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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 |
| 7402720 | Distillation process for removal of methyl acetylene and/or propadiene from an olefin stream The present invention provides a process for removing methyl acetylene and/or propadiene from a propylene stream and/or a butylene stream by two step fractionation. Methyl acetylene and/or propadiene avoids the use of a hydrogenation reactor and makes the methyl ace... | 07/22/2008 |
| 7371309 | Purification of difluoromethane by extractive distillation The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and penta... | 05/13/2008 |
| 7365217 | Oxidation process A process is disclosed for reacting an olefin, hydrogen, and oxygen in a reactor in the presence of an epoxidation catalyst comprising a transition metal zeolite and a noble metal to produce a product stream comprising an epoxide and an alkane. The alkane is separat... | 04/29/2008 |
| 7285187 | Method of purifying propylene oxide A process for purifying propylene oxide characterized by subjecting a liquid reaction mixture containing propylene oxide, and water, hydrocarbons and oxygen-containing organic compounds as impurities obtained by reacting cumene hydroperoxide with propylene to extrac... | 10/23/2007 |
| 7070694 | Purification of fluid compounds utilizing a distillation - membrane separation process Apparatus and processes are disclosed for economical separation of fluid mixtures. Broadly, apparatus of the invention is an integrated fractional distillation and perm-selective membrane separation apparatus. More particularly, the integrated apparatus comprises a ... | 07/04/2006 |
| 7037412 | Method for preparing deodorized N-vinyl-2-pyrrolidone The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by adding to an odorous components-containing liquid having a N-vinyl-2... | 05/02/2006 |
| 6984293 | Azeotropic distillation of cyclic esters of hydroxy organic acids Cyclic esters of hydroxy organic acids can be produced and recovered via azeotropic distillation. In certain embodiments cyclic esters, such as glycolide and lactide, can be produced from a fermentation broth or other feed stream that contains a hydroxy organic acid... | 01/10/2006 |
| 6982026 | Azeotropic distillation process for producing organic acids or organic acid amides Disclosed herein are methods for the recovery of at least one of an organic acid or an organic acid amide, such as a heat stable lactic acid or lactamide, from a feed stream which contains the organic acid and/or organic acid amide. The feed stream is mixed with at ... | 01/03/2006 |
| 6926810 | Process for obtaining an organic acid from an organic acid ammonium salt, an organic acid amide, or an alkylamine organic acid complex Disclosed herein are methods for the recovery of an organic acid, such as a heat stable lactic acid, from a feed stream which contains at least one of an organic acid amide, an organic acid ammonium salt, or an alkylamine-organic acid complex. The feed stream is mix... | 08/09/2005 |
| 6736941 | Process for purifying propylene oxide A process is described for purifying propylene oxide, which includes the step of distilling propylene oxide containing impurities in the presence of a hydrocarbon having 5 carbon atoms or less. According to the present invention, a process is provided for purifying ... | 05/18/2004 |
| 6613197 | Method for isolation of barely volatile organic compounds A method and apparatus for isolation of a barely volatile organic compound in a sample suspected to contain the same, e.g. a dioxin, which includes continuously adding superheated steam and a volatile and hardly water-soluble/water-insoluble solvent to a ... | 09/02/2003 |
| 6500311 | Propylene oxide purification A mixture of propylene oxide and methanol is separated by liquid/liquid extraction using water and a hydrocarbon such as n-octane as extractive solvents.... | 12/31/2002 |
| 6461481 | Process for removing water from organoborane compounds A method of removing water from wet organoborane by dissolving the wet organoborane in an organic solvent in which water is incompletely soluble, decanting any insoluble water, and distilling the organic phase to remove water which may be contained therei... | 10/08/2002 |
| 6458249 | Process for purifying perfluorinated products Nitrogen trifluoride (NF3) containing less than 10 parts-per-million molar impurities, e.g., tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using entraining agents for separating NF3 and P... | 10/01/2002 |
| 6444096 | Process for the recovery and purification of cyclobutanone A process for the recovery and purification of cyclobutanone from a crude product mixture obtained from an oxidation product mixture resulting from the oxidation of cyclobutanol to cyclobutanone in the presence of water. The process provides for the recov... | 09/03/2002 |
| 6383343 | Separation of components from methanol mixtures by extractive distillation A method of separating methanol and acetone, and methanol and methyl acetate involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent. The extractive distillation solvent m... | 05/07/2002 |
| 6375803 | Mechanical vapor recompression separation process A method and apparatus for removing a contaminant from a fluid feed stream containing the contaminant. The method includes the steps of providing a feed stream (10) and heating it in a first step (18) to at least partially remove some of the contaminants ... | 04/23/2002 |
| 6375807 | Separation of ethanol mixtures by extractive distillation A method of separating ethanol and ethyl acetate, and ethanol and water involves distilling a mixture of the components by an extractive distillation process in the presence of an extractive distillation solvent. The extractive distillation solvent may be... | 04/23/2002 |
| 6352618 | Modular solvent recovery device A process is disclosed for manufacturing a concentrated residue from a photopolymer fluid which includes photopolymer and photopolymer solvent. The photopolymer fluid may be derived by chemically etching a photopolymer layer of a printing plate with a sol... | 03/05/2002 |
