Produits Chimiques Ugine Kuhlmann

Atochem

P C U K Produits Chimiques Ugine Kuhlmann

Societe Atochem

Elf Atochem S.a.

Jean-Marie Cognion

Jacques Kervennal

Pierre Durual

Dominique Guillet

Bernard Cheminal

Pierre Braunstein

Bernard Berthe

Gerard Letray

The invention relates to hydrogenolysis of a chlorofluoroethane XYClC--CClX'Y' or of a chlorofluoroethylene XClC.dbd.CX'Y (where at least one of the symbols X, X', Y and Y' is a fluorine atom and the others are hydrogen or chlorine atoms) which is performed on a mixed catalyst based on copper or silver and on at least one platinum group metal (Ru, Rh, Pd, Os, Ir, Pt), these metals being deposited on a support.

Manufacture of fluoroethylenes and chlorofluoroethylenes

The invention relates to the manufacture of chlorofluoroethanes of formula CF.sub.3 --CHF.sub.x Cl.sub.2-x, where x is equal to 0 or 1, by catalytic hydrogenation of a perhaloethane of formula CF.sub.3 --CF.sub.x Cl.sub.3-x. The use of an iridium-based catalyst deposited on a support enables the selectivity to be improved.

Selective hydrogenolysis of perhalogenated ethane derivatives

The invention relates to the manufacture of chlorofluoroethanes of formula CF.sub.3 --CHF.sub.x Cl.sub.2-x, where x is equal to 0 or 1, by the catalytic hydrogenation of a perhaloethane of formula: CF.sub.3 --CF.sub.x Cl.sub.3-x. The use of a ruthenium-based catalyst deposited on a support enables the selectivity to be improved.

A process for manufacturing silver catalysts deposited on a porous refractory support, comprising impregnating a refractory support with a portion of the silver required for the catalyst by immersing the support in a practically anhydrous solution of an organic carboxylic acid salt of silver in an organic liquid which complexes the silver ions, removing excess organic liquid from the support without causing the deposition of metallic silver thereon; depositing the remainder of the silver and at least one promoter selected from cesium, rubidium, or potassium on the support modified by the first silver deposit by immersing said modified support in a practically anhydrous solution of an organic carboxylic acid salt of silver in an organic liquid which complexes the silver ions, said organic liquid containing in the solubilized state, a salt of at least one of the promoters, before transformation of the silver deposited into metallic silver.

Process for making ethylene oxide catalyst

Process for the manufacture of high purity ethylene by the decomposition in the gaseous phase of certain aliphatic carboxylic acid esters, at a temperature between about 150.degree. and 300.degree. C. in the presence of a zeolite having a pore diameter above about 0.6 nm as the catalyst.

Process for the manufacture of ethylene from ethyl esters

A process for the manufacture of aromatic isocyanates by carbonylation of nitro derivatives comprising carrying out the reaction in the presence of supported catalysts containing as the active phase particles or an oxide of a precious metal of Group VIII and of a metal selected from Group V.sub.B, VI.sub.B, and VIII of the Periodic Table; the precursor of the active phase being a heteropolymetallic complex and, more particularly, a mixed bimetallic cluster.

Process for the manufacture of aromatic isocyanates

Process for the preparation of 2-benzoxazolone and derivatives by the reaction, in the liquid phase, at a temperature from 100.degree. to 500.degree. C. and a pressure from 20 to 500 bars, of an ortho-nitrophenol of the formula: ##STR1## in which R represents a hydrogen or halogen atom, an alkyl group containing from 1 to 10 carbon atoms or an alkoxy group OR' in which R' represents an alkyl group containing from 1 to 10 carbon atoms, and carbon monoxide under pressure, characterized in that the process is carried out in the presence of

Process for the preparation of 2-benzoxazolone and derivatives from

A process for the manufacture of polyurethanes by direct reaction in the liquid phase, comprising reacting, in the presence of a catalyst, carbon monoxide with a nitrated hydroxy-aromatic derivative of the formula:

Process for the manufacture of polyurethanes by carbonylation of

The invention concerns a process for the preparation of 2-(4-aminophenyl)-5-aminobenzimidazole and substituted derivatives by catalytic cycloreduction of starting material N-(4-nitrobenzoyl)-2,4-dinitroaniline or a substituted derivative by hydrogen gas. According to the invention, the starting material is treated in suspension in an aqueous solution of hydrochloric or phosphoric acid, the content (C) of starting material in said suspension ranging from 0.15 to 1.5 mole per liter and the molar ratio (A): acid/starting material being from 2 to 20. The process is carried out at a hydrogen pressure from 5 to 100 bars and a temperature (T) from 20.degree. to 150.degree. C. selected so that the product T.times.A.times.C is equal to or greater than 25. There is thereby obtained a product of excellent purity with very good yields.

Process for preparing 2-(4-aminophenyl)-5-amino-benzimidazole and

A process for the synthesis of aromatic isocyanates by the reduction of aromatic derivatives with carbon monoxide in the presence of catalysts consisting of metal complexes of porphyrins. In one embodiment, the metallic porphyrin is synthesized in situ from a porphryin and a metal or a metal derivative.

Process for the preparation of organic isocyanates from nitro derivatives

Silver catalysts for vapor phase synthesis of ethylene oxide by reacting oxygen or gaseous mixtures containing same with ethylene, characterized by the use as support of a porous material having a specific surface area of less than 10 sq. m/g, a total volume of porosity of between 0.1 and 0.6 cm.sup.3 /g and a bimodal distribution of the porosity.

Supports for silver catalysts utilized in the production of ethylene

Substantially increased yields of pure-grade 8-hydroxyquinoline are obtained by gradual addition of a solution of o-nitrophenol in acrolein or in an allylidene acetal or diester, to an aqueous acid solution of o-aminophenol. 8-hydroxyquinoline is an article of commerce having known uses.

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Saint Genis Laval, France

Jean-Marie Cognion