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| Number | Title | Issue Date |
| 7435318 | Ionic liquids as selective additives for separation of close-boiling or azeotropic mixtures The invention relates to a process for separating close-boiling, homo- and heteroazeotropic mixtures by using ionic liquids. Due to the selectivity and unusual combination of properties of the ionic liquids the process is superior to conventional extractive rectific... | 10/14/2008 |
| 7388122 | Dewaxing aid The present invention relates to dewaxing aids comprising the mixture of two or more polyalkyl(meth)acrylates having an exothermic heat initiation temperature within the specific range when chilled at 30° C./minute rate, to be added together with the wax-containing... | 06/17/2008 |
| 7355087 | Production of 1-alkenes from mixed olefin streams using catalytic distillation A catalytic distillation process for isomerizing and separating 1-alkenes from a mixed alkene stream. The process comprises contacting a mixed alkene stream comprising the 1-alkene and homologs thereof with a supported isomerization catalyst under isomerization/dist... | 04/08/2008 |
| 7223331 | Method for settling suspended fine inorganic solid particles from hydrocarbon slurry and additive for use therewith Disclosed is a method for settling suspended finely divided inorganic solid particles from a hydrocarbon slurry using an additive. The additive comprises (a) a hydroxy-terminated polyoxyalkylate chain(s) containing polymer having at least one oxygen atom and at leas... | 05/29/2007 |
| 7204927 | Settling aids for solids in hydrocarbons A treatment for accelerating the settling of finely divided solids in hydrocarbon fluids, including adding to the hydrocarbon a sufficient settling amount of a combination of at least two of (a) a quaternary fatty ammonium compound, (b) a hetero-atom punctuated fatt... | 04/17/2007 |
| 7048847 | Settling aids for solids in hydrocarbons A treatment for accelerating the settling of finely divided solids in hydrocarbon fluids, including adding to the hydrocarbon a sufficient settling amount of a combination of (a) a polyacrylic acid adducted alkylphenol-formaldehyde resin alkoxylate compound, and (b)... | 05/23/2006 |
| 6781026 | Aromatics purification from petroleum streams A process for separating a feed mixture comprising at least one aromatic hydrocarbon and at least one non-aromatic hydrocarbon by extractive distillation (ED) utilizing a solvent mixture comprising sulfolane and at least one co-solvent. The co-solvent is an alkyl su... | 08/24/2004 |
| 6617483 | Polyalkylene glycol compositions for enhanced aromatic extraction The invention relates to extractive distillation compositions for separating a mixture of hydrocarbon compounds, wherein the extractive distillation composition includes at least one alkylene glycol compound, and at least one compatibility agent, wherein ... | 09/09/2003 |
| 6576806 | Process for separating C2-C3 olefins from industrial gases A process for treating a feedstock comprising olefins having an average carbon number ranging from 2-3.5, and non-olefinic compounds, said process comprising the following steps: a) contacting gaseous feedstock with a linear polyaromatic compound in a rea... | 06/10/2003 |
| 6555726 | Methods for enhanced extractive distillation employing extractive distillation compositions comprising sulfolane and compatibility agent The invention relates to methods for enhanced extractive distillation of hydrocarbons that employ extrative distillation compositions comprising sulfolane or sulfolane derivatives in comination with compatibility agents.... | 04/29/2003 |
| 6410817 | Ethylene recovery system Ethylene is a commodity chemical used as a reactant in the production of vinyl acetate. Ethylene is relatively expensive thus making its recovery and re-use in the process encouraged. The present invention provides a method for the recovery of ethylene fr... | 06/25/2002 |
| 6395141 | Separation of components from aromatic hydrocarbon mixtures thereof by extractive distillation A method of separating aromatic hydrocarbons and non-aromatic hydrocarbons, and aromatic hydrocarbons and naphtenes involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent... | 05/28/2002 |
| 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 |
| 6316685 | Method for separating solids from hydrocarbon slurries Disclosed is a method for separating finely divided solids from a hydrocarbon slurry by using an additive that comprises a polymer and, optionally, an alkylbenzene sulfonic acid; and a composition of the additive thereof. The polymer is a polymer having (... | 11/13/2001 |
| 6175050 | Process for separating functionalized alpha olefins from functionalized internal olefins This invention relates to a process for separating functionalized alpha olefins from functionalized internal olefins. The process achieves by a step of contacting a feedstock containing functionalized alpha olefins and functionalized internal olefins with... | 01/16/2001 |
| 6165368 | Method of controlling deposition of foulants in processing equipment used to process products streams produced by the dehydrogenation of aliphatic hydrocarbons A method for controlling the deposition of foulants such as polynuclear aromatic compounds on the internal surfaces of equipment in a processing train used to process a product stream obtained by dehydrogenating an aliphatic compound containing from 2 to ... | 12/26/2000 |
| 6136155 | Separation of mesitylene from 1,2,4-trimetyhlbenzene by azeotropic distillation Mesitylene is difficult to separate from 1,2,4-Trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are isopropyl acetate, 2-pentanol and acetonitrile.... | 10/24/2000 |
| 6033529 | Separation of mesitylene from 4-ethyl toluene by azeotropic distillation Mesitylene cannot be separated from 4-ethyl toluene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are isopropyl palmitate, triacetin and methyl salicylate.... | 03/07/2000 |
| 5922193 | Addition of ethers or aldehydes to furfural for aromatic extractions A process to improve the performance of furfural for aromatics extraction from gas oils and lube distillates by the addition of ethers and/or aldehydes, preferably having a dielectric constant less than about 40 @ 25° C.... | 07/13/1999 |
| 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 |
