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| Number | Title | Issue Date |
| 6708523 | Process and apparatus for producing high-purity nitrogen by low-temperature fractionation of air The invention relates to a process and apparatus for producing nitrogen by low-temperature fractionation of air in a rectification system which has a high-pressure column (4) and a low-pressure column (5). Feed air (1, 3) is introduced into the ... | 03/23/2004 |
| 6560989 | Separation of hydrogen-hydrocarbon gas mixtures using closed-loop gas expander refrigeration A method for the recovery of hydrogen and one or more hydrocarbons having one or more carbon atoms from a feed gas containing hydrogen and the one or more hydrocarbons, which process comprises cooling and partially condensing the feed gas to provide a par... | 05/13/2003 |
| 6543253 | Method for providing refrigeration to a cryogenic rectification plant A method for providing refrigeration to a cryogenic rectification plant which enables the facile provision of varying amounts of refrigeration to the plant wherein a working fluid is pressurized in a recycle compressor, a first portion is at least partial... | 04/08/2003 |
| 6502404 | Cryogenic rectification system using magnetic refrigeration A cryogenic rectification system wherein some or all of the refrigeration necessary to drive the rectification is generated by periodically magnetizing and demagnetizing a bed of magnetizable material, passing refrigerator gas through the bed to produce c... | 01/07/2003 |
| 6324867 | Process and system for liquefying natural gas A natural gas liquefaction system and process wherein excess refrigeration available in a typical natural gas liquefaction system is used to cool the inlet air to gas turbines in the system to thereby improve the overall efficiency of the system. A cooler... | 12/04/2001 |
| 6295837 | Apparatus for air separation The object of the present invention is to separate air at low power cost to produce high-pressure nitrogen gas and oxygen gas by utilizing cold of liquefied natural gas. Feed air is pre-purified and then introduced into a cryogenic separation unit, so tha... | 10/02/2001 |
| 6269658 | Cryogenic rectification system with pulse tube refrigeration A cryogenic rectification system wherein some or all of the refrigeration necessary to drive the rectification is generated by providing a pulse to a gas and then passing the compressed gas to a pulse tube wherein the gas expands in a wave generating refr... | 08/07/2001 |
| 6266977 | Nitrogen refrigerated process for the recovery of C2+ Hydrocarbons C2 and C3 hydrocarbons, particularly ethylene and propylene, are recovered from refinery or petrochemical plant gas mixtures by cooling and fractionating a feed gas mixture containing these hydrocarbons and lighter components. Refrig... | 07/31/2001 |
| 6260380 | Cryogenic air separation process for producing liquid oxygen A cryogenic air separation process for producing liquid oxygen and other liquid products wherein refrigeration generation for the process is decoupled from the flow of process streams and is produced at least in part by at least on multicomponent refriger... | 07/17/2001 |
| 6253577 | Cryogenic air separation process for producing elevated pressure gaseous oxygen A cryogenic air separation process having improved flexibility and operating efficiency for producing elevated pressure gaseous oxygen by vaporizing pressurized liquid oxygen wherein refrigeration generation for the process is decoupled from the flow of p... | 07/03/2001 |
| 6230519 | Cryogenic air separation process for producing gaseous nitrogen and gaseous oxygen A cryogenic air separation process having improved flexibility and operating efficiency wherein refrigeration generation for the process is decoupled from the flow of process streams and is produced by one or more closed loop circuits.... | 05/15/2001 |
| 6196021 | Industrial gas pipeline letdown liquefaction system A high pressure nitrogen pipeline, oxygen or plant air is diverted around a pressure letdown station to liquefy the gas or a portion of the gas for storage or air separation assist, with the remaining unused gaseous portion being returned to the pipeline ... | 03/06/2001 |
| 6158241 | LPG recovery from reformer treat gas LPG and gasoline are recovered from catalytic reformer plant treat gas and net gas by refrigeration-induced condensation and separation, using reformer plant waste heat to produce the refrigeration in an ammonia absorption refrigeration unit. Referring to... | 12/12/2000 |