| 6299736 | Process for recovering γ-butyrolactone from a mixture of heavy organics Gamma-Butyrolactone (GBL) is recovered from a mixture containing GBL and other heavy organics by a process of azeotropic distillation in the presence of a C8-C 10 hydrocarbon as an azeotroping agent, wherein an azeotrope of GBL and t... | 10/09/2001 |
| 6159346 | Inhibition of 141b decomposition Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as dialkylhydroxylamine and/or the use of a vessel made of a nickel alloy.... | 12/12/2000 |
| 6120652 | Method for purifying crude 1,1,1,3,3-pentafluoropropane The invention relates to a method for purifying a crude 1,1,1,3,3-pentafluoropropane (HFC-245fa) containing HFC-245fa and 1-chloro-3,3,3-trifluoro-trans-1-propene (HCFC-1233zd(t)), by distillation. This method is characterized in that the distillation is ... | 09/19/2000 |
| 6066238 | Hydrocarbon separation A process for the separation of propylene from an input stream of C3 hydrocarbons containing propylene and methyl acetylene and/or propadiene and, optionally, C4 and/or higher hydrocarbons is described. The process includes subjecting the input stream to ... | 05/23/2000 |
| 6059933 | Inhibition of 141b decomposition Inhibition of the formation of unsaturated carbon compounds during the heating of 141b involving the addition of various inhibitors such as butylene oxide and/or the use of a vessel made of a nickel alloy.... | 05/09/2000 |
| 6042697 | Separation of 9,11-Diene C18 fatty acid from 10,12-Diene C18 fatty acid by azeotropic distillation 9,11- Diene C18 fatty acid cannot be separated from 10,12-Diene C18 fatty acid by conventional rectification because of the proximity of their boiling points. 9,11-Diene C18 fatty acid can be readily separated from 10,12-Diene fatty acid by azeotropic dis... | 03/28/2000 |
| 6039846 | Separation of 3-methyl-2-pentenal from n-butanol by azeotropic distillation 3-Methyl-2-pentenal cannot be separated from 1-butanol by conventional rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by azeotropic distillation. Effective agents are dimethoxyme... | 03/21/2000 |
| 6024841 | Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by extractive distillation 2-Methyl-1-butanol and 3-methyl-1-butanol are difficult to separate from 1 pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-butanol and 3-methyl-1-butanol can be easily separated from 1-pe... | 02/15/2000 |
| 6024840 | Propylene oxide purification Propylene oxide obtained by an epoxidation process which uses methanol as a solvent may be effectively treated to remove acetaldehyde by subjecting the crude epoxidation reaction product to fractional distillation. The methanol solvent is utilized during ... | 02/15/2000 |
| 5993610 | Separation of ethyl acetate from ethanol by azeotropic distillation Ethyl acetate cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Ethyl acetate is readily separated from ethanol by azeotropic distillation. Effective agents are ethyl ether, methyl formate ... | 11/30/1999 |
| 5964987 | Neutral oil removal from natural cresylic acid mixtures Natural cresylic acid is processed to remove neutral oil impurities by countercurrent liquid/liquid extraction using a heavy phase solvent of a mixture of glycerol and another polyhydric alcohol, preferably triethylene glycol. The light phase solvent is a... | 10/12/1999 |
| 5922175 | Purification of chlorotetraflouroethane by extractive distillation A process for the purification of 1-chloro-1,2,2,2-tetrafluoroethane (F124) containing 1,2-dichlorotetrafluoroethane (F114) and/or 1,1-dichlorotetrafluoroethane (F114a). The F124 to be purified is subjected to extractive distillation, the extractant being... | 07/13/1999 |
| 5908538 | Separation of T-amyl alcohol from 2- methyl-1 -propanol azeotropic distillation 2-Methyl-1-propanol cannot be separated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Methyl-1-propanol is readily separated from t-amyl alcohol by azeotropic distillation. Effective agents are bu... | 06/01/1999 |
| 5904815 | Separation of t-amyl alcohol from n-butanol by azeotropic distillation t-Amyl alcohol cannot be separated from n-butanol by distillation or rectification because of the closeness of their boiling points. t-Amyl alcohol is readily separated from n-butanol by azeotropic distillation. Effective agents are propyl acetate, tetrah... | 05/18/1999 |
| 5897750 | Separation of acetone from isopropanol-water mixtures by extractive distillation Acetone cannot be separated from a mixture of isopropanol and water because of the closeness of their boiling points. Acetone can be easily separated from isopropanol and water by extractive distillation. Effective extractive agents are 1-nitropropane, 3-... | 04/27/1999 |
| 5882485 | Process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures A process for the separation of dimethyl ether and chloromethane in mixtures by two distillation steps. In the first step, the mixture is subjected to an extractive distillation ... | 03/16/1999 |
| 5868908 | Separation of inorganic salts from dimethyl sulfoxide A process for separating inorganic salts from a solution of dimethyl sulfoxide, water and salts including feeding the solution plus a hydrocarbon based oil to a vacuum thin film evaporator. The DMSO and water are vaporized and condensed outside the evapor... | 02/09/1999 |
| 5851362 | Separation of 4-methyl-2-pentanol from 3-methyl-1-butanol by extractive distillation 4-Methyl-2-pentanol cannot be separated from 3-methyl-1-butanol by distillation because of the closeness of their boiling points. 4-Methyl-2-pentanol can be easily separated from 3-methyl-1-butanol by extractive distillation. Effective agents are dodecane... | 12/22/1998 |
| 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 |
| 5834585 | Method for the separation of hexamethylcyclotrisiloxane A method for separating hexamethylcyclotrisiloxane that does not require the use of a distillation set up adapted for use with solids and that collects the hexamethylcyclotrisiloxane in the form of an easy-to-handle solution. The method comprising inducin... | 11/10/1998 |
| 5800681 | Separation of ethanol, isopropanol and water mixtures by extractive distillation Ethanol, isopropanol and water cannot be separated from each other by distillation or rectification because of minimum azeotropes. They are readily separated by extractive distillation. Effective agents are: dimethylsulfoxide for ethanol, phenol for isopr... | 09/01/1998 |
