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| Number | Title | Issue Date |
| 7268248 | 3-Cyano-2,4,5-trifluorobenoxyl fluoride and intermediate products for the production thereof The present invention relates to 3-cyano-2,4,5-trifluorobenzoyl fluoride and to intermediates for its preparation and to the process for the preparation of 3-cyano-2,4,5-trifluoro-benzoyl fluoride, which starts from 5-fluoro-1,3-xylene (VIII); which is bichlorinated... | 09/11/2007 |
| 7211704 | Method for producing p-dichlorobenzene In a process for preparing p-dichlorobenzene by nuclear chlorination of benzene and/or chlorobenzene as the starting material with chlorine molecules, chlorination is carried out using aluminum chloride in an amount of 0.1–3 millimols per mol of the starting mater... | 05/01/2007 |
| 7084317 | Oxidative halogenation of aromatic compound A process for the halogenation of an aromatic compound wherein the aromatic compound is admixed with a halogenating agent in the presence of an ionic liquid is described. The method in preferably halide, sulfur or nitrate ionic liquids has significant advantages ove... | 08/01/2006 |
| 7012166 | Catalyst composition and method for chlorinating aromatic compounds Aromatic compounds such as toluene and o-xylene are chlorinated in the presence of a catalyst combination prepared by combining (A) at least one salt comprising a metal selected from the group consisting of a Group 4–12 metal, a lanthanide and an actinide; and a c... | 03/14/2006 |
| 6958423 | Bromination process This invention relates to a novel process which comprises feeding a mixture formed from diphenylethane and bromine to a stirrable reaction mass comprised of bromine and a bromination catalyst to yield a decabromodiphenylethane wet cake which can be most economically... | 10/25/2005 |
| 6930216 | Method for the nuclear chlorination of ortho-xylene A method for the nuclear chlorination of ortho-xylene using a chlorinating agent in the presence of at least one Friedel-Crafts catalyst and chloro-substituted 2,8-dimethylphenoxathiin as co-catalyst. The co-catalyst used is preferably tetrachlorinated 2,8-dimethylp... | 08/16/2005 |
| 6841707 | Method and apparatus for producing decabromodiphenyl alkanes A method of producing decabromodiphenyl alkanes includes the steps of charging a reaction vessel with bromine and a bromination catalyst and introducing a diphenyl alkane into the vessel at a location above the level of the charge bromine and catalyst. A dip tube ap... | 01/11/2005 |
| 6710217 | Method for producing 4-chlorobiphenyl and 4-chlorobiphenyl-specific specifications The invention relates to a process for preparing 4-chlorobiphenyl by (a) reacting biphenyl and chlorine in the presence of one or more ring-chlorination catalysts, and (b) subjecting the reaction mixture obtained in step (a) to fractional distillation ... | 03/23/2004 |
| 6706934 | Method for producing 2,3,4,5-tetrachlorobenzotrifluoride Disclosed herein is a method for producing 2,3,4,5-tetrachlorobenzotrifluoride comprising chlorinating 4-chlorobenzotrifluoride with elemental chlorine, in the presence of from 0.1 to 2% by weight of iron(III) chloride and 0.05 to 0.75% by weight of aluminum(III) ch... | 03/16/2004 |
| 6426440 | Method for preparing decomposition products from the thermal decomposition of 1,2-dichlorethane The work-up of the gaseous products from the thermal cracking of 1,2-dichloroethane is simplified if the cracking gases are cooled to a temperature range of about 150 to 180° C., only a subsidiary proportion, which comprises all the coke formed, being co... | 07/30/2002 |
| 6222079 | Method of increasing certain isomeric ratios in chlorinating substituted benzenes Disclosed is a method of increasing the percentage of certain isomers made when di or tri-substituted benzenes are chlorinated in the presence of a Friedel-Crafts catalyst. The use of about 0.001 to about 1 wt % a cocatalyst during chlorination alters the... | 04/24/2001 |
| 6211399 | Pressurized chlorination and bromination of aromatic compounds Disclosed is a method of adding 1 to 4 chlorine or bromine atoms to an aromatic ring of compound that has at least one electron-withdrawing groups on that ring. The aromatic compound is reacted with a chlorinating agent or a brominating agent in the prese... | 04/03/2001 |
| 6156945 | Method of making high purity 2,4- and 3,4-dichlorotoluene Disclosed is a method of making high purity 2,4- and 3,4-dichlorotoluene from parachlorotoluene that contains some metachlorotoluene. About 0.0001 to about 5 wt % of a Friedel-Crafts catalyst and about 0.5 to about 10 equivalents of a brominating agent ar... | 12/05/2000 |
