Norsolor

Societe Chimique Des Charbonnages S.a.

Atochem

Sollac

Societe Nationale Des Poudres Et Explosifs

Exxon Chemical Company

Sollac, a French Body Corporate

Norsolor Tour Aurore

Nosolor

Cdf Chimie

Francis P Petit

Andre Mortreux

Karel Bujadoux

Yves Castanet

Gerard Buono

Eric Paumard

Jean M Fuchs

Gilbert Peiffer

Jean M Brusson

Michele Petit

Jean A Cordier

Sylvain Mutez

Jean-Michel Brusson

Serge Melloul

Henri Samain

Serge L Lecolier

Bruno Seuillet

Christophe Legrand

Dominique Huchette

Bernard Dussart

Philippe Denis

Andre Mortreuz

A process is disclosed for the polymerization of olefins, using (i) a catalyst and (ii) an organometallic activator from Groups I, II or III of the Periodic Table at temperatures between 20.degree. and 250.degree. C., and pressure up to 200 bar, in solution, or in suspension in an inert liquid hydrocarbon, at temperatures between 160.degree. and 350.degree. C., under pressures of between 400 and 3000 bar, in a continuous manner in a reactor where the mean residence time of the catalyst is between 1 and 150 seconds. The catalyst comprises at least one titanium compound, at least one halogen-containing organoaluminum compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihaloalkane. The titanium compound is essentially a titanium (III) compound, the total content of titanium (II) and titanium (IV) being less than or equal to 15% of the total content of titanium. The catalyst is obtained by a process comprising, in a first step, the reduction of a titanium (IV) compound in an .alpha.,.omega.-dihaloalkane by means of a molar excess of at least one halogen-containing organoaluminum compound, in the absence of an ether, and, in a second step, the addition to the reaction mixture of a compound which forms a magnesium halide in situ without supplementary reduction of the titanium compound obtained in the first step. Molar ratios of the .alpha.,.omega.-dihaloalkane, the titanium compound, halogen-containing organoaluminum, and the compound which forms a magnesium halide in situ are also described.

Process for the preparation of a catalyst for the polymerization of

Process for the preparation of a catalytic composition for the polymerization of olefins. At least partial electrochemical oxidation of aluminum in a solvent of .alpha.,.omega.-dihalogeno-alkane and simultaneously the electrochemical reduction of a compound of titanium (IV) occur in process. The catalytic composition comprises at least one titanium compound, at least one halogenated organo-aluminum compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihalogeno-alkane. The titanium compound is essentially a titanium (III) compound. The overall content of titanium (II) and titanium (IV) is less than or equal to 15% of the total titanium content.

Catalytic composition for the polymerization of olefins and its process

The process comprises, in a first step, the reduction of a titanium (IV) compound in an .alpha.,.omega.-dihalogenoalkane using a molar excess of at least one halogenated organoaluminium compound in the absence of an ether, and then in a second step, the addition of a reaction mixture of a compound capable of forming a magnesium halide in-situ, without additional reduction of the titanium compound obtained in the first step. The catalyst contains at least one titanium compound, at least one halogenated organoaluminium compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihalogenoalkane; the titanium cmpound is essentially a titanium (III) compound, the total titanium (II) and titanium (IV) content being less than or equal 15% to the total titanium content. It may also contain at least one vanadium compound, an inert solvent, at least one partially polymerized .alpha.-olefin and at least one organometallic activator from groups I to II of the Periodic Classification. Also described is a process for polymerization of olefins in the presence of said catalyst.

Process for preparing a catalyst for the polymerization of olefins

Process for the preparation of a catalytic composition for the polymerization of olefins. At least partial electrochemical oxidation of aluminum in a solvent of .alpha., .omega.-dihalogeno-alkane and simultaneously the electrochemical reduction of a compound of titanium (IV) occur in process. The catalytic composition comprises at least one titanium compound, at least one halogenated organs-aluminum compound and at least one inorganic magnesium compound in suspension in at least one .alpha.,.omega.-dihalogeno-alkane. The titanium compound is essentially a titanium (III) compound. The overall content of titanium (II) and titanium (IV) is less than or equal to 15% of the total titanium content.

