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| Number | Title | Issue Date |
| 8124824 | System and method for using super critical state carbon dioxide (CO) as a hydrocarbon diluent A system and method for the use of super critical CO2 as a carrying or suspension agent for transport of extracted or processed hydrocarbons. The super critical state CO2 is then co-mingled with the extracted or processed hydrocarbons and trans... | 02/28/2012 |
| 7709693 | Toluene production A method for optimizing the production of nitration grade toluene from a solvent extraction process that produces an aromatic rich extract and a saturate rich raffinate, comprising adding an effective amount of the raffinate back to the extract. ... | 05/04/2010 |
| 7358410 | Processes for forming polypropylene from an oxygenate-contaminated monomer feedstock The present invention provides various processes for producing polypropylene from an oxygenate-contaminated propylene-containing feedstock, preferably derived from an oxygenate to olefin reaction system. In one embodiment, the process includes providing a propylene-... | 04/15/2008 |
| 7348466 | Solvent extraction In a method for the solvent extraction of butadiene from a mixture of hydrocarbons having four carbon atoms per molecule, which method inherently produces tars, the extraction process is operated with a tar loading level, relative to the solvent employed, of no more... | 03/25/2008 |
| 7205447 | Process for removing aldehydes and/or ketones from an olefinic stream The present invention provides a process for removing an oxygenate impurity selected from aldehyde and/or ketone, from an olefinic product stream. A product stream is contacted with a metal oxide-containing catalyst in the presence of a C1 to C6 | 04/17/2007 |
| 7135604 | Process for separating carbon dioxide from an oxygenate-to-olefin effluent stream The present invention is a process for removal of carbon dioxide from a reactor effluent stream comprising water, carbon dioxide and olefin(s), where a portion of the carbon dioxide is removed in a quenching step with a quench medium and more carbon dioxide is remov... | 11/14/2006 |
| 7094937 | Compositions comprising cyclohexamantane Disclosed are compositions comprising C26H30 hexamantane, referred to herein as peri-condensed hexamantane, fully condensed hexamantane, and cyclohexamantane. These enriched cyclohexamantane compositions comprise at least 5 percent by weight cy... | 08/22/2006 |
| 7078580 | Process for separating aromatics by extractive distillation and a composite solvent used therein This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8–C11 aromatics hav... | 07/18/2006 |
| 7074971 | Recovery of ethylene and propylene from a methanol to olefin reaction system The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetyl... | 07/11/2006 |
| 6960279 | Method for stabilizing vinyl aromatic monomers using selected polymerization inhibitors and polymers prepared therewith Disclosed is the observation that 7-aryl-quinone methides and 4-tert-butylcatechol, when used in combination in a vinyl aromatic monomer to inhibit polymerization,do not inhibit polymerization to the same extend as each would if used separately. Stated another way, ... | 11/01/2005 |
| 6838587 | Method of removing oxygenate contaminants from an olefin stream This invention is directed to a method of removing acetaldehyde, CO2 and/or water from an ethylene and/or propylene containing stream. In this invention, acetaldehyde and C4+ olefins are substantially removed from the ethylene and/or propylene ... | 01/04/2005 |
| 6664433 | Process for the purification of aromatic hydrocarbons and process for the preparation of high-purity aromatic hydrocarbons This invention provides a process for purifying to a high degree of purity aromatic hydrocarbons containing impurities which are difficult to separate by distillation such as sulfur compounds and nitrogen compounds. The process of this invention for purif... | 12/16/2003 |
| 6565742 | Aromatics separation process and method of retrofitting existing equipment for same An improved process for the recovery of aromatic compounds from a mixture containing aromatic and non-aromatic compounds and method for retrofitting existing equipment for the same is provided. The improved process comprises the steps of recovering aromat... | 05/20/2003 |
| 6545192 | Process for separating olefins from saturated hydrocarbons A process for separating and isolating olefins from saturated hydrocarbons, preferably in a Fischer Tropsch stream, by adducting the olefins with a linear polyaromatic compound and separating the adducts from the remainder, which comprises saturated hydro... | 04/08/2003 |
