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| Number | Title | Issue Date |
| 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 |
| 6475347 | High boiling inhibitors for distillable, polymerizable monomers Disclosed herein are compounds of the structure ##STR1## wherein R1, R2, and R3 are organic radicals of C1 to C20, such that the combination of the three contain at least twelve carbon atoms and R | 11/05/2002 |
| 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 |
| 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 |
| 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 |
| 6017423 | Separation of 3-methyl-2-pentenal from N-butanol by extractive distillation 3-Methyl-2-pentenal cannot be separated from n-butanol by conventioal rectification because of the proximity of their boiling points. 3-methyl-2-pentenal can be readily separated from n-butanol by extractive distillation. Effective agents are 1-methyl-2-p... | 01/25/2000 |
| 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 |
| 5968322 | Process for preparing refined acrylic esters A process for preparing refined acrylic esters, the process including steps of distilling an acrylic ester containing stream in the presence of hydroquinone or substituted hydroquinone, at a concentration in the range of 200 to 5000 ppmw, wherein the dist... | 10/19/1999 |
| 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 |
| 5879517 | Method for separating 2-butanol from t-amyl alcohol using certain organic compounds as the agent in extractive distillation 2-Butanol cannot be sparated from t-amyl alcohol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from t-amyl alcohol by extractive distillation. Effective agents are butyl ether, benzyl ace... | 03/09/1999 |
| 5876569 | Separation of methyl ethyl ketone from ethanol by extractive distillation Methyl ethyl ketone cannot be separated from ethanol by distillation or rectification because of the closeness of their boiling points. Methyl ethyl ketone is readily separated from ethanol by extractive distillation. Effective agents are methyl benzoate,... | 03/02/1999 |
| 5873981 | Recovery of anhydrous acids A is a process for removing water from an alkanesulfonic acid such as methanesulfonic acid or ethanesulfonic acid by mixing an azeotropic excess of a phenolic compound with water and the alkanesulfonic acid, then boiling off substantially all of the water... | 02/23/1999 |
| 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 |
| 5830325 | Separating and removing 1, 1, 1-trifluoroethane by using azeotropic distillation The disclosure relates to separating 1,1,1-trifluoroethane (HFC-143a from fluorocarbon impurities by using extractive distillation with an extractive agent comprising an alcohol. Examples of suitable extractive agents comprise at least one member from the... | 11/03/1998 |
| 5824195 | Process for distilling crude acrylic silane solution A process for distilling a crude acrylic silane solution particularly containing impurities in a commercial scale for separating acrylic silane in the presence of a hindered phenol and/or amine as polymerization inhibitor, the process being improved by us... | 10/20/1998 |
| 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 |
| 5795447 | Separation of 2-butanol from isobutanol by extractive distillation 2-Butanol cannot be separated from isobutanol by distillation or rectification because of the closeness of their boiling points. 2-Butanol is readily separated from isobutanol by extractive distillation. Effective agents are propylene glycol propyl ether,... | 08/18/1998 |
| 5789629 | Separating 3-methyl-1-butanol from 1-pentanol using certain organic compounds as the agent in extractive distillation 3-Methyl-1-butanol is difficult to separate from 1-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 2 Methyl-1-butanol can be easily separated from 1-pentanol by extractive distillation. Effective ag... | 08/04/1998 |
| 5779862 | Separation of 2-methyl-1-butanol and 3-methyl-1-butanol from 1-pentanol by azeotropic 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... | 07/14/1998 |
| 5772853 | Separation of 1-propanol from t-amyl alcohol by extractive distillation 1-Propanol and t-amyl alcohol cannot be separated by distillation or rectification because of the closeness of their boiling points. 1-Propanol is readily separated from t-amyl alcohol by extractive distillation. Effective agents are dipentene, amyl aceta... | 06/30/1998 |