The invention relates to a process for the preparation of acetic anhydride, characterized in that a gas containing essentially CO, at a pressure of at least 1 MPa, is reacted with methyl formate in the presence of

Process for the preparation of acetic anhydride from methyl formate

Chiral phosphorus-containing ligands comprising at least one amine radical and at least one dihydrocarbylphosphinoxy radical of the formula W=OP (R).sub.2, in which R is a hydrocarbon radical selected from the group consisting of alkyl, aryl, and cycloalkyl radicals, wherein the ligand is selected from the group consisting of: those of the formula ##STR1## those of the forumula ##STR2## those of the formula ##STR3## those of the formula ##STR4##

Chiral phosphorous compounds, a process for their manufacture and their

The object of the invention is a process for the preparation of methyl acetate starting from the methyl formate, characterized in that methyl formate is converted at a temperature of 170.degree. to 220.degree. C. in the presence of:

Process for producing methyl acetate from methyl formate

Saturated carboxylic esters are produced from alkyl formate and an olefin, without the presence of substantial amounts of carbon monoxide, at a temperature of 120.degree. to 280.degree. C., under a pressure of 1 to 3,000 bars, in the presence of a catalyst based on ruthenium coordinated by ligands selected from carbon monoxide, halogen atoms and amines, and in the presence of an amide as a solvent. The catalyst is selected from catalysts consisting essentially of RuCl.sub.3.3H.sub.2 O; catalysts consisting essentially of the combination of an RuCl.sub.3.3H.sub.2 O together with at least one stabilizer selected from iodine, covalent iodides and quaternary ammonium halides; catalysts comprising Ru.sub.3 (CO).sub.12 together with at least one stabilizer such as is mentioned above; and catalysts selected from RuI.sub.3, [RuCl.sub.2 (CO).sub.3 ].sub.2, Ru(NH.sub.3).sub.6 Cl.sub.3 and [Ru(NH.sub.3).sub.5 Cl]Cl.sub.2, comprising, where appropriate, in addition, at least one stabilizer such as is mentioned above.

Catalyst and process for the synthesis of saturated carboxylic esters

Process for the asymmetric hydrogenation of carbonyl compounds obtained

Platinum hydrides with bridges bimetallic structure, method for their

The invention relates to a catalytic process for the synthesis of an alcohol by reaction of an epoxide with a nucleophilic compound containing a labile hydrogen, such as an alcohol, a phenol, a primary amine or a carboxylic acid. The catalyst is a metal complex of general formula (I) [M[Co(CO).sub.4 ].sub.2 ].sub.x in which x is equal to 1 or 2 and M denotes tin, lead and cadmium. The reaction preferably takes place in the presence of carbon monoxide. This process makes it possible to increase the yield and the selectivity of the reaction and the stereoselectivity for alcohol in the case of which the hydroxyl formed is attached to the least hindered carbon atom of the epoxide. The invention also relates to the new complexes of formula (I) in which x equals 2. It also relates to a process for the electrosynthesis of these new compounds by electroreduction of Co.sub.2 (CO).sub.8 in an organic solvent medium in a cell in which the anode consists of the metal M, followed by isolation of the complex, the temperature of the reaction mixture and that at which the complex is isolated being lower than 25.degree. C.

Catalytic process for the synthesis of an alcohol, new metal complexes

A method of using a chiral phosphorus-containing ligands comprising at least one amine radical and at least one dihydrocarbylphosphioxy radical of the formula W=OP (R).sub.2 ; from the group consisting of: those of the formula ##STR1## those of the formula ##STR2## those of the formula ##STR3## those of the formula ##STR4## in a hydrogenation reaction for the synthesis of optically active organic compounds comprising reacting at least one organic compound that does not possess a center of asymmetry with (A), on the one hand, at least one transition metal complex of the formula MZq in which M is a metal in group VIII of the Periodic Classification, q is the coordination number of the metal M, and Z is an atom or molecule capable of complexing the metal M and (B), on the other hand, at least one ligand L.

Chiral phosphorus compounds, a process for their manufacture and their

The catalyst system is characterized in that it comprises:

Catalyst system, process for its preparation and its application to the

Electrochemical catalytic system, the process for preparation thereof

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Villeneuve d'Asq, France

Francis P Petit