Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7531067 | Process for purification of 2-chloro-5-chloromethyl-1,3-thiazole The present invention provides a process for purifying 2-chloro-5-chloromethyl-1,3-thiazole represented by the formula (I): characterized in that a crude 2-chloro-5-chloromethyl-1,3-thiazole represented by the formula (I) i... | 05/12/2009 |
| 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 |
| 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 |
| 7141641 | Method and apparatus for production of alkyl aryl ether and diaryl carbonate A method and apparatus for continuously producing an alkyl aryl ether and a diaryl carbonate by reacting a dialkyl carbonate and an aromatic alcohol in presence of a transesterification catalyst. ... | 11/28/2006 |
| 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 |
| 7029707 | Method of producing a processed kava product having an altered kavalactone distribution and processed kava products produced using the same A method of producing a processed kava product involves using an extraction solvent, such as liquid CO2, to preferentially extract different kavalactones from the source material at different rates. By controlling the extraction parameters and stopping th... | 04/18/2006 |
| 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 |
| 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 |
| 6958107 | Cyclonic evaporator A method and apparatus for separating the components of a feed material prior to or simultaneously with at least partially vaporizing one of the components is described. The apparatus comprises at least one inlet (8) for admitting the feed material (10... | 10/25/2005 |
| 6955744 | Method for purifying 2-chloro-5-chloromethylthiazole The present invention relates to a process for the preparation of pure 2-chloro-5 -chloromethylthiazole by distillation in the presence of oligomeric polyethers. ... | 10/18/2005 |
| 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 |
| 6818121 | Production process of indene Indene is produced from an indene-containing coal tar distillate by adding a glycol to the indene-containing coal tar distillate and then conducting azeotropic distillation to obtain an indene fraction while eliminating benzonitrile from the indene-containing coal t... | 11/16/2004 |
| 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 |
| 6582565 | Recovery of 3,4-epoxy-1-butene by extractive distillation Disclosed is a process for the recovery and purification of 3,4-epoxy-1-butene (epoxybutene) from mixtures comprising epoxybutene and aliphatic and aromatic hydrocarbons containing five to seven carbon atoms having boiling points between about 20° C. and... | 06/24/2003 |
| 6559248 | Process of removing contaminants from an olefin stream using extractive distillation Disclosed is a method of purifying olefin containing oxygenate contaminants. The method incorporates the use of extractive distillation. Under the appropriate conditions, olefins containing very low levels of oxygenate contaminants can be recovered.... | 05/06/2003 |
| 6551502 | Process of removing sulfur compounds from gasoline A process for the removal of sulfur compounds from a hydrocarbon stream is disclosed. In a preferred embodiment, the process includes extractive distillation of a gasoline stream from a fluid catalytic cracker to reject olefins to a raffinate stream and s... | 04/22/2003 |
| 6531108 | Process for producing free hydroxylamine aqueous solution This invention provides a highly pure and highly concentrated free hydroxylamine aqueous solution substantially not containing any salt or organic substance. This invention is a process for obtaining a free hydroxylamine aqueous solution, comprising the s... | 03/11/2003 |
| 6465665 | High efficiency process for the recovery of the high pure sterols A high efficiency continuous process for the recovering high purity sterol mixtures from mixtures of neutral compounds obtained form black liquor soap skimings of the cellulose pulping industry or from tall oil pitch comprising the steps of distillation, ... | 10/15/2002 |
| 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 |
| 6359155 | Process for the preparation of 3-hydroxytetrahydrofuran An industrial advantage process for producing high-purity 3-hydroxytetrahydrofuran easily and simply, which comprises reducing a 4-halo-3-hydroxybutyric acid ester (1) with a boron hydride compound and/or an aluminum hydride compound as a reducing agent i... | 03/19/2002 |
| 6358372 | Method of reducing formation of precipitates in solvent recovery system A method of removing at least one inert reaction diluent and/or wash solvent from a waste stream from a catalyst precursor production unit is disclosed, where the waste stream includes at least one reaction diluent or wash solvent, at least one titanium a... | 03/19/2002 |
| 6315869 | Process for purification of perfluorovinyl ethers A perfluorovinyl ether of the formula: RfO(CF2 CFXO)n CF.dbd.CF2 (1) in which Rf is a perfluoralkyl group, X is a fluorine atom or a trifluoromethyl group, and n is a number of 0 to 20 containing impurities is purified by remo... | 11/13/2001 |
| 6315868 | Method of separating dimethyl carbonate and methanol A method of separating methanol and dimethyl carbonate in a distillation column through extractive distillation. The extractive distillation is conducted in the presence of an extractive distillation agent which modifies the azeotropic behavior of the dim... | 11/13/2001 |
| 6224781 | Compositions comprising hydrofluorocarbons and their manufacture A process is disclosed for producing compositions including (a) a compound selected from the group consisting of CHF2 CF3, CHF2 CHF2, CH2 FCF3, CH3 CF3, CH3 CHF | 05/01/2001 |
| 6197163 | Process for removing impurities from petroleum products The impurity content, e.g. propionitrile, in a fraction containing C5 or C6 tertiary olefins obtained by cracking hydrocarbons is reduced by distilling with an alkanol and removing the impurity as a higher boiling point fraction.... | 03/06/2001 |
| 6179967 | Purification process of pentrafluoroethane A purification process of pentafluoroethane from a crude pentafluoroethane containing chloropentafluoroethane as a by-product by extractive distillation using an extracting reagent having a standard boiling point of from -10° C. to 100° C. and being sel... | 01/30/2001 |
| 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 |
| 6093855 | Separation of the divinyl ether of diethylene glycol or triethylene glycol from the monovinyl ether of the corresponding oliogethylene glycol The divinyl ethers of diethylene glycol or triethylene glycol are separated from the monovinyl ether of the corresponding oligoethylene glycol by distillation, a metal hydroxide being added to the vinyl ether mixture.... | 07/25/2000 |
| 6045808 | Method for removing high boiling solvents from drug formulations by vacuum drying A method for removing a high boiling solvent from a pharmaceutical composition dissolved in the high boiling solvent comprising adding a low boiling co-solvent to the solution to form a mixture of the high boiling solvent and the low boiling co-solvent, a... | 04/04/2000 |
| 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 |
| 6015875 | Process for making acetals Acetals are produced from the reaction of aldehydes and alcohols, e.g. methylal by the reaction of methanol and formaldehyde, by the reaction in a reaction distillation column of the alcohol and aldehyde in the presence of a catalyst and the concurrent fr... | 01/18/2000 |
| 6004434 | Method of recycling cleaning solvent A method of treating cleaning solvent used to clean mechanical parts. The method includes adding to the cleaning solvent a treating composition selected from the group of C5 -C14 alcohols, C2 -C8 dials, C10... | 12/21/1999 |
| 6004435 | Separation of cumene from 3-ethyl toluene by azeotropic distillation Cumene cannot be separated from 3-ethyl toulene by distillation because of the proximity of their boiling points. They are readily separated by azeotropic distillation. Effective agents are methyl salicylate, diethylene glycol butyl ether and 3-nitrotolue... | 12/21/1999 |
| 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 |
| 5961789 | Separation of t-amyl alcohol from n-butanol by extractive 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 extractive distillation. Effective agents are dimethylsulfoxide, N.N... | 10/05/1999 |
| 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 |
