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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 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 |
| 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 |
| 7019188 | Use of ionic liquids to separate olefins, diolefins and aromatics The present invention relates to the separation of olefins, diolefins and lower aromatics from mixed streams of hydrocarbons using ionic liquids in the absence of metal compounds. The present invention eliminates the metal complexes conventionally used in such separ... | 03/28/2006 |
| 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 |
| 6689926 | Process for purifying styrene monomer feedstock prior to polymerization A process is disclosed which provides for the reduction of phenylacetylene levels in styrene monomer feedstreams, which process utilizes a normal styrene inhibitor additive, such as an hydroxylamine, injected into the styrene monomer feedstream immediatel... | 02/10/2004 |
| 6483003 | Removal of impurities from a hydrocarbon component or fraction A process for removing impurities from a hydrocarbon component or fraction comprises mixing, in a liquid-liquid extraction step, an impurity-containing liquid hydrocarbon component or fraction, as an impure liquid hydrocarbon feedstock, with an acetonitri... | 11/19/2002 |
| 6407306 | Process for extracting carotenes from carotene-containing materials A process is described for extracting carotenes from carotene-containing materials, in particular from fats and oils of biological origin, which provides for extraction of carotene-containing material with an extractant comprising at least one member sele... | 06/18/2002 |
| 6114593 | Method for reducing organic fluoride levels in hydrocarbons A system and/or process for decreasing the level of at least one organic fluoride present in a hydrocarbon mixture by first passing the hydrocarbon mixture to an eductor and educting into the hydrocarbon mixture a catalyst comprising a volatility reducing... | 09/05/2000 |
| 5951916 | Solutions of buckminsterfullerene (C60 ) in n-ethyl-2-pyrrolidone (NEP) A solution comprising a polar solvent and C60 in which the solubility of C60 is at least 2 mg/ml of solvent. The polar solvent has a low toxicity, high boiling point, high thermal and electrochemical stability, low viscosity, low fre... | 09/14/1999 |
| 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 |
| 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 |
| 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 |
| 5405504 | Separation of 1-decene from 2-octanone by azeotropic distillation 1-Decene is impossible to separate from 2-octanone by conventional distillation or rectification because the two compounds form a minimum boiling azeotrope. 1-Decene can be readily separated from 2-octanone by azeotropic distillation. Effective agents are... | 04/11/1995 |
| 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 |
| 5393385 | Separation of hexane from vinyl acetate and methyl acrylate by extractive distillation Hexane is difficult to separate from vinyl acetate and/or methyl acrylate by conventional distillation or rectification because of the closeness of their boiling points. Hexane can be readily separated from vinyl acetate and/or methyl acrylate by extracti... | 02/28/1995 |
| 5391264 | Separation of alpha-Phellandrene from d-limonene by azeotropic distillation alpha-Phellandrene is difficult to separate from d-limonene by conventional distillation or rectification because of the proximity of their boiling points. alpha-Phellandrene can be readily separated from d-limonene by azeotropic distillation. Effective a... | 02/21/1995 |
| 5382330 | Separation of 1-octene from octane by azeotropic distillation 1-Octene is difficult to separate from octane by conventional distillation or rectification because of the proximity of their boiling points. 1-Octene can be readily separated from octane by azeotropic distillation. Effective agents are ethyl formate, eth... | 01/17/1995 |
| 5380405 | Separation of alpha-phellandrene from 3-carene by azeotropic distillation alpha-Phellandrene is difficult to separate from 3-carene by conventional distillation or rectification because of the proximity of their boiling points. alpha-phellandrene can be readily separated from 3-carene by azeotropic distillation. Effective agent... | 01/10/1995 |
| 5277766 | Separation of n-heptane from vinyl acetate by extractive distillation Heptane cannot be removed from heptane-vinyl acetate mixtures by distillation because of the minimum boiling azeotrope. Heptane can be readily removed from vinyl acetate by extractive distillation. Typical effective agents are dimethylsulfoxide, phenol, d... | 01/11/1994 |
| 5262015 | Separation of octene-1 from its isomers by azeotropic and extractive distillation Octene-1 is difficult to separate from several of its isomers by conventional distillation or rectification because of the closeness of their boiling points. Octene-1 can be readily separated from its close boiling isomers by azeotropic or extractive dist... | 11/16/1993 |
| 5258102 | Separation of heptane from vinyl acetate by azeotropic distillation Heptane cannot be separated from vinyl acetate by conventional distillation or rectification because of the minimum boiling azeotrope. Heptane can be readily separated from vinyl acetate by using azeotropic distillation. Typical examples of effective agen... | 11/02/1993 |
| 5256259 | Separation of hexane from vinyl acetate by azeotropic distillation Hexane cannot be separated from vinyl acetate by conventional distillation or rectification because of the minimum boiling azeotrope. Hexane can be readily separated from vinyl acetate by using azeotropic distillation. Typical examples of effective agents... | 10/26/1993 |
