the demethanizer.... | 02/11/2003 |
| 6405561 | Gas separation process A process for separating a feed gas stream containing methane, C2 components, C3 components, and heavier components into a volatile gas stream containing a major portion of the methane and C2 components and a less volatile... | 06/18/2002 |
| 6347533 | Hydraulically balanced fully thermally coupled system A fully thermally coupled distillation structure designed to overcome hydraulic limitations in the past has been revealed for separating a multi-component feed stream into three product streams. The fractionation apparatus is equipped with at least one co... | 02/19/2002 |
| 6286335 | Processes for multicomponent separation An efficient and easier to operate distillation process separates mixtures containing three of more components into streams enriched in one of the components. The invention converts a two-way communication between two distillation columns of a prior art t... | 09/11/2001 |
| 6269657 | Process and apparatus for separating mixtures of hydrogen and carbon monoxide Hydrogen and carbon monoxide are separated from a condensate-containing gaseous mixture thereof by using (a) a "first" stripping column (8) to remove the hydrogen content of the CO-loaded methane stream (6) obtained by washing CO from the gaseous mixture,... | 08/07/2001 |
| 6125653 | LNG with ethane enrichment and reinjection gas as refrigerant The present invention comprises a process for producing liquefied natural gas from the methane that is produced during natural gas liquids extraction. The process includes distilling the feed to extract methane, then cooling and expanding the methane to p... | 10/03/2000 |
| 6116050 | Propane recovery methods The present invention is directed to methods for separating and recovering propane, propylene and heavier hydrocarbons, i.e., the C3 + hydrocarbons, from a gas feed, e.g., raw natural gas or a refinery or petroleum plant gas stream. These metho... | 09/12/2000 |
| 6106674 | Operable and efficient distillation schemes for multicomponent separations The present invention teaches an efficient and easier to operate distillation system to separate mixtures containing three or more components into streams enriched in one of the components. In this invention, a liquid stream enriched in the least volatile... | 08/22/2000 |
| 6082134 | Process and apparatus for separating a gaseous mixture Hydrogen (4), and carbon monoxide (21) are separated from a gaseous mixture thereof, typically a mixture of essentially hydrogen, carbon monoxide and methane (1) using liquid methane (3) to dissolve carbon monoxide in a methane wash column (2), removing (... | 07/04/2000 |
| 5956971 | Process for liquefying a natural gas stream containing at least one freezable component This invention relates to a process for producing pressurized liquid rich in methane from a multi-component feed stream containing methane and a freezable component having a relative volatility less than that of methane. The multi-component feed stream is... | 09/28/1999 |
| 5918481 | Process for separating hydrogen fluoride from fluorocarbons The invention provides a method for separating fluorocarbons from mixtures of fluorocarbon and hydrogen fluoride. In particular, the invention provides a method for separating fluorocarbons, such as pentafluoropropane, from azeotropic mixtures of the fluo... | 07/06/1999 |
| 5806339 | Multiple effect and distributive separation of isobutane and normal butane The present invention is an enhancement of the prior art use of partial effects and component distribution regarding NGL fractionation, especially relating to the separation of propane, isobutane, normal butane and gasoline components. The present inventi... | 09/15/1998 |
| 5791161 | Low pressure deethanizer The present invention is a set of improvements in deethanizing and depropanizing fractionation steps in NGL processing. The several embodiments of the present invention apply component distribution to multiple columns, interreboiling, intercondensing, the... | 08/11/1998 |
| 5779863 | Perfluorocompound separation and purification method and system Provided is a novel method and system for separating and purifying perfluorocompounds (PFCs). The method comprises the steps of: (a) introducing a perfluorocompound-containing gas stream into a first distillation column; (b) removing a light product from ... | 07/14/1998 |
| 5685171 | Method of separating organic vapors from gaseous media A method of separating from gaseous media, such as air or technical gases, organic vapors by substantially isothermally raising the pressure of the media and subjecting them to cooling in a cold scrubber receiving its operating low temperature from circul... | 11/11/1997 |
| 5673571 | Deethanizer/depropanizer sequences with thermal and thermo-mechanical coupling and component distribution The present invention is a set of improvements in deethanizing and depropanizing fractionation steps in NGL processing. The several embodiments of the present invention apply component distribution to multiple columns, interreboiling, intercondensing, the... | 10/07/1997 |
| 5452581 | Olefin recovery method A method is described for recovering olefins by condensation from the reaction effluent stream from a cracking furnace containing olefins and hydrogen wherein a membrane separator is employed to reject the hydrogen from the reaction effluent stream. In su... | 09/26/1995 |
| 5421167 | Enhanced olefin recovery method An enhanced method is disclosed for recovering olefins from a cracking furnace effluent stream in an olefins plant. In accordance with this method, a liquid hydrocarbon stream, preferably obtained from the compressor area drier liquids and/or from the dee... | 06/06/1995 |
| 5321952 | Process for the purification of gases A process is disclosed for the purification of natural gas in which the reduction of the nitrogen content of a natural gas stream is achieved by a combination of absorption, purification, flashing, and reflux steps. More specifically, the process achieves... | 06/21/1994 |
| 5253479 | Method and apparatus for recovery of ethylene and propylene from gas produced by the pyrolysis of hydrocarbons A method and an apparatus for the largest recovery of ethylene and propylene from gas produced by the pyrolysis of hydrocarbons, wherein any liquid current produced by the fractional condensation of the raw gas up to a definite temperature is directly fed... | 10/19/1993 |
| 5152148 | Propane removal process In a process for removing propane from a mixed liquid hydrocarbon stream, the depropanizer bottoms from a depropanizer are utilized to reflux the de-ethanizer. The process includes flowing the mixed liquid hydrocarbon stream through a de-ethanizer for sep... | 10/06/1992 |
| 5090977 | Sequence for separating propylene from cracked gases A process sequence for treating cracked gases of heavy feedstocks which preferentially produces propylene to the exclusion of propane, butanes and butenes. The process eliminates the need for a depropanizer with the attendant savings in capital and operat... | 02/25/1992 |
| 4976849 | Fractionation process for gaseous hydrocarbon mixtures with a high acid gas content A fractionation process for gaseous hydrocarbon mixtures of high acid gas content is described, for separating at least a fraction containing ethane, propane and heavier hydrocarbons, a fraction containing essentially acid gases and a fraction containing ... | 12/11/1990 |
| 4888035 | Process and apparatus for separation of a gaseous mixture The disclosure relates to a process as well as an apparatus for the separation of a gaseous mixture containing essentially hydrogen, methane and carbon monoxide, wherein the gaseous mixture is subjected to a physical low-temperature scrubbing step with li... | 12/19/1989 |
| 4759786 | Separation of gaseous mixtures An incoming stream of gas mixture typically comprising methane and up to 12% by volume of carbon dioxide is subjected to rectification in a first column to form a carbon dioxide depleted fraction that is withdrawn as product from the top of the column and... | 07/26/1988 |
