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| Number | Title | Issue Date |
| 7437891 | Recovery and purification of ethylene A process for the recovery and purification of ethylene and optionally propylene from a stream containing lighter and heavier components that employs an ethylene distributor column and a partially thermally coupled distributed distillation system. ... | 10/21/2008 |
| 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 |
| 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 |
| 6308532 | System and process for the recovery of propylene and ethylene from refinery offgases A system and process for the recovery of ethylene and propylene from a gas stream, such as a refinery offgas stream. The process comprises withdrawing, cooling, and recovering an overhead vapor stream from a single distillation column. The process include... | 10/30/2001 |
| 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 |
| 6141988 | Process for recovering olefins A process for recovering olefins from a gas stream containing olefins and hydrogen. The process comprises compressing the gas stream in at least one compression stage to form a compressed gas stream, contacting the compressed gas stream with a membrane at... | 11/07/2000 |
| 5983664 | Hydrocarbon gas processing A process for the recovery of ethane, ethylene, propane, propylene and heavier hydrocarbon components from a hydrocarbon gas stream is disclosed. In recent years, the preferred method of separating a hydrocarbon gas stream generally includes supplying at ... | 11/16/1999 |
| 5979178 | Process for recovering olefins from cracked gases A process for recovering olefins from a cracking effluent containing olefins and hydrogen. The process comprises compressing the cracking effluent in at least one compression stage to form a compressed cracking effluent, contacting the compressed cracking... | 11/09/1999 |
| 5979177 | Ethylene plant refrigeration system A refrigeration system for an ethylene plant uses a low pressure demethanizer and a binary refrigerant comprising a mixture of methane and ethylene or methane and ethane. The refrigeration composition may be constant throughout the system or separators ma... | 11/09/1999 |
| 5960643 | Production of ethylene using high temperature demethanization This invention comprises a method of producing ethylene rich product streams from a pressurized charge gas mixture of olefins and other components received from olefin generation/preparation processes. The method of this invention may eliminate the need f... | 10/05/1999 |
| 5884504 | Rectified reflux deethanizer The present invention is an improvement in the combined fractionation steps of deethanization and C2 splitting for ethylene and ethane separation. Theoretical stages are added to the rectification section of a deethanizer above a liquid or vapor sidedraw.... | 03/23/1999 |
| 5881569 | 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 divided into first and second streams, and the second stream is expanded to the fractionation t... | 03/16/1999 |
| 5859304 | Chemical absorption process for recovering olefins from cracked gases The present invention provides an improved method for recovering high purity olefins from cracked gas effluents or other parafin/olefin gaseous mixtures by use of a chemical absorption process.... | 01/12/1999 |
| 5724833 | Control scheme for cryogenic condensation In a cryogenic condensation scheme used for benzene removal in a process for liquefying natural gas, two series connected separation columns are provided with a feedstream precooled in a heat exchanger to a temperature that will at least condense the benz... | 03/10/1998 |
| 5680775 | Demixing sidedraws for distillation columns The present invention provides one or more sidedraws, from the stripping section of a column, of a heavy key component in the presence of a desirable heavier than heavy key component. In addition, the present invention provides one or more sidedraws, from... | 10/28/1997 |
| 5678424 | Rectified reflux deethanizer The present invention is an improvement in the combined fractionation steps of deethanization and C2 splitting for ethylene and ethane separation. Theoretical stages are added to the rectification section of a deethanizer above a liquid or vapor sidedraw.... | 10/21/1997 |
| 5634354 | Olefin recovery from olefin-hydrogen mixtures Olefins are recovered from thermally cracked gas or fluid catalytic cracking off gas by cooling the gas to condense a portion of the hydrocarbons, removing hydrogen from the noncondensed gas, and condensing the remaining hydrocarbons in a cold condensing ... | 06/03/1997 |
| 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 |
| 5611216 | Method of load distribution in a cascaded refrigeration process A process, apparatus and control methodology for transferring loads between drivers in adjacent refrigeration cycles in a cascaded refrigeration process has been developed thereby enabling more efficient driver operation. Load transfer is effected by cool... | 03/18/1997 |
| 5561988 | Retrofit unit for upgrading natural gas refrigeraition plants A retrofitted unit to an existing simple refrigerated natural gas plant that substantially increases the amounts of propane, butanes and natural gasoline, or ethane, propane, butanes and natural gasoline recovered from the natural gas in the existing gas ... | 10/08/1996 |
| 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 |