| 5723024 | Separation of 2-methyl-1-propanol from 1-butanol by extractive distillation 2-Methyl-1-propanol is difficult to separate from 1-butanol by conventional distillation or rectification because of the proximity of their boiling points. 2-Methyl-1-propanol can be readily separated from 1-butanol by extractive distillation. Effective a... | 03/03/1998 |
| 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 |
| 5709781 | Separation of 1-butanol from 2-pentanol by extractive distillation 1-Butanol is difficult to separate from 2-pentanol by conventional distillation or rectification because of the proximity of their boiling points. 1-Butanol can be easily separated from 2-pentanol by extractive distillation. Effective agents are anisole, ... | 01/20/1998 |
| 5705038 | Separation of phellandrene from limonene by extractive distillation Phellandrene is difficult to separate from limonene by conventional distillation or rectification because of the proximity of their boiling points. Phellandreneecan be readily separated from limonene by extractive distillation. Effective agents are o-cres... | 01/06/1998 |
| 5693194 | Separation of butyraldehyde from ethanol by extractive distillation Butyraldehyde cannot be separated from ethanol by conventional distillation or rectification because they form a minimum boiling azeotrope. Butyraldehyde can be readily separated from ethanol by extractive distillation. Effective agents are 2-propanol, m-... | 12/02/1997 |
| 5659095 | Composition for inhibiting the polymerization of aromatic vinyl monomers A polymerization inhibitor composition for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures comprising: (a) a benzofuroxan derivative of the formula ##STR1## wherein R is C1 -C4 alkyl or alkoxy; R | 08/19/1997 |
| 5648573 | Compositions and methods for inhibiting vinyl aromatic monomer polymerization The polymerization of a vinyl aromatic monomer such as styrene is inhibited by the addition of a composition of a benzoquinone derivative and a hydroxylamine compound.... | 07/15/1997 |
| 5602294 | Separation of o-xylene from p-xylene and m-xylene by extractive 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 extractive distillation. Ef... | 02/11/1997 |
| 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 |
| 5580427 | Separation of butyraldehyde from ethanol by azeotropic distillation Butyraldehyde cannot be separated from ethanol by conventional distillation or rectification because they form a minimum boiling azeotrope. Butyraldehyde can be readily separated from ethanol by azeotropic distillation. Effective agents are ethyl formate,... | 12/03/1996 |
| 5562863 | Methods and compositions for inhibiting vinyl aromatic monomer polymerization Vinyl aromatic monomer polymerization methods utilizing a composition of 2,6-di-tert-butyl-4-methylphenol and a substituted benzoquinonediimide compound are disclosed. Preferably, the composition is employed in an amount of 1 part to 10,000 parts per mill... | 10/08/1996 |
| 5470443 | Separation of isopropanol from 2-butanone by extractive distillation Isopropanol is difficult to separate from 2-butanone by conventional distillation or rectification because of the proximity of their boiling points. Isopropanol can be readily separated from 2-butanone by extractive distillation. Effective agents are o-cr... | 11/28/1995 |
| 5470440 | Method for inhibiting vinyl aromatic monomer polymerization Vinyl aromatic monomer polymerization methods utilizing a composition of 2,6-di-tert-butyl-4-methylphenol and a substituted benzoquinonediimide compound are disclosed. Preferably, the composition is employed in an amount of 1 part to 10,000 parts per mill... | 11/28/1995 |
| 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 |
| 5453166 | Separation of ethanol from 2-butanone by extractive distillation Ethanol is impossible to separate from 2-butanone by conventional distillation or rectification because of the minimum boiling azeotrope between these two. Ethanol can be readily separated from 2-butanone by extractive distillation. Effective agents are d... | 09/26/1995 |
| 5445716 | Separation of ethanol from isopropanol by extractive distillation Ethanol is difficult to separate from isopropanol by conventional distillation or rectification because of the proximity of their boiling points. Ethanol can be readily separated from isopropanol by extractive distillation. Effective agents are dipentene,... | 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 |
