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Class 570/202 - Isomerization


Subclass of Class 570 - Organic compounds -- part of the class 532-570 series
Definition: Process wherein a compound is converted into another compound
No. of patents: 30
Last issue date: 09/11/2007


NumberTitleIssue Date
7268262Method for recovering trans-1,2-dichloroethene
Describes a method for recovering trans-1,2-dichloroethene from a liquid feed composition comprising both the cis-and trans-isomers of 1,2-dichloroethene and contaminating amounts of other chlorinated hydrocarbons, e.g., lower alkyl chlorinated hydrocarbons, such as...
09/11/2007
7138554Synthesis of (dibromocyclobuta) aromatic compounds
A method for the synthesis of cyclobuta aromatic compounds by cyclizing two ortho dibromoalkyl substituents is described. Using a mediator, such as nickel metal, and continuous removal of product from contact with the mediator, high product yields are achieved. A me...
11/21/2006
6933417Process for vinyl chloride manufacture from ethane and ethylene with partial CHl recovery from reactor effluent
A process for producing vinyl chloride monomer from ethylene and ethane having input of significant quantities of both ethane and ethylene in input streams to the affiliated reactor where hydrogen chloride in the reactor effluent is only partially recovered from the...
08/23/2005
6909024Process for the conversion of ethylene to vinyl chloride and novel catalyst compositions useful for such process
This invention is a process for producing vinyl chloride from an ethylene-containing feed, oxygen, and a chlorine source in the presence of a catalyst. The process permits direct production of vinyl chloride in a single reactor system, and further permits ethane to ...
06/21/2005
6781021Method for isomerizing halogenated aromatics
A catalyst composition with a high halogenated aromatics isomerization activity, a halogenated aromatic isomerization method using said catalyst composition, and a halogenated aromatics isomerization method capable of prolonging the life or regeneration period of th...
08/24/2004
6235952Method for isomerizing halogenated ethylbenzene and method for separating halogenated ethylbenzene isomers
A method for isomerizing a halogenated ethylbenzene characterized by bringing the same into contact with an acidic zeolite containing at least one metal selected among metals of Groups 7 to 11; and a method of efficiently isolating a m-halogenated ethylbe...
05/22/2001
5466881Process for preparing m-chloroaromatics
In the preparation of m-chloroaromatics by isomerizing corresponding o- and/or p-chloroaromatics in the liquid phase over zeolites, the activity of the zeolites remains at a high level for a particularly long time if the process is carried out in the pres...
11/14/1995
5180862Process for isomerizing trichlorobenzene
A process for isomerizing trichlorobenzene is disclosed. In the process of the present invention, a mixture of trichlorobenzene isomers containing 1,3,5-trichlorobenzene and/or 1,2,3-trichlorobenzene in small concentrations is contacted with a catalyst in...
01/19/1993
5159082Process for producing aromatic compound
A process for producing an aromatic compound is disclosed, which comprises coupling an aromatic sulfinic acid or a salt thereof with an aromatic halogen compound having at least one halogen atom attached to the carbon atom of the aromatic nucleus thereof ...
10/27/1992
5051536Method for isomerizing 1,2-dichloroethene
One stereoisomer of 1,2-dichloroethene is isomerized to the other stereoisomer in the liquid phase and in the presence of free radical initiator....
09/24/1991
5043493Process for the preparation of 2-chloro- or 2-bromo-naphthalene
Process for the preparation of 2-chloro- or 2-bromonaphthalene by isomerizing 1-chloro- or 1-bromonaphthalene over a zeolite as a catalyst which, in the anhydrous and template-free form, has the general formula (A) Z.Al2 O3.Ă—SiO.sub.2
08/27/1991
5030777Synthesis of 3,5-dichloroalkylbenzene and recovery of 1,3-dichlorobenzene
A process for synthesizing 3,5-dichloroalkylbenzene and recovering 1,3-dichlorobenzene from a starting mixture of 1,3- and 1,4-dichlorobenzenes. The process includes the sequential steps of selectively alkylating the 1,3-dichlorobenzene in the starting mi...
07/09/1991
4962245Process for preparing halogenated benzene derivatives
By a process for preparing halogenated benzene derivatives comprising distilling or stripping a mixture of the isomers of a halogenated benzene derivative containing a hydrogen halide to remove the hydrogen halide from the isomeric mixture of the halogena...
10/09/1990
4935561Process for isomerizing monochlorotoluenes or dichlorotoluenes
