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| Number | Title | Issue Date |
| 8058482 | Method for the preparation of sevoflurane A method for the preparation of (CF3)2CHOCH2F (Sevoflurane) is presented, which comprises providing a mixture of (CF3)2CHOCH2Cl, potassium fluoride, water, and a phase transfer catalyst and reacting t... | 11/15/2011 |
| 8044247 | Process for the preparation of fluoromethyl 2,2,2-trifluoro-1-(trifluoromethyl) ethyl ether The present invention refers to a process for the preparation of fluoromethyl 2,2,2-trifluoro-1-(trifluoromethyl)ethyl ether (sevoflurane) which includes a step that consists of reacting hexafluoroisopropanol with a formaldehyde equivalent selected among paraformald... | 10/25/2011 |
| 8039678 | Process for the preparation of chloromethyl 2,2,2-trifluoro-1-(trifluoromethyl) ethyl ether The present invention refers to a process for the preparation of chloromethyl 2,2,2-trifluoro-1-(trifluoromethyl) ethyl ether (sevochlorane), which consists of reacting hexafluoroisopropanol with: a formaldehyde equivalent selected between paraformaldehyde or 1,3,5-... | 10/18/2011 |
| 7750192 | Purification of Fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether (sevoflurane) Crude sevoflurane product comprising unacceptably high levels of HFIP can be purified by combining the crude sevoflurane product with sufficient water to produce a multiphase mixture, fractionally distilling the multiphase mixture, removing sevoflurane from the dist... | 07/06/2010 |
| 7732647 | Process for the purification of fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether (sevoflurane) A process for purifying crude fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether (sevoflurane). The crude sevoflurane is repeatedly washed with water under conditions and for a time sufficient to reduce the level of 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) to no mor... | 06/08/2010 |
| 7375254 | Process for recovery of 1,1,1,3,3,3-hexafluoroisopropanol from the waste stream of sevoflurane synthesis Provided is a process of obtaining 1,1,1,3,3,3-hexafluoro-2-propanol (“HFIP”) from a composition comprising an HFIP hydrolyzable precursor. The HFIP hydrolyzable precursor is a compound, other than sevoflurane itself, that has an intact 1,1,1,3,3,3-hexafluoroiso... | 05/20/2008 |
| 7288682 | Separation of bifunctional perfluoropolyethers (PFPEs) having -CHOH termination from their mixtures with -CHOH monofunctional PFPEs A process for separating bifunctional perfluoropolyethers (PFPEs) having two terminations —CH2OH from their mixtures with monofunctional PFPEs with one termination —CH2OH, of general formula X1—O—Rf—Y (I) | 10/30/2007 |
| 7230142 | Process for purifying fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether A process for purifying fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether containing at least 1,1,1,3,3,3-hexafluoroisopropyl alcohol. The purifying process comprises the treatment of causing fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether containing at least 1,... | 06/12/2007 |
| 7230143 | Chromatographic method for the analysis of both in process and finished sevoflurane A method in which organic matter found in a crude sevoflurane may be separated, identified, and quantified using a CARBOWAX™ (polyethylene glycol) capillary gas chromatographic column or an alkyl polysiloxane capillary gas chromatographic column. Also provided is ... | 06/12/2007 |
| 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 |
| 7067690 | Separation of diastereoisomers Process for modifying the relative ratios of the components of a liquid starting mixture of specific diastereoisomers, containing at least two asymmetric carbon atoms comprising contacting said liquid mixture with a Lewis acid compound capable of co-ordinating a com... | 06/27/2006 |
| 7034190 | Process for the production of fluoromethyl hexafluoroisopropyl ether A process for the production of fluoromethylhexafluoroisopropylether which comprises contacting bis(fluoromethyl)ether with hexafluoroisopropyl alcohol in which the molar ratio of the ether to alcohol is in excess of 2:1. The reaction takes place in the presence of ... | 04/25/2006 |
| 7019178 | Process for the purification of fluoromethyl hexafluoroisopropyl ether A process for the purification of fluoromethyl hexafluoroisopropyl ether involving contacting a crude composition containing impure fluoromethyl hexafluoroisopropyl ether with an adsorbent having pores with a range of pore sizes whereby the difference between the sm... | 03/28/2006 |
