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| Number | Title | Issue Date |
| 8083903 | Process for producing allyl alcohol An azeotropic distillation method, comprising a reaction step, a distillation step for separating and refining a reaction product, and a recovery step for collecting a reactant after the distillation step; wherein at least one component constituting the reactant in ... | 12/27/2011 |
| 7338579 | Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water, and methanol by distilling in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product contains substantially... | 03/04/2008 |
| 7311807 | Process for the separation of mixtures containing m-and p-dichlorobenzene A process for the separation of dichlorobenzene mixtures containing m- and p-dichlorobenzene in which: (i) the mixture is as an extracting agent contacted with a phosphoric ester of the general formula (I) as an extracting agent | 12/25/2007 |
| 7306705 | Method for dehydrating composition comprising lithium bis(pentafluoroethanesulfonyl)imide A method for dehydrating an aqueous composition comprising lithium bis(pentafluoroethanesulfonyl)imide and at least one organic solvent, wherein a part of solvent is distilled off by distillation. ... | 12/11/2007 |
| 7241365 | Material for a facility for the production of anhydrous formic acid The invention relates to an apparatus and a process for the preparation of anhydrous or substantially anhydrous formic acid. This apparatus is constructed partly or entirely of substantially zirconium-free materials. The extractant employed is a liquid of the genera... | 07/10/2007 |
| 7235183 | Glycerine foots salt separation system The present invention provides a method and apparatus for the recovery of salt from a glycerine process, allowing the salt to be used in a brine solution. A salt settling tank is positioned inline between the foots from a crude still bottom and a foot still. Salt se... | 06/26/2007 |
| 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 |
| 7048835 | System and method for acetic acid recovery during terephthalic acid production A distillation system and method for recovering acetic acid from a feed stream containing acetic acid and water stream generated during terephthalic acid production. The invention includes a dehydration column utilizing azeotropic distillation to recover the acetic ... | 05/23/2006 |
| 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 |
| 6787001 | Method for distilling (meth) acrylic acid solution A method for distilling a raw material liquid containing (meth)acrylic acid substantially free from azeotropic solvents, collected with a collection agent from a mixed gas obtained by gas phase catalytic oxidation reactions which includes feeding to a distillation c... | 09/07/2004 |
| 6673959 | Preparation of carboxylic esters catalyzed by a sulphonic acid The preparation of a carboxylic ester by direct reaction of a carboxylic acid and an alcohol catalyzed by a sulphonic acid R--SO3 H is carried out in the presence of a solid comprising tertiary amine functions.... | 01/06/2004 |
| 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 |
| 6494996 | Process for removing water from aqueous methanol A process for separating water from methanol in an aqueous methanol initial mixture, including subjecting said mixture to azeotropic distillation in the presence of sufficient added methyl acrylate to form an azeotrope with most of the methanol in said in... | 12/17/2002 |
| 6478929 | Dewatering process A formaldehyde-containing product is separated from a formalin solution containing formaldehyde, water and methanol by distilling the solution in the presence of a water entraining compound, especially methyl propionate or methyl methacrylate. The product... | 11/12/2002 |
| 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 |
| 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 |
| 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 |
| 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 |
| 6391161 | Method for reducing the chlorine content of low molecular weight isocyanates An organic isocyanate or mixture of isocyanates is treated with at least one high molecular weight ester of phosphoric acid corresponding to a specified formula to remove chlorine compounds. The isocyanates which are purified in this manner are useful for... | 05/21/2002 |
| 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 |
| 6207022 | Purification of crude (meth) acrylic acid Crude (meth)acrylic acid is purified by a process in which a primary amine compound and an organic sulfonic acid are added to the crude (meth)acrylic acid and the latter is then worked up by distillation.... | 03/27/2001 |
| 6191285 | Process for the preparation of ketorolac tromethamine The present invention provides an improved process for producing ketorolac tromethamine. The preferred method utilizes a three-part solvent system, comprising isopropanol, ethyl acetate and water.... | 02/20/2001 |
| 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 |
| 6139693 | Method for obtaining hexamethylene diamine from mixtures containing hexamethylene diamine A process for recovering hexamethylenediamine (I) from a mixture (II) including (I) hexamethylenediamine, (III) hexamethyleneimine, (IV) a compound selected from 2-aminomethylcyclopentylamine and 1,2-diaminocyclohexane, (V) an imine, (VI) adiponitrile and 6-am... | 10/31/2000 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5980696 | Dehydration of acetic acid by azeotropic distillation in the production of an aromatic acid An improved process for preparing an aromatic dicarboxylic acid wherein the improvement resides in dehydrating and recovering solvent from a feed stream having from 20% to 40% by weight water via azeotropic distillation with organic phase reflux using an ... | 11/09/1999 |
| 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 |
| 5972173 | Allyl alcohol purification Mixtures of allyl alcohol and n-propanol are separated by extractive distillation using propylene carbonate, N-methyl pyrrolidone or gamma-butyrolactone extractive distillation solvent.... | 10/26/1999 |
| 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 |
| 5951828 | Continuous distillation of thermolabile monomers In a process for the continuous distillation of thermolabile monomers under reduced pressure in the presence of formamide in a column, the thermolabile monomers are continuously fed in liquid form, separately from formamide, into the lower part of the column u... | 09/14/1999 |
| 5928478 | Separation of linoleic acid from linolenic acid by azeotropic distillation Linoleic acid cannot be separated from linolenic acid by distillation or rectification because of the closeness of their boiling points. Linoleic acid is readily separated from linolenic acid by azeotropic distillation. Effective agents are nonane, dimeth... | 07/27/1999 |
| 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 |
