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7943015 |
Use of copolymers of perfluoro(alkyl vinyl ether) for photochemical reactions
A photochemical reaction apparatus including a reactor and a light source situated so that light from the light source is directed through a portion of the reactor wall is disclosed. The apparatus...
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7282120 |
UV-activated chlorination process
A method of producing alkanes containing chlorine by addition of chlorine to C—C double bonds or C—C triple bonds or by exchange of hydrogen for chlorine by contacting the starting compound in the...
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6702929 |
Purification of 1,1,1,3,3-pentafluorobutane
In the synthesis of 1,1,1,3,3-pentafluorobutane (R-365mfc), a mixture of R-365mfc and the impurity 1,1,1,3-tetrafluoro-2-butene (R-1354mzy) is purified and R-1354mzy is removed from the mixture by...
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6541677 |
Photochemical system and method for the removal of PCDD or PCDF compounds from industrial process emissions
A photochemical process for removing or minimizing the concentration of PCDD or PCDF compounds within an industrial gas stream. The process includes the gas phase of PCDD or PCDF compounds. Light...
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6398922 |
Photochemical gas-liquid process for halogenating alkylbenzenes
The invention provides a process for carrying out a photochemical gas-liquid process for halogenating alkylbenzenes, the process being carried out in a photochemical gas-liquid reactor comprising a...
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6265628 |
Process for the continuous preparation of mono- and/or bis(mono-and/or di-and/or trichloromethyl) benzenes
In a process for the continuous preparation of mono- and/or bis(mono- and/or di- and/or trichloromethyl) benzenes by gradual chlorination of the corresponding mono-or dimethylbenzenes in several...
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6203670 |
Method for grafting a substituted difluoromethyl group
Provided is a process for grafting a substituted difluoromethyl group onto a compound bearing at least one electrophilic substituent, comprising (i) contacting the compound bearing at least one...
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6203671 |
Method of producing fluorinated compounds
A process for preparing a fluorinated product comprising: (a) reacting a molar excess of an aliphatic starting compound in liquid phase with fluorine in the presence of actinic radiation to produce...
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6179970 |
Process for the preparation of fluoro compounds from the corresponding amines
Compounds containing a primary amino group are converted into compounds containing a fluorine atom in place of the amino group by reaction of the amino compound with hydrogen fluoride and a...
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6179972 |
Two stage process and apparatus for photocatalytic and catalytic conversion of contaminants
A process comprises passing a contaminated gaseous stream through a photocatalytic stage and, thereafter, through a catalytic stage.
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5944962 |
Process for photochlorination
An improvement in the process for the photochlorination of liquid mixtures of 2 to 6 carbon-containing aliphatic hydrofluorohalocarbons or hydrofluorocarbons and unsaturated hydrocarbons with...
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5866752 |
Destruction of volatile organic carbons
A method for removing VOCs from a gas stream comprising irradiating the gas stream in intimate contact with a semiconductor catalyst under laminar flow conditions. The catalyst can be chosen from a...
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5821393 |
Process for the preparation of aromatic bromoalkyl-substituted hydrocarbon compounds
The present invention relates to a process for the preparation of an aromatic bromoalkyl-substituted hydrocarbon compound, in which an alkyl-substituted aromatic hydrocarbon compound is reacted...
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5736012 |
Process for the preparation of a fluorinated acid
A process for the preparation of a fluorinated acid such as trifluoroacetic acid, including admixing an hydrofluorocarbon, such as 1,1,1-trifluoroethane, with chlorine, an oxidizing agent and an...
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5705779 |
Preparation of 1,1,1,3,3-pentachloropropane by photochlorination of 1,1,1,3-tetrachloropropane
A process for the preparation of 1,1,1,3,3-pentachloropropane (HCC-240fa). HCC-240fa is prepared by the photochlorination of 1,1,1,3-tetrachloropropane (HCC-250). HCC-240fa is an important...
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5698829 |
Photodegradation of toxic contaminants
A process is provided herein for extracting organic toxic contaminants including pentachlorophenol, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans, from wood, e.g., utility...
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5663543 |
Method for producing a polyfluoropropionyl halide
A method for producing a polyfluoropropionyl halide, which is characterized by oxidizing at least one dichloropentafluoropropane selected from 3,3-dichloro-1,1,1,2,2-pentafluoropropane and...