| 5979181 | Method for the liquefaction of a hydrocarbon-rich gas stream containing aromatic and heavy hydrocarbons Method for the liquefaction of a hydrocarbon-rich gas stream containing aromatic and heavy hydrocarbons, in particular a natural gas stream, where, prior to the liquefaction, a separation of the aromatic and the heavy hydrocarbons, in particular the C | 11/09/1999 |
| 5943881 | Cooling process and installation, in particular for the liquefaction of natural gas A refrigerating mixture is compressed in the penultimate stage of a plurality of stages of a compression unit. The mixture is partially condensed in order to cool it substantially to ambient temperature; the condensed mixture is separated in order to obta... | 08/31/1999 |
| 5916260 | Liquefaction process A natural gas liquefaction process comprises passing natural gas through a series of heat exchangers in countercurrent relationship with a gaseous refrigerant circulated through a work expansion cycle. The work expansion cycle comprises compressing the re... | 06/29/1999 |
| 5826444 | Process and device for liquefying a gaseous mixture such as a natural gas in two steps The process allows to liquefy a gaseous mixture consisting at least partly of a mixture of hydrocarbons, such as a natural gas, by using a cooling mixture that is obtained, after a first cooling step, in a state referred to as "condensed single-phase" sta... | 10/27/1998 |
| 5802874 | Process and apparatus for liquefying low boiling gas such as nitrogen A process and apparatus are used for liquefying a low-boiling gas, 1, 507, particularly nitrogen. Gas to be liquified is cooled 12 under an increased pressure, is expanded 14 and is then obtained as a liquid product 16. In a refrigeration cycle, cycle med... | 09/08/1998 |
| 5768912 | Liquefaction process A process for producing a liquefied natural product such as LNG is described where a single phase nitrogen refrigerant is used in such a way that the refrigerant stream (10) is divided into at least two separate portions (12, 14) which are passed through ... | 06/23/1998 |
| 5755114 | Use of a turboexpander cycle in liquefied natural gas process A process is shown for producing liquefied natural gas from a pressurized natural feed stream. The feed stream is introduced into heat exchange contact with a mechanical refrigeration cycle to cool the feed stream to a first cooling temperature. At least ... | 05/26/1998 |
| 5626034 | Mixed refrigerants in ethylene recovery The present invention is a process of high efficiency rectification zone separation of cracked or other ethylene-containing gas chilled primarily by two closed mixed refrigerant loops and at least part of the dephlegmated overhead gas. The composition of ... | 05/06/1997 |
| 5611218 | Nitrogen generation method and apparatus A method and apparatus for generating nitrogen from the separation of air in a single column nitrogen generator. Nitrogen rich vapor is condensed to form reflux through the vaporization of an oxygen-rich liquid stream produced as column bottoms. The vapor... | 03/18/1997 |
| 5588307 | Process for liquefaction of a pressurized hydrocarbon-rich fraction A pressurized hydrocarbon-rich fraction is cooled and liquefied by heat exchange with the process flows to be heated. Thereafter, the fraction is expanded in an expansion valve and introduced into a storage tank. The flash gas/boil-off gas removed from th... | 12/31/1996 |
| 5566555 | Vapor recovery system with refrigeration and regeneration cycles A vapor recovery system is provided which includes a vapor recovery cycle and a regeneration cycle. The vapor recovery is condensation of the vapors in an air-vapor mixture utilizing a chiller cooled by a refrigerant gas to condense and remove vapor and t... | 10/22/1996 |
| 5551256 | Process for liquefaction of natural gas A pressurized natural gas flow, from which CO2 and H2 O are first removed using an adsorptive separation device, is subjected to liquefaction. The pre-purified natural gas flow is brought into heat exchange with at least one refriger... | 09/03/1996 |
| 5507147 | Method of separating vaporous substances from air saturated with high proportions of components having a low boiling point The invention relates to a method of separating from a gaseous medium vaporous substances having a low boiling point contained in high proportions in the medium, by subjecting said medium to a scrubber where said vaporous substances are precipitated as co... | 04/16/1996 |
| 5481880 | Process and assembly for the compression of a gas Cooling water for compression apparatus (1) is cooled by an air-refrigerated apparatus (18). Makeup water which is cooler than the water treated by this apparatus passes first through a heat exchanger (8) mounted on the delivery conduit of the compression... | 01/09/1996 |