| 5238540 | Method of obtaining a pure aromatic hydrocarbon from a sump product of an extractive distillation of a hydrocarbon mixture The method of obtaining a pure aromatic hydrocarbon from a hydrocarbon starting mixture includes extractively distilling the hydrocarbon starting mixture with a selective solvent; feeding the sump product of the extractive distillation through a first and... | 08/24/1993 |
| 5167797 | Removal of sulfur contaminants from hydrocarbons using N-halogeno compounds The present invention is directed to a process for removal of sulfur contaminants from hydrocarbons using processes which rely upon the reaction of organosulfur compounds with N-halogeno compounds. The sulfur removal may be effected by using liquid/liquid... | 12/01/1992 |
| 5157202 | Gas absorption for separation of hydrocarbons For recovery of low-boiling hydrocarbons by scrubbing, the crude gas mixture which contains low-boiling and high-boiling hydrocarbons, is treated with a scrubbing agent, by which the high-boiling components are scrubbed-out of the gas mixture. The loaded ... | 10/20/1992 |
| 5068011 | Separation of monoolefins from paraffins An extractive distillation process for separating at least one C4 -C10 alkene (monoolefin) from at least one close-boiling alkane employs solvent at least one N-mercaptoalkyl-2-pyrrolidone, preferably N-(ଲ-mercaptoethyl)-2-pyrr... | 11/26/1991 |
| 4851087 | Separation of m-diisopropylbenzene from p-diisopropyl benzene by azeotropic distillation with nitrogenous compounds Meta and para-diisopropylbenzenes cannot be easily separated from each other by distillation because of the closeness of their vapor pressures. m-Diisopropylbenzene can be readily removed from p-diisopropylbenzene by azeotropic distillation using certain ... | 07/25/1989 |
| 4299667 | Process for recovering pure benzene A process for recovering pure benzene from hydrocarbon mixtures containing the same and non-aromatic compounds which are gaseous and difficultly condensible is described in which the feedstock is fed to an initial distillation column operated at atmospher... | 11/10/1981 |
| 4278504 | Isolation of a conjugated diolefin from a C4 - or C5 -hydrocarbon mixture A process for isolating a conjugated diolefin from a C4 - or C5 -hydrocarbon mixture containing the diolefin, by single-stage or multi-stage extractive distillation using a selective solvent, wherein the selective solvent is a solven... | 07/14/1981 |
| 4278505 | Process of recovering an n-hexane product which is free from aromatic compounds A process of recovering an n-hexane product which is free from aromatic compounds by extractive distillation from a mixture of aromatic and non-aromatic compounds. The mixture is fed to and distilled in a first distillation column, from which a benzene-co... | 07/14/1981 |
| 4277315 | Isolation of a conjugated diolefin from a C4 - or C5 -hydrocarbon mixture A process for isolating a conjugated diolefin from a C4 - or C5 -hydrocarbon mixture containing the diolefin, by single-stage or multi-stage extractive distillation using a selective solvent, wherein the selective solvent is a solven... | 07/07/1981 |
| 4177250 | Method of removing acetylene and sulfur compounds from gases by absorption in dimethyl formamide Dimethyl formamide when used as an absorption solvent to remove acetylenes from olefin-containing gas streams acts as well as a promoter for the oxidative conversion of H2 S, COS, and/or CS2, also contained in the feed stream, to ele... | 12/04/1979 |
| 4168209 | Process for purifying benzene and toluene by extractive azeotropic distillation Process for separating benzene and/or toluene from mixtures thereof with saturated hydrocarbons, by extractive distillation using an aliphatic N-alkylamide as extraction solvent, comprising introducing in the distillation column, above the level of introd... | 09/18/1979 |
| 4143085 | Method for isolating low molecular weight polymer A method for isolating a low molecular weight polymer from a solution of a low molecular weight polymer having a viscosity of 5 to 100,000 cps at 30° C. and an inactivated catalyst in a hydrophobic organic solvent, which comprises mixing an acidic, alkal... | 03/06/1979 |
| 4122126 | Method for removing aluminum halide catalyst from polymerization product Disclosed is a method for removing an aluminum halide or its complex catalyst from a polymerization product comprising the steps of adding to the polymerization product an aprotic polar solvent in an amount of 1.0 through 6.0 mol per one mol of the alumin... | 10/24/1978 |
| 4070410 | Method of isolating individual normal alkanes from petroleum stock A method of isolating individual normal alkanes from petroleum stock, wherein the petroleum stock is contacted with crystalline carbamide in the presence of an activator at a temperature which is the upper limit for a given individual normal alkane to be ... | 01/24/1978 |
| 4070409 | Process for recovering anthracene A process for recovering anthracene from crude anthracene, which comprises treatment of crude anthracene with an aprotic bipolar solvent N,N-dimethylacetamide. After such treatment suspension I is obtained which is separated into liquid and solid phases. ... | 01/24/1978 |
| 3953300 | Process for separating a high purity vinyl aromatic hydrocarbon from hydrocarbon mixtures containing the same Styrene of exceptional purity is separated from a mixture of hydrocarbons including it, xylenes, saturated and olefinic hydrocarbons and ethyl benzene by means of a two-step extractive distillation process through the use of a high boiling polar solvent s... | 04/27/1976 |