| 5444176 | Process for recovering olefins from cat-cracked gas without accumulating undesirable oxides of nitrogen A safe, effective, and economical method is provided for recovering olefins from cat-cracked gases without accumulating dangerous amounts of nitrogen oxides. A stream of cat-cracked gas first is scrubbed to remove acid gases, including nitrogen dioxide (N... | 08/22/1995 |
| 5435436 | Thermomechanically integrated distillation of close-boiling light hydrocarbons A thermomechanically integrated distillation column and method for the separation of ethylene from ethane and other close-boiling light hydrocarbons. The column has a plurality of sections operated at successively lower pressures from a high pressure subc... | 07/25/1995 |
| 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 |
| 5414168 | Absorption and cold separation process for recovering purified hydrogen from a catalytic dehydrogenation zone effluent Purified hydrogen is recovered from the effluent of a catalytic dehydrogenation zone using an integrated cold absorption process. The effluent, which contains olefinic hydrocarbons and hydrogen is compressed, cooled and contacted with a liquid absorbent. ... | 05/09/1995 |
| 5379597 | Mixed refrigerant cycle for ethylene recovery A closed-loop mixed refrigerant cycle provides efficient low-level refrigeration for recovering ethylene from a mixed gas feed. Compressed mixed refrigerant vapor is condensed at -20° F. to -50° F. and is subcooled to -175° F. to -225° F. by indirect ... | 01/10/1995 |
| 5377490 | Open loop mixed refrigerant cycle for ethylene recovery Refrigeration is provided in an ethylene recovery plant by an open-loop mixed refrigeration cycle which utilizes components present in the ethylene-containing feed gas as the mixed refrigerant. Refrigeration is provided by subcooled mixed refrigerant at -... | 01/03/1995 |
| 5372009 | Cryogenic distillation A cryogenic technique for recovering pure products from a mixture of at least three close-boiling components. A preferred process is provided for separating a hydrocarbon mixture containing an alkene (i.e. ethene or propene), corresponding alkane having t... | 12/13/1994 |
| 5361589 | Precooling for ethylene recovery in dual demethanizer fractionation systems Ethylene-containing feed gas to a cryogenic ethylene recovery system is cooled and condensed, prior to fractionation, by an improved method which utilizes a combination of one or more partial condensers followed by one or more dephlegmators. The improved ... | 11/08/1994 |
| 5326929 | Absorption process for hydrogen and ethylene recovery A continuous process is described for contacting an olefins-containing feed gas stream, which has been freed of CO2 and sulfur compounds, compressed, cooled, and dried, with a solvent in an intercooled and reboiled demethanizing absorber to pro... | 07/05/1994 |
| 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 |
| 5220097 | Front-end hydrogenation and absorption process for ethylene recovery A continuous process is described for contacting an olefins-containing feed gas stream, freed of CO2 and sulfur compounds, in a front-end heat-pumped depropanizer to remove the C4+ compounds, selectively hydrogenating the overhead st... | 06/15/1993 |
| 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 |
| 5019143 | Low pressure noncryogenic processing for ethylene recovery A continuous process is described for contacting an olefins-containing feed gas stream 251 l in a demethanizing-absorber column 252, having at least one reboiler 254with a specified lean physical solvent stream 257 to produce a rich solvent bottoms stream... | 05/28/1991 |
| 4895584 | Process for C2 recovery An improved process for separating a hydrocarbon bearing feed gas containing methane and lighter, C2 (ethylene and ethane) and heavier components into a fraction containing predominantly methane and lighter components and a fraction containing ... | 01/23/1990 |
| 4889545 | 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 divided into first and second streams. The first stream is cooled to condense substantially all... | 12/26/1989 |
| 4885063 | Method and apparatus for olefin recovery A process and apparatus are disclosed for recovering olefins, particularly C3, C4, and C5 olefins, from gaseous mixture thereof with lower-boiling components. The olefin-containing gas mixtures is compressed and cooled to ... | 12/05/1989 |
| 4832718 | Processing nitrogen-rich, hydrogen-rich, and olefin-rich gases with physical solvents A continuous process is disclosed for separating components of a hydrocarbon gas stream which are selected from the group consisting of hydrogen, nitrogen, methane, ethylene, ethane, higher saturated and unsaturated hydrocarbons, and mixtures thereof by c... | 05/23/1989 |
| 4767428 | Nitrogen removal system A process for separating a nitrogen rich hydrocarbon stream is disclosed. The process includes cooling the stream in a series of indirect heat exchanges to separate successively lighter components from heavier components of the stream. After the first coo... | 08/30/1988 |
| 4753667 | Propylene fractionation A propane-propylene splitter is operated by compressing the propylene overhead to increase its condensing temperature, using the compressed overhead to heat bottoms in a reboiler, which is operated to condense the overhead and remove a maximum amount of h... | 06/28/1988 |