| 5473900 | Method and apparatus for liquefaction of natural gas A process and apparatus for liquefying a natural gas, having a pressure above about 800 psig, in which the natural gas is introduced into an expander which operates to reduce the pressure of the natural gas and extract work from the expansion of the natur... | 12/12/1995 |
| 5450728 | Recovery of volatile organic compounds from gas streams Volatile organic compounds and water vapor are recovered from a low-boiling gas by compressing the gas to an elevated pressure and cooling the gas in stages to condense volatile components and water while avoiding freezing in the system. Operating the sys... | 09/19/1995 |
| 5323616 | Process for cooling a gas in an apparatus for exploiting gases present in the air Compressed air, feeding a unit for the separation of gases present in air, releases calories to a refrigerating unit which operates by absorption while cooling a flow of liquid in heat exchange relationship with a gas of the apparatus to cool the latter s... | 06/28/1994 |
| 5245831 | Single heat pump cycle for increased argon recovery The present invention relates to an improvement for the production of argon from cryogenic air separation processes. In particular, the improvement comprises using a heat pump cycle to transfer refrigeration from the bottom of the low pressure column to t... | 09/21/1993 |
| 5228296 | Cryogenic rectification system with argon heat pump A cryogenic rectification system wherein condensed heat pump fluid is subcooled in the upper portion of an argon column, cools incoming feed, and is compressed and then condensed against cryogenic rectification plant bottoms for reboil thus improving refl... | 07/20/1993 |
| 5220798 | Air separating method using external cold source The invention concerns the separation of air with an external cold source. An internal cold source is provided to supply cold heat to a compressed inert gas by expansion of a part of a liquefied inert gas when the cold from the external cold source proves... | 06/22/1993 |
| 5076822 | Vapor recovery system An integrated vapor recovery system is provided in which the absorption oil used is withdrawn from the tank saturated with the vapors. The absorption oil is then chilled to about 35° to 40 ° F. to produce a lean oil for the absorption column. The absorp... | 12/31/1991 |
| 4911741 | Natural gas liquefaction process using low level high level and absorption refrigeration cycles The present invention is an improvement to a liquefaction process for natural gas, wherein refrigeration for the liquefaction process is provided by two closed-loop refrigeration cycles. The first or low level refrigeration cycle uses either a mixed refri... | 03/27/1990 |
| 4765813 | Hydrogen liquefaction using a dense fluid expander and neon as a precoolant refrigerant The present invention is a process for the liquefaction of hydrogen which utilizes a dense fluid expander and neon as a precoolant refrigerant. In the process, a two phase mixture containing about 85-90% liquid of greater than 95% para-hydrogen is produce... | 08/23/1988 |
| 4655809 | Air separation process with single distillation column with segregated heat pump cycle The present invention is directed to an air separation system for the recovery of pressurized, substantially pure oxygen gas. The system uses a single pressure distillation column and utilizes the nitrogen product stream to provide power for feed air comp... | 04/07/1987 |
| 4615716 | Process for producing ultra high purity oxygen A method of oxygen recycle on the bottom section of the low-pressure column of a dual-pressure column, with an increase in the bottom section reboil vapor rate, allows an appreciable increase in the production rate of ultra high purity oxygen and a substa... | 10/07/1986 |
| 4504296 | Double mixed refrigerant liquefaction process for natural gas A process and system are set forth for precooling, liquefying and subcooling a methane-rich feed stream, such as natural gas, with two closed circuit multicomponent refrigerant cycles in which the first refrigerant comprises a binary mixture of propane an... | 03/12/1985 |
| 4462813 | System and method for converting wellhead gas to liquefied petroleum gases (LPG) A method of converting natural wellhead gas to liquefied petroleum gases (LPG) may comprise the steps of: separating natural gas from petroleum fluids exiting a wellhead; compressing the natural gas; refrigerating the natural gas, liquefying at least a po... | 07/31/1984 |
