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| Number | Title | Issue Date |
| 7866184 | Semi-closed loop LNG process A semi-closed loop system for producing liquefied natural gas (LNG) that combines certain advantages of closed-loop systems with certain advantages of open-loop systems to provide a more efficient and effective hybrid system. In the semi-closed loop system, the fina... | 01/11/2011 |
| 7707852 | Process for recovering lower carbon olefins from product gas for production of olefins The present invention concerns a process for recovering lower carbon olefins from MTO or DTO product gas. Said process primarily comprises the product gas compressing, pre-deethanizing, demethanizing and ethylene recovering apparatus, depropanizing column, ethylene ... | 05/04/2010 |
| 7377127 | Configuration and process for NGL recovery using a subcooled absorption reflux process An NGL recovery plant includes a demethanizer (7) in which internally generated and subcooled lean oil absorbs CO2 and C2 from a gas stream (11), thereby preventing build-up and freezing problems associated with CO2, es... | 05/27/2008 |
| RE40124 | Process and installation for recovery and purification of ethylene produced by pyrolysis of hydrocarbons, and gases obtained by this process A process for the high-yield recovery of ethylene and heavier hydrocarbons from the gas produced by pyrolysis of hydrocarbons in which the liquid products resulting from the fractionated condensation of a cracking gas for the recovery of almost all the ethylene, are... | 03/04/2008 |
| 7316127 | Hydrocarbon gas processing for rich gas streams A process for the recovery of ethane and heavier hydrocarbon components from a hydrocarbon feed gas stream. Feed gas stream is cooled into a first and second cooled streams. First and second cooled streams are sent to a cold absorber and separated into a first gas s... | 01/08/2008 |
| 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 |
| 7302812 | Process for production of isotopes A process for producing an isotopically enriched compound of a desired isotope includes (a) providing a cryogenic reaction zone containing a catalyst adapted to catalyze an isotope exchange reaction at a cryogenic reaction temperature, (b) feeding to the cryogenic r... | 12/04/2007 |
| 7299643 | Method for recovering LPG boil off gas using LNG as a heat transfer medium A process for condensing a C3-C4 hydrocarbon vapor which comprises contacting the C3-C4 hydrocarbon vapor with a heat exchanger surface which is cooled by contact with LNG and recovering a liquefied C3-C4 | 11/27/2007 |
| 7278281 | Method and apparatus for reducing C2 and C3 at LNG receiving terminals A liquefied natural gas (LNG) receiving terminal is provided, including an extraction column adapted and configured to separate a C1 component from other components in a LNG stream into a C1 rich stream, one of a gas condenser and a heat exchan... | 10/09/2007 |
| 7273542 | Process and apparatus for recovering olefins The present invention relates to a process and apparatus for recovering product from reactor effluent of a reactor for a hydrocarbon feedstream. An indigenous C4 stream is used as lean oil in a demethanizer, which facilitates significant cost and operatio... | 09/25/2007 |
| 7257966 | Internal refrigeration for enhanced NGL recovery The present invention is directed to methods for improving the efficiency of processes for the recovery of natural gas liquids from a gas feed, e.g., raw natural gas or a refinery or petrochemical plant gas stream. These methods may be employed with most, if not all... | 08/21/2007 |
| 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 |
| 7237407 | Process and plant for the simultaneous production of an liquefiable natural gas and a cut of natural gas liquids This process includes the following steps: (a) the feed natural gas (101) is introduced into a first distillation column (31) which produces, as top product, a pretreated natural gas (111), which pretreated nat... | 07/03/2007 |
| 7234323 | Recovering natural gas liquids from LNG using vacuum distillation A process for recovering liquefied C3 compounds from a natural gas stream containing C3 compounds which comprises (a) chilling the natural gas stream under conditions sufficient to liquefy the natural gas, whereby a mixture comprising liquid na... | 06/26/2007 |
| 7216507 | Liquefied natural gas processing A process and apparatus for the recovery of ethane, ethylene, propane, propylene, and heavier hydrocarbons from a liquefied natural gas (LNG) stream is disclosed. The LNG feed stream is divided into two portions. The first portion is supplied to a fractionation colu... | 05/15/2007 |
| 7210311 | Natural gas liquefaction A process for liquefying natural gas in conjunction with producing a liquid stream containing predominantly hydrocarbons heavier than methane is disclosed. In the process, the natural gas stream to be liquefied is partially cooled, expanded to an intermediate pressu... | 05/01/2007 |
| 7207192 | Secondary deethanizer to debottleneck an ethylene plant A process for deethanizing light hydrocarbons comprising olefins is disclosed. A feed stream, comprising ethylene, ethane, propylene, and propane, is supplied to a primary deethanizer 24, having absorption and stripping sections. The absorption section produc... | 04/24/2007 |
| 7204100 | Natural gas liquefaction A process for liquefying natural gas in conjunction with producing a liquid stream containing predominantly hydrocarbons heavier than methane is disclosed. In the process, the natural gas stream to be liquefied is partially cooled and divided into first and second s... | 04/17/2007 |
| 7191617 | Hydrocarbon gas processing A process for the recovery of ethane, ethylene, propane, propylene, and heavier hydrocarbon components from a hydrocarbon gas stream is disclosed. The stream is cooled and divided into first and second streams. The first stream is further cooled to condense substant... | 03/20/2007 |