| 6130361 | Reducing meta content of isomeric mixtures of halo substituted toluenes Disclosed is a method of separating the meta isomer of a halotoluene having the general formula ##STR1## from a mixture with at least one other isomer, where X is Cl or Br. About 0.0001 to about 5 wt % of a Friedel-Crafts catalyst is added to the ... | 10/10/2000 |
| 6118018 | Chlorination and bromination of aromatic compounds at atmospheric pressure Disclosed is a method of adding 1 to 4 chlorine or bromine atoms to an aromatic ring of compound that has at least one electron-withdrawing groups on that ring. The aromatic compound is reacted with a chlorinating agent or a brominating agent in the prese... | 09/12/2000 |
| 6117278 | Method of making -chloroxylenes Disclosed is a method for making high purity -chloroxylenes. A composition is formed of about 15 to about 80 wt % of a xylene and about 20 to about 85 wt % of a solvent. The solvent can be toluene, ring halogenated toluene, benzotrichloride, ring h... | 09/12/2000 |
| 6028232 | Para-chlorination of aromatic compound The present invention relates to a catalyst for preparing para-chloro aromatic compounds by the liquid-phase chlorination method. The catalyst is prepared by loading transition metal salts, rare earth metal salts or a mixture thereof, and alkali metal or ... | 02/22/2000 |
| 5969200 | Process for the manufacture of acetonylbenzamides Novel routes for the preparation of acetonylbenzamides are provided by the reaction of an amine and acyl chloride. Novel routes to various intermediates used in the manufacture of acetonylbenzamides are also disclosed.... | 10/19/1999 |
| 5696311 | Additive fire retardants, process for their preparation and polymeric compositions containing them Novel fire retardant compounds are disclosed, which are poly-halogenated TMPI and MPI compounds containing three or more halogen atoms per molecule. A process for the preparation of these compounds and polymeric compositions containing them are also descr... | 12/09/1997 |
| 5679874 | Process for the preparation of dichloro-(2,2)-paracyclophane Process for the preparation of dichloro-(2,2)-paracyclophane from p-methylbenzylhalide through 2(3)-chloro-p-methylbenzyltrimethylammonium halide by Hofmann elimination of 2(3)-chloro-p-methylbenzyl trimethylammonium hydroxide in an aqueous solution of al... | 10/21/1997 |
| 5457248 | Brominated diphenylalkane products and processes Described are processes for preparing brominated diphenylalkane products which are far whiter than prior known brominated diphenylalkane products. The resultant white brominated diphenylalkane products also form a part of the present invention, as do form... | 10/10/1995 |
| 5324874 | Process for a decarbromodiphenylethane predominate product having enhanced whiteness This invention relates to an improvement in a process for preparing a product predominant in decabromodiphenylethane. In the improved process the diphenylethane is reacted with bromine in the presence of bromination catalyst in a reaction vessel by feedin... | 06/28/1994 |
| 5315049 | Process for the nuclear chlorination of aromatic hydrocarbons Alkylaromatics are subjected to nuclear chlorination in the liquid phase in the presence of Friedel-Crafts catalyst mixtures comprising compounds of iron and antimony and cocatalysts of the formula (II) ##STR1## wherein the substituents have the mean... | 05/24/1994 |
| 5292975 | Process for decreasing the halogen content of polyhalogenated aromatics When the halogen content of polyhalogenated aromatics is decreased by reaction with monohalogenated and/or non-halogenated aromatics in the gas phase, good yields and significantly improved catalyst service lives are achieved if the reaction is carried ou... | 03/08/1994 |
| 5210343 | Process for the preparation of p-dichlorobenzene Dichlorobenzene having an increased p-content and a greatly reduced m-content is obtained by ring chlorination of benzene or chlorobenzene in the presence of Friedel-Crafts catalysts if the reaction is carried out in the presence of co-catalysts of the fo... | 05/11/1993 |
| 5157170 | Process for reacting polyhalogenated aromatic compounds with monohalogenated or nonhalogenated aromatic compounds The halogen of a polyhalogenated aromatic compound can be transferred to a monohalogenated or nonhalogenated aromatic compound by reaction in the presence of ruthenium as the element or in the form of compounds and if desired with one or more metal compou... | 10/20/1992 |