| 5840160 | Separation of 3-carene from limonene by extractive distillation 3-Carene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. 3-Carene can be readily separated from limonene by extractive distillation. Effective agents are o-cresol, 2,6-... | 11/24/1998 |
| 5720857 | Separation of 1,2,4-trimethylbenzene from 1,2,3-trimethylbenzene by azeotropic distillation 1,2,4-Trimethylbenzene is difficult to sepparate from 1,2,3-trimethylbenzene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are 1-propanol, methyl formate and 1-nitropropane.... | 02/24/1998 |
| 5714658 | Process for the extraction of carotenes from natural sources For the extraction of carotenes, in particular of ଲ-carotene, from natural sources, these are stirred for several hours at at least 30° C. in a solvent mixture composed of acetic esters of C1 -C4 alcohols as well as a portion ... | 02/03/1998 |
| 5698080 | Separation of phellandrene from limonene by azeotropic distillation Phellandrene is difficult to separate from limonene because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are ethanol, dioxolane and acetonitrile.... | 12/16/1997 |
| 5675055 | Acidification/extraction treatment of waste caustic stream The waste organics containing caustic stream from a propylene oxide/styrene monomer process is preferably first concentrated by distillation and then contacted with strong acid such as sulfuric acid and an organic solvent, the admixture is phase separated... | 10/07/1997 |
| 5597455 | Separation of 3-carene and limonene by extractive distillation 3-Carene and limonene cannot be separated from each other by rectification because of the closeness of their boiling points. They are readily separated by extractive distillation. Effective agents are: diethylene glycol phenyl ether, nonyl phenol, triprop... | 01/28/1997 |
| 5582693 | Separation of 3-carene and limonene by azeotropic distillation 3-Carene and limonene cannot be separated from each other by rectification because of the closeness of their boiling points. They are readily separated by azeotropic distillation. Effective agents are: cyclopentanol, 2-nitropropane, ethyl formate amyl ace... | 12/10/1996 |
| 5563315 | Separation of aromatic hydrocarbons from a mixture of aromatic and non-aromatic hydrocarbons by solute swing extraction The invention relates to a process for separating aromatic hydrocarbons from a mixed hydrocarbon feed employing a selective solvent which exhibits a low critical solution temperature of the solvent with a solute. The mixed hydrocarbon feed is passed to an... | 10/08/1996 |
| 5516965 | Unsaturates recovery and recycle process The invention relates to a process for recovering unreacted unsaturated hydrocarbons from an effluent stream of a process for synthesizing oxygenated hydrocarbons from unsaturated hydrocarbons, said stream containing unreacted unsaturated hydrocarbons, ox... | 05/14/1996 |
| 5481059 | Settling aids for solids in hydrocarbons A method for accelerating the settling of finely divided solids in hydrocarbon fluids comprising adding to the hydrocarbon a sufficient settling amount of a polyacrylic acid adducted alkylphenol-formaldehyde resin alkoxylate compound. Preferably, the hydr... | 01/02/1996 |
| 5476987 | Method of removing halogenated aromatic compound from hydrocarbon oil A safe and reliable method of removing halogenated aromatic compounds present in small amounts in hydrocarbon oil constituted mainly by non-aromatic hydrocarbon oil. The hydrocarbon oil is contacted with a heat-resistant alkaline polar solvent in the pres... | 12/19/1995 |
| 5466345 | Separation of o-xylene from p-xylene and m-xylene by azeotropic distillation o-Xylene cannot be separated from p-xylene and m-xylene by conventional distillation or rectification because of the proximity of their boiling points. o-Xylene can be readily separated from mixtures of p-xylene and m-xylene by azeotropic distillation. Ef... | 11/14/1995 |
| 5460700 | Separation of 1-hexene from hexane by extractive distillation 1-Hexene is difficult to separate from hexane by conventional distillation or rectification because of the proximity of their boiling points. 1-Hexene can be readily separated from hexane by extractive distillation. Effective agents are hexyl acetate, met... | 10/24/1995 |
| 5458741 | Separation of benzene from close boiling hydrocarbons by extractive distillation Benzene is difficult to separate from cyclohexane or cyclohexene by conventional distillation or rectification because of the close proximity of their boiling points. Benzene can be readily separated from cyclohexane or cyclohexene by using extractive dis... | 10/17/1995 |
| 5453167 | Separation of xylenes by extractive distillation p-Xylene cannot be separated from m-xylene by distillation or rectification because of the proximity of their boiling points. p-Xylene can be separated from m-xylene by means of extractive distillation. Effective agents are 3-ethylphenol and isopropyl pal... | 09/26/1995 |
| 5446233 | Ethylene plant caustic system emulsion breaking with salts of alkyl sulfonic acids A process for breaking the emulsion which commonly forms in the caustic system of olefin plants comprising mixing the emulsion with an effective amount of a Group II metal salt of an alkyl aryl sulfonic acid, wherein the alkyl contains 4-24 carbon atoms, ... | 08/29/1995 |
| 5445715 | Separation of m-xylene from xylenes by azeotropic distillation m-Xylene is very difficult to separate from mixtures of p-xylene and o-xylene by conventional distillation or rectification because of the proximity of their boiling points. m-Xylene can be readily separated from p-xylene and mixtures of p-xylene and o-xy... | 08/29/1995 |
| 5443697 | Separation of heptane from 1-heptene by extractive distillation Heptane is difficult to separate from 1-heptene by conventional distillation or rectification because of the proximity of their boiling points. Heptane can be readily separated from 1-heptene by extractive distillation. Effective agents are diacetone alco... | 08/22/1995 |
| 5441608 | Separation of xylenes by extractive distillation p-Xylene cannot be separated from m-xylene by distillation or rectification because of the proximity of their boiling points. p-Xylene can be separated from m-xylene by means of extractive distillation. Effective agents are 3-ethylphenol and 1,1,2-trichlo... | 08/15/1995 |