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5569782 |
Process for preparing polyfluorochlorocarbonyl chlorides and perfluorocarbonyl chlorides with addition of chlorine
A process for preparing polyfluorochloro- and perfluorocarbonyl chlorides, for example for preparing perfluoropropionyl chloride, chlorodifluoroacetyl chloride or trifluoroacetyl chloride, in which...
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5545298 |
Process for preparing polyfluorocarboxylic acid chlorides and perfluorocarboxylic acid chlorides
A process for preparing compounds corresponding to the formula RCFXC(O)Cl, in which X is fluorine or chlorine and R is fluorine or a perfluorinated C1- C10-alkyl group, preferably...
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5514254 |
Procedure for the photochlorination of alkyl-aromatic compounds
An alkyl-aromatic compound is selectively photochlorinated in the side chain in a cyclic reaction system wherein said compound is continuously circulated between a container and photochlorination...
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5486275 |
Nitrogen-containing perfluoroalkyl bromide and method for production thereof
A nitrogen-containing perfluoroalkyl bromide, a novel compound to the art, is represented by the formula, ##STR1## wherein Rf1 and Rf2 independently stand for a perfluoroalkyl group of one to five...
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5421971 |
Hydrochlorofluorocarbons and hydrofluorocarbons and methods for producing the same
A process for the preparation of compounds of the formula, F(CF2)a CC12 CC12 (CF2)b F where a and b are the same or different and are each an integer ≥1 (including the novel compound CF3 CF2 CC12 C...
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5378333 |
Halogenated polycarboxycubanes
The disclosure describes photochemical synthesis of halogenated polycarboxycubanes from simple carboxycubanes and an oxalyl halide. It is possible to synthesize...
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5354439 |
Process for the synthesis of fluorinated derivatives
A process for the synthesis of fluorinated organic compounds and a reagent suitable for use in the process. The process is carried out by exchange with fluorides, while preferably agitating the...
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5279719 |
Method for chlorination of methylated aromatic compounds
A process for chlorination of methylated aromatic compounds in a titanium tetrachloride is disclosed. The ring chlorination is first carried out by reacting said methylated aromatic compounds with...
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5262025 |
Telechelic telomers of chlorotrifluoroethylene and method for preparing same
Iodine terminated liquid telechelic telomers of chlorotrifluoroethylene (CTFE) containing an average of more than 1 CTFE unit per molecule are novel compounds. The telomers can be prepared by a...
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5259938 |
Process for omega-halo-perfluoro acid chlorides
A liquid phase process for preparing ω-haloperfluoroacid chlorides by the photo oxidation of polyfluoroalkyl mono- and di-chloromethanes in the presence of chlorine using light wavelengths greater ...
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5258110 |
Process for preparing peroxidic perfluoropolyethers
A process is disclosed for preparing peroxidic perfluoropolyethers containing perfluoroalkylenoxy units (CF2 --CF2 O) and (CF2 O), which is characterized in that tetrafluoroethylene and oxygen are...
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5240574 |
Process for the photochemical production of halogen compounds
The present invention provides a process for the photochemical production of compounds of the general formula: R--(C2 R4 ')n --Xby telomerisation of an alkyl halide R--X as telogen and of an olefin...
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5233075 |
Process for the preparation of aromatic carboxylic acid esters
A process comprising preparing an aromatic carboxylic ester and an alkyl iodide by carboxylating an aromatic iodide in the presence of an alkylating agent and a catalytic amount of a transition...
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5205914 |
Synthesis of desflurane
An improved preparation of desflurane, 1,2,2,2-tetrafluoroethyl difluoromethyl ether utilizing hexafluoropropene epoxide as a starting material. Hexafluoropropene epoxide is advantageous in that it...
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5143589 |
Perfluoropolyethers containing a halogen different from fluorine and having an acid end group
Perfluoropolyethers having an acid end group of the type of acyl fluoride (or chloride) or a carboxylic group or derivatives thereof, the other end group being a perfluoroalkyl containing one or...
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5104503 |
Photochemical dimerization of organic compounds
At least one of selectivity and reaction rate of photosensitized vapor phase dimerizations, including dehydrodimerizations, hydrodimerizations and cross-dimerizations of saturated and unsaturated...