| 7185514 | Method and installation for fractionating gas derived from pyrolysis of hydrocarbons The invention relates to a method for fractionating a gas produced by the pyrolysis of hydrocarbons (1) for the recovery of C2 and higher hydrocarbons, in particular ethylene and ethane, comprising an operation (70) for compressing and dryin... | 03/06/2007 |
| 7165423 | Process for extracting ethane and heavier hydrocarbons from LNG A process for the extraction and recovery of ethane and heavier hydrocarbons (C2+) from LNG. The process covered by this patent maximizes the utilization of the beneficial cryogenic thermal properties of the LNG to extract and recover C2+ form the LNG using a unique... | 01/23/2007 |
| 7159417 | Hydrocarbon recovery process utilizing enhanced reflux streams A process and apparatus for the recovery of ethane and heavier components from a hydrocarbon feed gas stream. Feed gas stream is cooled and separated into a vapor stream and a condensed stream. Vapor stream is divided into a first and a second gas streams. First gas... | 01/09/2007 |
| 7155931 | Liquefied natural gas processing A process and apparatus for the recovery of ethane, ethylene, propane, propylene, and heavier hydrocarbons from a liquefied natural gas (LNG) stream is disclosed. The LNG feed stream is directed in heat exchanger relation with a warmer distillation stream rising fro... | 01/02/2007 |
| 7152429 | Method and installation for separating a gas containing methane and ethane with two columns operating at two different pressures The invention relates to a method of separating a dry feed gas (1) containing mostly methane, ethane and propane into a first product (17), called the treated gas, which is relatively more volatile, and a second product (34), called fraction C2 ... | 12/26/2006 |
| 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 |
| 7127915 | Nitrogen rejection method and apparatus Nitrogen is rejected from a pressurised feed gas stream comprising methane and nitrogen by cooling the feed gas stream in a main heat exchanger 10 and rectifying the cooled feed gas stream in a double rectification column 20 comprising a higher pressur... | 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 |
| 7100399 | Enhanced operation of LNG facility equipped with refluxed heavies removal column Improved methodology for starting up a LNG facility employing a refluxed heavies removal column. The improved methodology involves varying the temperature of the feed to the heavies removal column between start-up and normal operation. This allows a larger amount of... | 09/05/2006 |
| 7069744 | Lean reflux-high hydrocarbon recovery process A two-tower scheme process for the recovery of propane and heavier components from a hydrocarbon gas stream is provided. Feed gas is cooled, partially condensed, and then separated to give a first liquid stream and a first vapor stream. First liquid stream is sent t... | 07/04/2006 |
| 7066972 | Continuous tracer generation apparatus The invention provides an apparatus for online and on-site tracer generation for tagging natural gas stored in underground storage fields wherein feedstock is drawn from a feedstock source. The feedstock undergoes initial analysis to determine hydrocarbon levels. Th... | 06/27/2006 |
| 7059152 | Nitrogen rejection method and apparatus Nitrogen is rejected from a feed natural gas stream comprising methane and nitrogen so as to form a primary methane product. The mole fraction of nitrogen in the feed natural gas increases over a period of time. The feed natural gas stream is cooled in a main heat e... | 06/13/2006 |
| 7051553 | Twin reflux process and configurations for improved natural gas liquids recovery A two-column NGL recovery plant includes an absorber (110) and a distillation column (140) in which the absorber (110) receives two cooled reflux streams, wherein one reflux stream (107) comprises a vapor portion of the NGL and wherein th... | 05/30/2006 |
| 7043938 | Method of thawing a cryogenic unit A method for thawing and removing frozen material from a cryogenic separation unit such as that found in an olefin production plant comprising employing a flushing agent to thaw and remove the frozen material, purging the flushing agent with a gas, and removing resi... | 05/16/2006 |
| 7010937 | Natural gas liquefaction A process for liquefying natural gas in conjunction with producing a liquid stream containing predominantly hydrocarbons heavier than methane is disclosed. In the process, the natural gas stream to be liquefied is partially cooled, expanded to an intermediate pressu... | 03/14/2006 |
| 6945075 | Natural gas liquefaction A process for liquefying natural gas in conjunction with producing a liquid stream containing predominantly hydrocarbons heavier than methane is disclosed. In the process, the natural gas stream to be liquefied is partially cooled, expanded to an intermediate pressu... | 09/20/2005 |
| 6941771 | Liquid natural gas processing 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... | 09/13/2005 |
| 6578378 | Process and installation for recovery and purification of ethylene produced by pyrolysis of hydrocarbons, and gases obtained by this process A process for the high-yield recovery of ethylene and heavier hydrocarbons from the gas produced by pyrolysis of hydrocarbons in which the liquid products resulting from the fractionated condensation of a cracking gas for the recovery of almost all the et... | 06/17/2003 |
| 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 |
| 6449984 | Process for liquefaction of and nitrogen extraction from natural gas, apparatus for implementation of the process, and gases obtained by the process A process for liquefaction of and nitrogen extraction from natural gas, an installation for implementation of the process, and gases obtained by this process. In the process, a first top fraction is cooled and liquefied, separated into a second top fracti... | 09/17/2002 |
| 6401486 | Enhanced NGL recovery utilizing refrigeration and reflux from LNG plants The present invention is directed to methods and apparatus for improving the recovery of the relatively less volatile components from a methane-rich gas feed under pressure to produce an NGL product while, at the same time, separately recovering the relat... | 06/11/2002 |