| 6992213 | Method for removing trifluoroethanol from liquids Trifluoroethanol can be isolated from organic liquids that are contaminated by trifluoroethanol by bringing the contaminated liquid into contact with a molecular sieve having a pore size ranging between 0.5 and 1.0 nm, e.g., with molecular sieve 13X. This enables, f... | 01/31/2006 |
| 6987204 | Process for recovery of 1,1,1,3,3,3-hexafluoroisopropanol from the waste stream of sevoflurane synthesis Provided is a process of obtaining 1,1,1,3,3,3-hexafluoro-2-propanol (“HFIP”) from a composition comprising an HFIP hydrolyzable precursor. The HFIP hydrolyzable precursor is a compound, other than sevoflurane itself, that has an intact 1,1,1,3,3,3-hexafluoroiso... | 01/17/2006 |
| 6566559 | Process for the production of isopropenyl methyl ether Process for the production of unsaturated ethers, in particular isopropenyl methyl ether (IPM), by pyrolysis of a ketal-containing or acetal-containing mixture, in particular dimethoxypropane (DMP), in the liquid phase in the presence of an organic carbox... | 05/20/2003 |
| 6555086 | Hydrogen fluoride recovery process Processes for separating and recovering hydrogen fluoride from a gaseous mixture of an organic compound and hydrogen fluoride are disclosed. The processes include contacting the gaseous mixture with a solution of an alkali metal fluoride in hydrogen fluor... | 04/29/2003 |
| 6448451 | Process for removal of dimethyl ether in the synthesis of sevoflurane The invention provides a process for purifying methyl 2,2,2-trifluoro-1-(trifluoromethyl)ethyl ether, comprising: passing a composition comprising methyl 2,2,2-trifluoro-1-(trifluoromethyl)ethyl ether and dimethyl ether through an evaporation zone; evapor... | 09/10/2002 |
| 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 |
| 6245953 | Method for recovering fluorine-containing solvents In a method for recovering a fluorine-containing solvent from the mixture comprising the fluorine-containing solvent and dyes, (i) a method for recovering a fluorine-containing solvent by distillation; and (ii) a method for recovering a fluorine-containin... | 06/12/2001 |
| 6198009 | Perfluoropropylvinylether purification Perfluoropropylvinylether (FPVE) purification process with C1 -C10 alcohols or mixtures thereof.... | 03/06/2001 |
| 6100434 | Method for synthesizing sevoflurane and an intermediate thereof A method for synthesizing fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether. The method includes the step of combining in the presence of aluminum trichloride a quantity of hexafluoroisopropanol and a quantity of either 1,3,5-trioxane or paraformaldehyde... | 08/08/2000 |
| 5951829 | Separation of heteropoly compounds from polyethers, polyesters and polyether esters A method of separating heteropoly compounds from mixtures of polyethers, polyesters and/or polyether esters, a protic component and heteropoly compounds, wherein the protic component is removed from the mixture and subsequently separating off the heteropo... | 09/14/1999 |
| 5763684 | Method of purifying fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether The present invention relates to a method of removing bisfluoromethyl ether contained in fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether in a simple, effective manner, and is characterized in that fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether cont... | 06/09/1998 |
| 5705710 | Process for the synthesis of hexafluoroisopropyl ethers This invention relates to a method of synthesizing 1,1,1,3,3,3-hexafluoroisopropyl ether compounds from the reaction of methoxymalanonitrile with a bromine trifluoride composition.... | 01/06/1998 |
| 5684210 | Method of purifying fluoromethyl-1,1,1,3,3,3, hexafluoroisopropyl ether It is possible to obtain fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether which has a high purity and in which an impurity making the purification by distillation difficult has been removed, by contacting a crude fluoromethyl-1,1,1,3,3,3-hexafluoroisopr... | 11/04/1997 |
| 5684211 | Method of purifying fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether The present invention provides a method of purifying fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether by adding a compound selected from hydroxides of, hydrogenphosphates of, phosphates of, hydrogencarbonates of, borates of or sulfites of alkali metals,... | 11/04/1997 |