| 6483000 | Process for the manufacture in pure form of 1-pentene or an alpha-olefin lower than 1-pentene The invention relates to a process for the recovery as a feedstock of an alpha-olefin from a mixture containing mainly hydrocarbon compounds, such as is obtained by Fischer-Tropsch-synthesis after an at least crude separation of components boiling higher ... | 11/19/2002 |
| 6395953 | Process for preparing purified conjugated diene Processes for producing a purified conjugated diene comprise feeding a petroleum fraction containing the conjugated diene to an extractive distillation column, feeding an extraction solvent to the extractive distillation column, and extractive-distilling ... | 05/28/2002 |
| 6392115 | Separation of hydrocarbons by extractive distillation A process for separating a first hydrocarbon, selected from the group consisting of aromatic hydrocarbons, cycloalkanes, cycloalkenes, cycloalkadienes and combinations thereof, from a close-boiling second hydrocarbon, selected from the group consisting of... | 05/21/2002 |
| 6348136 | Method and apparatus for the purification of vinyl aromatic compounds The present invention is directed to an apparatus and method for the distillation of a readily polymerizable vinyl aromatic compound employing a polymerization inhibitor. The vinyl aromatic compound is subjected to distillation in at least one fractionati... | 02/19/2002 |
| 5972172 | Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by extractive distillation 1,2,4-Trimethylbenzene is difficult to separate from 1,2,3-trimethylbenzene by conventional distillation or rectification because of the proximity of their boiling points. 1,2,4-trimethylbenzene can be readily separated from 1,2,3-trimethylbenzene by extr... | 10/26/1999 |
| 5942655 | Process for the removal of heavy hydrocarbonaceous co-products from a vapor effluent from a normally gaseous hydrocarbon dehydrogenation reaction zone A process for the removal of trace quantities of polynuclear aromatic compounds from the vapor effluent of a hydrocarbon dehydrogenation zone containing normally gaseous olefinic hydrocarbons, trace mononuclear aromatic compounds and trace polynuclear aro... | 08/24/1999 |
| 5877385 | Process including extractive distillation and/or dehydrogenation to produce styrene from petroleum feedstock including ethyl-benzene/xylene mixtures Disclosed is a process for recovering styrene from a feedstock containing at least styrene, ethylbenzene, and one or more aromatic or non-aromatic hydrocarbon compounds which includes separating said feedstock into a first stream relatively more concentra... | 03/02/1999 |
| 5849982 | Recovery of styrene from pyrolysis gasoline by extractive distillation An extractive distillation process for separating at least one substituted unsaturated aromatic from a pyrolysis gasoline mixture, containing said aromatic and at least one close-boiling aromatic or non-aromatic hydrocarbon, employing a two part extractiv... | 12/15/1998 |
| 5763714 | Process and apparatus for the production and recovery of p-xylene A mixed aromatic stream is hydrotreated to remove olefins and fractionated to separate C9 + heavies in a distillation column reactor and the C8 and lighter material is fed to a selective adsorption unit where the para-xylene is remov... | 06/09/1998 |
| 5723026 | Process for recovering pure benzene and pure toluene from aromatic hydrocarbon products The production of high purity benzene and high purity toluene is obtained by utilizing the initial gas separating column for the treatment of the aromatic containing starting material as a separating column for separating a benzene rich from a toluene ric... | 03/03/1998 |
| 5672804 | Process for the removal of polynuclear aromatic compounds from a vapor effluent from a normally gaseous hydrocarbon dehydrogenation reaction zone A process for the removal of trace quantities of polynuclear aromatic compounds from the vapor effluent of a hydrocarbon dehydrogenation zone containing normally gaseous olefinic hydrocarbons, trace mononuclear aromatic compounds and trace polynuclear aro... | 09/30/1997 |
| 5663337 | Pharmaceutically active benzoquinazoline compounds The present invention relates to benzoquinazoline thymidylate synthase inhibitors, processes for preparing them and pharmaceutical formulations containing them.... | 09/02/1997 |