| 5149892 | Chlorinated benzenes Benzene or a chlorinated benzene feedstock compound represented by the formula C6 H6-x Clx is chlorinated in the rectifying zone of a catalytic distillation reactor to produce a chlorinated benzene product compound represe... | 09/22/1992 |
| 5124496 | Process for decabromodiphenylalkane predominant product This invention relates to a white or at least near white flame retardant product which is predominant in decarbromodiphenylalkane, and which product contains a minor amount of impurities; to a process for preparation of the flame retardant product; to a p... | 06/23/1992 |
| 5105036 | Process for ring-chlorination of aromatic hydrocarbons Aromatic hydrocarbons monosubstituted by straight-chain or branched C1 -C12 -alkyl or by Chd 3-C8 -cycloalkyl can be chlorinated in the aromatic ring in the liquid phase in the presence of Friedel-Crafts catalysts if cycli... | 04/14/1992 |
| 5055235 | Bromination process A process is disclosed for preparing a mixture of brominated, non-condensed ring polyaromatics, which process features multiple bromination temperatures and multiple catalyst additions for brominating the precursor non-condensed ring polyaromatic. The mix... | 10/08/1991 |
| 5015685 | Preparation of tetrabromotetralin The novel compound 5,6,7,8-tetrabromo-1,2,3,4-tetrahydro-naphthalene (tetrabromotetralin) of the formula: ##STR1## was prepared using 1,2,3,4-tetrahydro-naphthalene as the starting compound. Tetrabromotetralin was employed to prepare flame-retardant ... | 05/14/1991 |
| 5008477 | Decabromodiphenyl alkane process This invention relates to a process for preparing a white or at least near white product which is predominant in decabromodiphenyl alkane and which has an average bromine number of at least 9.0.... | 04/16/1991 |
| 5003117 | Process for decabromodiphenyl methane This invention relates to process for preparing decabromodiphenyl methane, which process comprises: charging a reaction vessel with a first portion of a reaction solvent, a catalytic amount of a halogenation catalyst and from about 10 moles to about 30 mo... | 03/26/1991 |
| 5001290 | Production of dichlorobenzene with high para to ortho ratios A method for producing p-dichlorobenzene using a reactor containing a catalyst/reagent to convert chlorobenzene (or benzene) to p-dichlorobenzene, the reactor having an inlet and an outlet for introducing reactants and removing product; introducing a puls... | 03/19/1991 |
| 4990707 | Process for the ring chlorination of aromatic hydrocarbons Aromatic hydrocarbons which are monosubstituted by straight-chain or branched C1 -C12 -alkyl or by C3 -C8 -cycloalkyl can be chlorinated in the presence of Friedel-Crafts Catalysts in liquid phase on the aromati... | 02/05/1991 |
| 4983781 | Process for the preparation of 4,4'-dibromobiphenyl in a solvent medium and with a catalyst The preparation of 4,4'-dibromobiphenyl. A biphenyl is reacted with bromine in a solvent in the presence of a catalytic system based on at least one component selected from the group consisting of Lewis acids and iodine.... | 01/08/1991 |
| 4935562 | Method for producing 4,4'-dibromobiphenyl A method for producing 4,4'-dibromobiphenyl, which comprises reacting biphenyl and from 2 to 3 mol times, relative to biphenyl, of bromine in a halogenated hydrocarbon solvent in the presence of a catalyst which is a simple substance of an element selecte... | 06/19/1990 |
| 4925994 | Process for the ring chlorination of aromatic hydrocarbons Aromatic hydrocarbons which are monosubstituted by straight-chain or branched C1 -C12 -alkyl or by C3 -C8 -cycloalkyl can be chlorinated in the presence of Friedel-Crafts Catalysts in liquid phase on the aromati... | 05/15/1990 |
| 4891455 | Process for preparing monohalogenated cyclobutarenes Monohalogenated cyclobutarenes are prepared by halogenating a cyclobutarene in the presence of an organic complexing agent, an acid scavenger, or water. Faster reaction rates highly selective to monohalogenated cyclobutarenes are obtained without conventi... | 01/02/1990 |
| 4886923 | Process for the preparation of tricyclo 8.2.2.2 hexadeca 4,6,10,12,13,15 hexaene chlorinated in the benzene rings A process for the chlorination of the benzene rings of tricyclo 8.2.2.2 hexadeca 4,6,10,12,13,15 hexane (or (2,2)-paracyclophane) having the formula (I): ##STR1## by gaseous chlorine, by operating in the presence of at least one metal chloride a... | 12/12/1989 |