| 5600022 | Method for recovering chloromethyl methyl ether In a reaction for introducing chloromethyl groups into an aromatic crosslinked copolymer by reacting chloromethyl methyl ether to the aromatic crosslinked copolymer in the presence of a chloromethylation reaction catalyst, a method for recovering chlorome... | 02/04/1997 |
| 5352785 | Continuous process for purifying perfluorochemical compositions A process for the purification of a perfluorochemical composition comprises continuously mixing the perfluorochemical composition, comprising a liquid mixture of inert perfluorochemicals (e.g., perfluoroalkanes, perfluoroethers, perfluoroaminoethers, or p... | 10/04/1994 |
| 5230778 | Purification of isoflurane by extractive distillation A method for the separation of Isoflurane from its admixture with other compounds produced in the chlorination of 2-difluoromethoxy-1,1,1-trifluoroethane including subjecting the mixture to distillation, distilling off the Isoflurane and effecting said ... | 07/27/1993 |
| 5166453 | Method for purification of ethylene compounds having fluorine-containing organic group A purification method of a fluorine-containing alkylethylene comprises reacting the fluorine-containing alkylethylene with powdered metallic zinc in the presence of an aqueous acetic acid solution. By this method, fluorine-containing alkyl iodide and fluo... | 11/24/1992 |
| 4940797 | Process for synthesis of FK-506 C10-C18 intermediates A process is described for the improved synthesis of the optically pure C10 -C18 fragment of the macrolide structure of the immunosuppressant FK-506. This compound is also useful as an intermediate for preparing FK-506 derivatives.... | 07/10/1990 |
| 4792638 | Isolation process of 2-chloroethyl vinyl ether The present invention relates to an isolation process of 2-chloroethylvinyl ether from a thermal decomposition product of 1,1-di(2-chloroethoxy)ethane, and comprises the azeotropic distillation of 2-chloroethyl vinyl ether and 2-chloroethanol from the pro... | 12/20/1988 |
| 4608446 | Process for the preparation of low molecular weight polyhydroxyl compounds The instant invention relates to an improved process for the preparation of low molecular weight polyalcohols by the catalytic hydrogenation of a mixture of different low molecular weight hydroxy aldehydes, hydroxy ketones and optionally also polyhydric a... | 08/26/1986 |
| 4501869 | Cross linkable fluorine-containing polymer An easily cross linkable fluorine-containing polymer comprising: (1) a polymeric chain comprising one or more polymer segments, at least one polymer segment of which consists of units of at least one fluorine-containing ethylenically unsaturated compound ... | 02/26/1985 |
| 4469898 | Method of synthesizing fluoromethylhexafluoroisopropyl ether A method of synthesizing fluoromethylhexafluoroisopropyl ether, comprising mixing hexafluoroisopropyl alcohol, formaldehyde, hydrogen fluoride, and a protonating, dehydrating and fluoride ion-generating agent under conditions suitable to generate fluorome... | 09/04/1984 |
| 4334105 | Method for the dehalogenation of ethers Methods for the dehalogenation of various haloethers are disclosed, comprising providing a haloether having the formula CX'3 -[CY2 ]n -O-CZ2 -CX3 in which X', Y, Z and X are specifically disclosed com... | 06/08/1982 |
| 4328376 | Method of removing fluorinated olefin byproduct formed during the synthesis of a fluorinated ether The method of removing fluorinated olefin byproduct formed during the synthesis of a fluoromethylhexafluoroisopropyl ether product or the like comprises: adding ammonia or an amine to the mixture to react with the fluorinated olefin byproduct, and thereaf... | 05/04/1982 |
| 4250334 | Method of synthesizing fluoromethylhexafluoroisopropyl ether A method of synthesizing fluoromethylhexafluoroisopropyl ether comprises adding hexafluoroisopropyl alcohol to a mixture comprising a stoichiometric excess of paraformaldehyde and hydrogen fluoride, plus sufficient sulfuric acid to sequester most of the w... | 02/10/1981 |
| 4130629 | Control of halomethyl ether emissions Emissions of halomethyl ethers are controlled by contacting a gaseous effluent stream containing said ethers with a scrubbing solution comprising an alkali metal hydroxide, a lower dialkanolamine and a lower alkylene glycol.... | 12/19/1978 |