| 5630914 | Method and apparatus for decontaminating a liquid A method for decontaminating a liquid of a contaminant having a vapor pressure which is higher than the vapor pressure of the liquid. A contaminated liquid is directed through an inclined conduit. A gas is directed into the inclined conduit, whereby the g... | 05/20/1997 |
| 5554264 | Multiple reboiler system To heat the circulating reboiler streams of multiple distillation columns a fired reboiler is provided for a first column requiring the most heat. A portion of the bottoms from the first column is passed through the tubes of the heater in the fired reboil... | 09/10/1996 |
| 5417812 | Separation of ethyl benzene from xylenes by azeotropic distillation Ethyl benzene is difficult to separate from xylenes by conventional distillation or rectification because of the proximity of their boiling points. Ethyl benzene can be readily separated from xylenes by azeotropic distillation. Effective agents for separa... | 05/23/1995 |
| 5399244 | Process to recover benzene from mixed hydrocarbons by extractive distillation Benzene and other aromatics are separated from a stream of mixed hydrocarbons containing both aromatics and non-aromatics by extractive distillation with a solvent system containing dimethyl sulfoxide and optionally a co-solvent, preferably water, followe... | 03/21/1995 |
| 5275702 | Distillation method of separating organic solvents The present invention discloses a method to separate each component from a mixed solution of organic solvents obtained during the production of -L-aspartyl-L-phenylalanine methyl ester, which is useful as a sweetener, namely, a mixed solution of ac... | 01/04/1994 |
| 5202520 | Method for aromatic hydrocarbon recovery A method is provided for the recovery of aromatic hydrocarbons from the extract phase of aromatic-selective solvent extraction process which involves withdrawing a vapor side-cut fraction containing aromatic hydrocarbons and solvent from a stripping zone ... | 04/13/1993 |
| 5185486 | Method of reducing the benzene content of gasolines The benzene content of hydrocarbon gasolines is accomplished by (a) fractionating at least one hydrocarbon gasoline into a light fraction A, with an increased benzene content, and a heavy fraction B, with a reduced benzene content; (b) contacting the ligh... | 02/09/1993 |
| 5073669 | Method for aromatic hydrocarbon recovery Methods are provided for the recovery of aromatic hydrocarbons from the extract phase of aromatic-selective solvent extraction processes which involve withdrawing a vapor side-cut fraction containing aromatic hydrocarbons and solvents from a stripping zon... | 12/17/1991 |
| 5062948 | Mercury removal from liquid hydrocarbon compound The invention provides a method for removing mercury from a liquid hydrocarbon feed material by (a) removing those components having a higher molecular weight than the desired hydrocarbon from the feed material, (b) removing water from the feed material, ... | 11/05/1991 |
| 5032232 | Extractive distillation of hydrocarbon mixtures Extractive distillation processes for separating aromatic hydrocarbon(s) or cycloalkane(s) or alkene(s) from close-boiling alkane(s) are carried out with a solvent including at least one N-alkyl-2-thiopyrrolidone compound, preferably N-methyl-2-thiopyrrol... | 07/16/1991 |
| 5012034 | Process for separating styrene from styrene-containing hydrocarbon streams This invention relates to a process for extracting styrene from a styrene-containing hydrocarbon feedstock by: (a) reacting the feedstock with an anthracene at a temperature ranging of from about 175° to about 275° C. to form a styrene adduct with anthr... | 04/30/1991 |
| 5004851 | Process to produce aromatics of low acid-wash color Nitration Grade benzene is made from a benzene stream with impurities including olefins by first fractionally distilling the benzene to a purity of at least 99 mole percent and subsequently passing the stream in a liquid phase in the presence of hydrogen ... | 04/02/1991 |
| 5004853 | Continuous process for the production of 2,6-dimethylnaphthalene A continuous process is presented for the production and recovery of a high purity stream of 2,6-dimethylnaphthalene. The process comprises the general steps of: fractionating a hydrocarbon feed stream to recover a process stream rich in the various isome... | 04/02/1991 |
| 4997547 | Method for the production of an aromate concentrate suitable for use as blending component for fuel In the method for the production of an aromate concentrate suitable for use as blending component for gasifier fuel, feed hydrocarbon mixtures having boiling ranges substantially between 40° and 170° C., are subjected, without any previous separation in... | 03/05/1991 |