The invention relates to a process for isomerizing monochlorotoluenes or dichlorotoluenes on a zirconium-containing zeolite catalyst of the Pentasil type. Catalysts of this type are distinguished by a particularly high activity coupled with a long service...
06/19/1990
4895993Promoters for haloalkene isomerization
An isomerization of a haloalkene is conducted in the presence of a mixture of a copper compound and a trithiocarbonic acid derivative or dithiocarbonic acid derivative....
01/23/1990
4861928Process for the isomerization of dichlorotoluene
By using a catalyst containing an acid type zeolite and at least one component of metal selected from the group consisting of rhenium, nickel and silver and isomerizing a mixture of the isomers of dichlorotoluene in the presence of hydrogen, the concentra...
08/29/1989
4808759Process for the catalytic trans-halogenation of a poly-iodo-benzene
The invention concerns a process for the catalytic trans-halogenation of a poly-iodo-benzene, wherein said poly-iodo-benzene is made to react with benzene and with oxygen, in the presence of a zeolite of the X type or of the Y type, exchanged with an alka...
02/28/1989
4806698Liquid phase isomerization of iodoaromatic compounds
The invention relates to a process for isomerizing liquid iodoaromatic compounds over an acid catalyst....
02/21/1989
4806697Selective liquid phase disproportionation catalysts for iodoaromatics
The invention relates to a process for isomerizing iodoaromatic compounds over a non-acidic zeolite catalyst in the liquid or gas phase in the presence of a source of iodine....
02/21/1989
4792641Process for preparing iodinated aromatic compounds
The invention relates to a process for isomerizing and transiodinating iodoaromatic compounds over a non-acid catalyst....
12/20/1988
4774371Adsorptive separation process
A specific isomer of a trisubstituted benzene is continuously separated from a mixture containing at least two isomers of the trisubstituted benzene by adsorptive separation using a simulated moving bed, wherein a faujasite type zeolite adsorbent is used ...
09/27/1988
4760209Process for preparing 3,5-dichloro-଱-methylstyrene
In the preparation of 3,5-dichloro-଱-methylstyrene by isopropylation of an m/p-dichlorobenzene mixture, isomerization of the resulting alkylation mixture, subsequent side chain bromination of the alkylation mixture and dehydrobromination of the resu...
07/26/1988
4727201Preparation of 1,4-dichlorobenzene
1,2-dichlorobenzene is isomerized to 1,4-dichlorobenzene in the presence of a catalyst comprising (a) at least one of AlCl3 and AlBr3 and (b) at least one of iodine, alkaline earth metal halides and sulfates and lanthanide halides. B...
02/23/1988
4650915Process for preparing p-chlorotoluene and/or m-chlorotoluene
The invention relates to a process for preparing p-chlorotoluene and/or m-chlorotoluene by ring-chlorination of toluene by using the following two pages (a) and (b) when further processing the toluene chlorination product composed of mixed isomers: (a) Is...
03/17/1987
4629815Isomerization/rearrangement of polychlorobenzenes
Polychlorobenzenes are isomerized/rearranged, by reacting (i) at least one tetrachlorobenzene, or at least one tetrachlorobenzene in admixture with at least one trichlorobenzene, pentachlorobenzene and/or hexachlorobenzene, or (ii) pentachlorobenzene, or ...
12/16/1986
4479022Isomerization of bromohalogenobenzenes
Bromohalogenobenzenes are isomerized to useful, e.g., pharmaceutical or phytosanitary intermediates, by contacting the same with an alkaline base and a catalyst compound which forms a complex with the cation of said alkaline base....
10/23/1984
4409407Process for the preparation of 1,3,5-trichlorobenzene
1,3,5-Trichlorobenzene is prepared by the isomerization of other trichlorobenzenes at an elevated temperature after the addition of aluminum trichloride and formic acid....
10/11/1983
4368339Process for the isomerization of a halogenated toluene
Provided is a process for isomerizing a halogenated toluene using an acid form of zeolite as a catalyst....
01/11/1983
4368340Process for producing 1,3,5-trichlorobenzene
1,3,5,-Trichlorobenzene is produced by chlorinating 1,3,5-trihalobenzene having 1 to 3 bromine atom and 2 to 0 chlorine atom. The gaseous 1,3,5-halobenzene having 1 to 3 bromine atom and 2 to 0 chlorine atom is brought into contact with chlorine gas at a ...
01/11/1983
4347390Process for producing 1-bromo-3,5-dichlorobenzene
1-Bromo-3,5-dichlorobenzene is produced in high efficiency by a special isomerization of monobromodichlorobenzene in the presence of an aluminum halide and separating the object product and recycling a residue. 1-Bromo-3,5-dichlorobenzene is useful intermediat...
08/31/1982
 
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