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| Number | Title | Issue Date |
| 8075742 | Apparatus and process for the separation and purification of ideal and non-ideal refrigerant mixtures An apparatus and process for the separation of refrigerant mixtures is provided. The apparatus includes a first distillation column, a first condenser, and a first collection vessel. The apparatus also includes a sorter vessel that includes a sorter agent, wherein t... | 12/13/2011 |
| 7699962 | Processes utilizing extractive distillation The invention relates to methods for separating mixture components such as reactor effluent components. In particular, the invention relates to the use of an extractive agent such as a hydrocarbon in an extractive distillation process to separate monomers such as a ... | 04/20/2010 |
| 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 |
| 7273835 | Azeotrope-like compositions of difluoromethane The invention relates to azeotropic and azeotrope-like mixtures of HFC-32 and HCl or a mixture of HCl and Cl2, and a process for separating the azeotrope-like mixtures. ... | 09/25/2007 |
| 7241928 | Process for the manufacture of halocarbons and selected compounds and azeotropes with HF A liquid phase process is disclosed for producing halogenated alkane adducts of the formula CAR1R2CBR3R4 (where A, B, R1, R2, R3, and R4 are as defined in the specification) whic... | 07/10/2007 |
| 7207494 | Laser etched security features for identification documents and methods of making same The invention provides a method of producing a security feature in an identification document. A core including a top surface and a bottom surface is provided. A first laminate is laminated in contact with the top surface. A second laminate is laminated in contact w... | 04/24/2007 |
| 7189311 | Purification of difluoromethane A method for separating difluoromethane from a mixture of difluoromethane and at least one impurity, the method involving extractively distilling the mixture using dichloromethane as an extractive agent to recover a product stream of purified difluoromethane having ... | 03/13/2007 |
| 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 |
| 7153397 | Process for the purification of fluoromethyl hexafluoroisopropyl ether A process for the purification of fluoromethyl hexafluoroisopropyl ether which comprises contacting a crude composition comprising fluoromethyl hexafluoroisopropyl ether and hexafluoroisopropyl alcohol with a modifier in the presence of which the vapor pressure of t... | 12/26/2006 |
| 7074434 | Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane... | 07/11/2006 |
| 7060165 | Processes for purification and production of fluorocarbons The present invention involves processes that utilize an olefinic compound, in particular, hexafluoropropene (HFP) or chlorotrifluoroethene (CFC-1113) as extracting agents in the purification of pentafluoroethane (HFC-125). These processes can utilize recovered HFP ... | 06/13/2006 |
| 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 |
| 6919015 | Process for manufacturing fluoroolefins A process for manufacturing fluoroolefins comprising perfluorinating a starting material comprising at least one carbon-bonded hydrogen by electrochemical fluorination, dissociating this separated effluent in a pyrolysis, quenching and separating the effluent to yie... | 07/19/2005 |
| 6863780 | Process of separating/purifying pentafluoropropane There is provided an azeotropic mixture having 1,1,1,3,3-pentafluoropropane and hydrogen fluoride. Further, there is provided a process of separating/purifying R-245fa and/or HF from a mixture of R-245fa and HF wherein the mixture of 1,1,1,3,3-pentafluoropropane and... | 03/08/2005 |
| 6849163 | Method for producing tetrafluoroethylene There is provided a process for recovering tetrafluoroethylene wherein an amount of energy required to obtain TFE is reduced. In the process for producing a TFE mixture as an intended mixture which contains TFE at a higher concentration from a raw material mi... | 02/01/2005 |
| 6794470 | Process for producing a tetrafluoroethylene polymer A tetrafluoroethylene polymer is produced by polymerizing tetrafluoroethylene in the presence of an aqueous medium and a polymerization initiator, wherein the content of impurities (e.g. a saturated compound such as CH2F2 or CHF3 and... | 09/21/2004 |
| 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 |
| 6755942 | Process for the manufacture of halocarbons and selected compounds and azeotropes with HF The invention relates to azeotropic compositions of halogenated propanes with HF. ... | 06/29/2004 |
| 6676809 | Process for removal of hydrogen fluoride Hydrogen fluoride is effectively removed from a mixture of hydrogen fluoride, dichloromethane, chlorofluoromethane and/or difluoromethane by distilling the mixture so that two-component azeotropic mixtures of hydrogen fluoride and dichloromethane, hydroge... | 01/13/2004 |
