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| Number | Title | Issue Date |
| 8088258 | Method for purifying and separating a krypton-xenon mixture by rectification and a device for carrying out said method The invention relates to cryogenic engineering, in particular to purifying krypton-xenon mixture and is usable in the chemical and oil-and-gas industries. The inventive method comprises purifying and separating the mixture in rectification columns, wherein coolant i... | 01/03/2012 |
| 8016981 | Method and apparatus for purifying and separating a heavy component concentrate along with obtaining light gas isotopes The claimed method and apparatus relate to cryogenic technology, particularly to purifying and separating by distillation a target heavy component concentrate thereby obtaining target components, e.g., krypton and xenon, and isotopes of light gases such as deuterium... | 09/13/2011 |
| 7384519 | Process for the purification of pharmaceutical grade HFC-134a and polymer grade HCFC-22 A method for the purification of pharmaceutical grade 1,1,1,2-tetrafluoroethane (HFC-134a) and polymer grade chlorodifluoromethane (HCFC-22) by contacting a mixture containing 1,1,1,2-tetrafluoroethane or chlorodifluoromethane and methyl chloride with a zeoli... | 06/10/2008 |
| 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 |
| 7368039 | Distiller employing cyclical evaporation-surface wetting A distillation unit (10) employs a rotary heat exchanger (32) forming a multiplicity of evaporation chambers (56) into which a liquid to be purified is sprayed for evaporation. Spray arms (58) spray at a steady rate into all of the evapor... | 05/06/2008 |
| 7357849 | Method and system for separating solids from liquids A method and system for treating feedwater includes evaporating a portion of the feedwater in a first evaporation chamber so as to separate water vapor from the remaining feedwater. Droplets of the remaining feedwater are dispersed into a stream of hot air produced ... | 04/15/2008 |
| 7311813 | Distillation sequence for the purification and recovery of hydrocarbons This invention is an improved distillation sequence for the separation and purification of ethylene from a cracked gas. A hydrocarbon feed enters a C2 distributor column. The top of the C2 distributor column is thermally coupled to an ethylene distributor column, an... | 12/25/2007 |
| 7301056 | Process for the separation of phenol from phenol-containing streams from the preparation of Bisphenol A A continuous process for the separation of phenol is disclosed. The process includes (a) feeding a stream of material, produced while preparing bisphenol A by reacting phenol with acetone, into a distillation column containing at least 5 theoretical separation stage... | 11/27/2007 |
| 7297237 | Method and device for separation and concentration by evaporation of mixture with separation factor of approx. 1 By using a dephlegmator which conducts distillation concurrently with heat exchange within at least one distillation column, or a portion of one distillation column, of a distillation cascade, the quantity of liquid holdup within the distillation apparatus is reduce... | 11/20/2007 |
| 7294240 | Method for producing (meth)acrylic acid esters Basic (meth)acrylates IV are prepared by transesterification of alkyl (meth)acrylates I in the presence of a catalyst and working-up of the reaction mixture by distillation, by a process in which a gas or gas mixture which is inert under the reaction conditions is p... | 11/13/2007 |
| 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 |
| 7192987 | Processes for making methanol streams and uses for the streams This invention is directed to processes (i.e., methods) for making methanol compositions, and to processes (i.e., methods) of using the methanol compositions. The methanol compositions contain ethanol and are particularly suitable for contacting with an olefin formi... | 03/20/2007 |
| 7182841 | Purification of solvents used for the purification of alkylene oxide This invention concerns a process for removing carbonyl-containing impurities from impure extractive distillation solvent such as a glycol, comprising: contacting the impure extractive distillation solvent with an acidic ion exchange resin. The purified extractive d... | 02/27/2007 |
| 7132051 | Liquid-liquid extraction of polar organic substances from their aqueous solutions with fluorinated extracting liquids A liquid-liquid extraction process of ketones, alcohols, aldehydes, alkyl esters of carboxylic acids, carboxylic acids, ethers, amines and heterocyclic compounds, from their aqueous solutions, comprising the addition under stirring to said aqueous solutions of a flu... | 11/07/2006 |
| 7118098 | Hydraulically sealed crossflow mass transfer tray A hydraulically sealed crossflow mass transfer tray, separating columns which contain the hydraulically sealed crossflow mass transfer tray and the use of such separating columns for thermal separating processes. ... | 10/10/2006 |
| 7118653 | Process for the purification of mixtures of toluenediisocyanate incorporating a dividing-wall distillation column Process for the purification of toluenediisocyanate from a crude distillation feed which includes toluenediisocyanate, an organic solvent and less than 2% by weight phosgene by separating the crude distillation feed in a dividing-wall distillation column into at lea... | 10/10/2006 |
| 7108770 | Process for the purification of toluene diisocyanate incorporating a dividing-wall distillation column for the final purification Toluene diisocyanate is recovered from a crude distillation feed containing less than 2% by weight of phosgene by (a) fractionating the crude distillation feed containing less than 2% by weight of phosgene to remove the solvent and optionally the reaction res... | 09/19/2006 |
| 7078573 | Dewatering of circulatory flows in the production of bisphenol A A process for producing bisphenol A is disclosed. The process entails a) reacting phenol with acetone in the presence of an acidic catalyst to form a reaction mixture that includes bisphenol A and water, and b) removing water from the reaction mixture by distillatio... | 07/18/2006 |
| 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 |
| 7067044 | Multi-unit, distributive, regenerable, in situ desalination method Cultivated field water is desalinated by a series of independent units that float on the water surface, taking up the saline water with a wick, evaporating the water from the wick in desalinating relation by concentrating incident solar radiation with a combination ... | 06/27/2006 |