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5098535 |
Process for preparing 14-α-hydroxy-4-androstene-3,6,17-trione
A process for the preparation in high yield of 14α-hydroxy-4-androstene-3,6,17-trione which has an aromatase inhibition activity and is useful as an antitumor agent, in which the 6β-hydroxyl g...
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5000830 |
Process for the production of perfluoropolyethers substantially constituted by perfluorooxyethylene and perfluorooxypropylene units
Improved process for producing perfluoropolyethers prevailingly constituted by repeating units --CF2 CF2 O--and ##STR1## with perfluoroalkyl terminal groups, wiith a mutual ratio of the above C3...
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4997988 |
Oxa-organic sulfur compounds, their preparation and use
Oxa-organic sulfur compounds, methods of preparing such compounds and methods of using the compounds as polymer chain length terminating agents are provided. The compounds are prepared by reacting...
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4980039 |
Microwave-mediated degradation of PCB wastes
This is disclosed a process for the decomposition of halogenated hydrocarbons including polychlorinated biphenyls (PCB) and chlorinated pesticides, as DDT and DDE. The process comprises...
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4978435 |
Free chlorine removal process
Free chlorine values are removed by radical chlorination from uncombined admixtures thereof, notably admixtures of free chlorine and at least one halogenated organic compound that is not completely...
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4966665 |
Method for photochemical decomposition of volatile organic chlorine compound in vent gas
A volatile chlorine-containing organic compound, e.g., trichloroethylene and tetrachloroethylene, contained in a vent gas as a pollutant of atmospheric air can be rapidly and efficiently decomposed...
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4956064 |
Dehalogenation of halogenated organic compounds
A process for dehalogenation of halogenated organic compounds comprising irradiating a two phase liquid solution containing said compounds with ultraviolet radiation. The two phase liquid is...
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4948479 |
Removal of unsaturated carbon compounds from 1,1-dichloro-1-fluoroethane
Liquid 1,1-dichloro-1-fluoroethane containing contaminating unsaturated carbon compounds is treated with chlorine and ultraviolet light to convert the unsaturated contaminants to photochlorination...
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4941957 |
Decomposition of volatile ogranic halogenated compounds contained in gases and aqueous solutions
The invention is a method and apparatus for rate enhanced decomposition of volatile organic halogenated compounds present in gases and aqueous solutions. Volatile organic halogenated compounds...
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4935114 |
Microwave-enhanced chemical processes
A process for disposal of toxic wastes including chlorinated hydrocarbons, comprising, establishing a bed of non-metallic particulates having a high dielectric loss factor. Effecting intimate...
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4929318 |
Process for preparing halogenated alkane
A halogenated alkane of the formula R--CHXY (I)wherein R is a trifluoromethyl group, a chlorodifluoromethyl group, a dichlorofluoromethyl group, a chlorofluoromethyl group, a difluoromethyl group,...
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4874488 |
Photochemical dimerization and functionalization of alkanes, ethers, primary and secondary alcohols, phosphine oxides and silanes
The space-time yield and/or the selectivity of the photochemical dimerization of alkanes, ethers, primary and secondary alcohols, phosphine oxides and primary, secondary and tertiary silanes with...
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4846945 |
Oxidation process
Oxidation of alcohols to ketones using bromine suffers from a side reaction of comparable speed in which a bromide substituted product is formed. Additionally, the use of bromine as reagent is...
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4780287 |
Decomposition of volatile organic halogenated compounds contained in gases
The invention is a method and apparatus for rate enhanced decomposition of volatile organic halogenated compounds. In the invention a stream of gas carrying these volatile organic halogenated...
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4767873 |
Helical metallocene oligomers and a method for their preparation
The invention describes a helicene compound having the structure ##SPC1##which contains seven six-membered conjugated aromatic rings capped by two five-membered rings which do not superimpose on...
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4746760 |
Process for functionalizing alkanes
Process for functionalizing saturated hydrocarbons comprising: (a) reacting said saturated hydrocarbons of the formula: R1 H wherein H represents a hydrogen atom; and R1 represents a saturated...
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4702809 |
Process for the production of 1,2,3-trichloro-2-methylpropane
For the production of 1,2,3-trichloro-2-methylpropane, 3-chloro-2-methylpropene is reacted with sulfuryl chloride in the presence of aldehydes and/or under the effect of light, especially UV light....
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