| 6660130 | Apparatus for vaporization of liquids Prior to carrying out a gaseous phase chemical reaction, a liquid phase organic compound which is prone to degrade is vaporized at elevated pressures with the aid of a second compound which together with the organic compound produces a mixture having a bo... | 12/09/2003 |
| 6649205 | Solvent extraction There is described a process for the extraction of at least one relatively polar component from a material which may be naturally occuring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comp... | 11/18/2003 |
| 6638987 | Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and water This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and water that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polym... | 10/28/2003 |
| 6635686 | Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and methylbutane This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and 2-methylbutane that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents ... | 10/21/2003 |
| 6572831 | Materials treatment A material contaminated with a solvent is treated with a hydrofluorocarbon to remove the contaminant. The hydrofluorocarbon can be tetrafluoroethane.... | 06/03/2003 |
| 6548720 | Process for the manufacture of 1,1,1,3,3-pentafluoropropene, 2-chloro-pentafluoropropene and compositions comprising saturated derivatives thereof A process is disclosed for producing the pentfluropropenes of the formula CF3 CX.dbd.CF2, where X is H or Cl. The process involves hydrodehalogenating CF3 CCl2 CF3 with hydrogen at an elevated tempera... | 04/15/2003 |
| 6527917 | Process for preparing pentafluoroethane A method for efficiently separating pentafluoroethane (HFC-125) from a mixture thereof with chloropentafluoroethane (CFC-115). This method is performed by subjecting a mixture (2) of HFC-125 (6) and CFC-115 (4) to extractive distillation (1) to give highl... | 03/04/2003 |
| 6488817 | Purification of hydrofluorocarbons A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated... | 12/03/2002 |
| 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 |
| 6455087 | Solvent extraction There is described a process for the extraction of a least one relatively polar component form a material which may be naturally occurring or a synthetic mixture, the process comprising the steps of: (a) contacting the material with a solvent mixture comp... | 09/24/2002 |
| 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 |
| 6417413 | Process for the preparation of halogenated ethanes A process for preparing halogenated ethanes, particularly pentafluoroethane, from a mixture produced by the reaction of perchloroethylene, hydrogen fluoride and a recycle stream. The preferred process utilizes phase separation techniques to ensure that le... | 07/09/2002 |
| 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 |
| 6376727 | Processes for the manufacture of 1,1,1,3,3-pentafluoropropene, 2-chloro-pentafluoropropene and compositions comprising saturated derivatives thereof Disclosed are azeotropic compositions comprising CF3 CHFCF3 and HF. Also disclosed are compositions and a process for producing compositions comprising (c1) CF3 CHFCF3, CF3 CH2 CF3 | 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 |
| 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 |
| 6221830 | Purification process for hexafluoroethane products The disclosure relates to removing impurities from hexafluoroethane (CF3 CF3), also known as Perfluorocarbon 116 (PFC-116) or Fluorocarbon 116 (FC-116), by using azeotropic distillation such that an overhead product consisting essent... | 04/24/2001 |
| 6156161 | Extractive distillation process for separating difluoromethane and pentafluoroethane using methylene chloride A process is disclosed for removing chloropentafluoroethane (CFC-115) from a mixture comprising CFC-115, difluoromethane (HFC-32), pentafluoroethane (HFC-125), or from mixtures of these compounds, by azeotropic or extractive distillation.... | 12/05/2000 |
| 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 |
| 6099694 | Azeotrope-like compositions of difluoromethane and chlorine The invention relates to an improvement in a process in which chlorine and difluoromethane are present in a distillation column, for example, a fluorination reaction. By controlling the chlorine feed such that the concentration of chlorine relative to dif... | 08/08/2000 |
| 6043063 | Methods of PHA extraction and recovery using non-halogenated solvents Polyhydroxyalkanoate (PHA) polyester is extracted from biomass by dissolving the PHA in a non-halogenated solvent which comprises a PHA-good solvent or a mixture thereof. Suitable PHA-good solvents can be selected from the disclosed alcohols, esters, amid... | 03/28/2000 |