| 7041199 | Process and device for hydrolytically obtaining a carboxylic acid alcohol from the corresponding carboxylate A process and a device for the catalytic hydrolysis of a carboxylate, e.g., methyl acetate, ethyl acetate, i- or n-propyl acetate, i- or n-butyl acetate, allyl acetate and methyl formate, into the corresponding carboxylic acid and alcohol, by a combination of a pre-... | 05/09/2006 |
| 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 |
| 6869501 | Continuous process for controlled concentration of colloidal solutions A process for evaporating a portion of a colloidal solution, said process including: a) passing a colloidal solution, said colloidal solution including particles in a liquid medium, wherein at least a portion of said liquid medium includes at least one volatile comp... | 03/22/2005 |
| 6835288 | Method for preventing undesired polymerization in a mixture of substances containing ethylenically unsaturated compounds A process for preventing undesired polymerization is conducted by maintaining an effective concentration of a stabilizer which comprises N-oxyl radicals in a mixture containing ethylenically unsaturated compounds, wherein (i) an el... | 12/28/2004 |
| 6833056 | Desalination method and desalination apparatus A desalination apparatus capable of obtaining fresh water stably at low cost by utilizing low-temperature waste, wherein the desalination apparatus including a heat exchanger 92 cooperating with an evaporation can 60 so as to subject a low-temperature ... | 12/21/2004 |
| 6797125 | Method of treating condensates The present invention relates to a method of treating condensates containing compounds, which are more volatile than water, in an evaporation plant, where liquid, such as effluent liquid from a pulp or paper mill is evaporated in multiple effects and where condensat... | 09/28/2004 |
| 6790319 | Method for recovering titanium compound, process for preparing titanium halide, and process for preparing catalyst for polymer production A method for recovering a titanium compound includes bringing a waste solution containing a titanium alkoxide into contact with a halogenating agent to convert at least a part of the titanium alkoxide to a titanium halide, and then distilling the solution containing... | 09/14/2004 |
| 6689251 | Cycled-concentration distiller A distiller (10) that employs a rotary heat exchanger (32) introduces water to be evaporated into evaporation chambers (56). During most of its operation, it collects the water that has passed through the evaporation chamber (56) without evaporating, and ... | 02/10/2004 |
| 6551466 | Multiple effect distillation process with reduced fouling 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 and heating it in a first step to at least partially remove some of the contaminants and recove... | 04/22/2003 |
| 6540881 | Method for refining (meth)acrylic acid This invention relates to a method for preventing (meth)acrylic acid from polymerizing during the course of distillation. The method provides for refining (meth)acrylic acid by a procedure including the steps of feeding a mixed gas obtained by catalytic g... | 04/01/2003 |
| 6471823 | Use of pressure and temperature measurements to infer process variables and to monitor equipment conditions and infer process efficiency in a multi-effect evaporator system The invention disclosed herein provides methods for monitoring performance and efficiency for multi-effect evaporator systems. The invention also provides methods for monitoring the nonvolatile content of liquid products by determination of a boiling poin... | 10/29/2002 |
| 6468399 | Process for isolating cyclopentane and/or cyclopentene Cyclopentane and/or cyclopentene and, if desired, isopentane can be obtained by distillative separation from a pre-benzene fraction or a C5 fraction which has in each case being partially hydrogenated to remove acetylene compounds and diolefins... | 10/22/2002 |
| 6464839 | Beta-elemene, method to prepare the same and uses thereof This invention provides an anti-cancer composition of high purity beta-elemene extracted from plant sources. This invention also provides for the use of the composition as well as a low cost method to prepare it by multiple passes through the precision di... | 10/15/2002 |
| 6462210 | Fractionation process for the unsaponifiable material derived from black-liquor soaps The present invention relates to a fractionation process of the unsaponifiable material derived from black-liquor soaps of the cellulose industry. Through this procedure fractions that essentially contain free sterols, fatty alcohols, sterol esters and fa... | 10/08/2002 |
| 6461583 | Method for enrichment of heavy component of oxygen isotopes A method and apparatus for enrichment of heavy oxygen isotopes is provided wherein an oxygen starting material which contains heavy oxygen isotopes is enriched in at least one of oxygen molecule 16 O17 O, 16 O18... | 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 |
| 6436243 | Process for recovering N-vinyl-2-pyrrolidone A process for recovering N-vinyl-2-pyrrolidone is provided which allows to recover N-vinyl-2-pyrrolidone efficiently and steadily and in high purity by continuous distillation from a mixed liquid containing N-vinyl-2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrr... | 08/20/2002 |
| 6423189 | Process for the preparation of 1,3-dichloropropane A process for the preparation of 1,3-dichloropropane by reacting bis(3-hydroxypropyl)ether with hydrogen chloride, optionally in the presence of tertiary basic nitrogen compounds or other tertiary aliphatic bases as catalysts, distilling off the 1,3-dichl... | 07/23/2002 |
| 6402897 | Apparatus for distilling, heating and storing liquid A combination liquid distillation unit and heater, where the distilled liquid is heated to an elevated temperature to effect distillation, and then stored and maintained at an elevated temperature in a hot liquid tank. Thermal communication between the di... | 06/11/2002 |
| 6390454 | Multiple downcomer fractionation trays with liquid distribution devices on ends of downcomers Liquid distributors collect liquid falling out of the spout group at the ends of a downcomer of a fractionation tray. The devices then distribute the liquid against the wall of the column or onto the decking of the next lower tray so to cause uniform liqu... | 05/21/2002 |
