Atochem

Elf Atochem S.a.

Societe Atochem

P C U K Produits Chimiques Ugine Kuhlmann

Pierre Durual

Jean-Marie Cognion

Andre Lantz

Jacques Kervennal

Gilles Drivon

Marc Hermant

Bernard Jean Gurtner

Elie Ghenassia

Jean-Claude Fayard

Charles Laviron

Laurent Germanaud

Dominique Basset

Gilbert Garcia

The present invention relates to firefighting foam concentrates including a protein hydrolysate in association with:

Alcohol resistant film-forming fluoroprotein foam concentrates

The invention relates to the synthesis of hydrogenperfluoroalkanes R.sub.F H, R.sub.F denoting a perfluoroalkyl radical containing 2 to 20 carbon atoms, by reaction of the corresponding perfluoroalkyl iodide R.sub.F I with an alkali metal hydroxide. The use of methanol as solvent allows the formation of tars to be avoided, an almost total conversion of R.sub.F I and an R.sub.F H of excellent purity to be obtained, and the alkali metal iodide by-product to be recovered easily.

Synthesis of hydrogen perfluoroalkanes

The invention relates to the preparation of perfluoroalkyl bromides or bromoperfluoroalkanes C.sub.n F.sub.2n+1 -Br (n=1 to 20). A perfluoroalkanesulphonyl chloride C.sub.n F.sub.2n+1 -SO.sub.2 Cl is reacted with a compound of formula: ##STR1## in which X represents a nitrogen or phosphorus atom and R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which may be identical or different, each represent an optionally substituted hydrocarbon radical, it also being possible for one of these symbols to be a hydrogen atom.

Synthesis of perfluoroalkyl bromides

The invention relates to the preparation of perfluoroalkyl bromides or bromoperfluoroalkanes, CnF.sub.2n+1 -Br (n=1 to 20). Gaseous hydrogen bromide is reacted with a perfluoroalkanesulphonyl chloride, C.sub.n F.sub.2n+1 -SO.sub.2 Cl, in the presence of a catalyst consisting of a tertiary amine or phosphine or a quaternary ammonium or phosphonium salt, at a temperature ranging from 80.degree. to 200.degree. C.

The invention relates to new polyfluorinated compounds which are usable as anti-wear additives for lubricants. These compounds are of general formula: ##STR1## in which R.sub.F is a perfluoroalkyl radical, R.sub.1 and R.sub.3 each denote a hydrogen atom or an alkyl, cycloalkyl or aryl radical, R.sub.2 and R.sub.4 each denote a hydrogen atom or an acyl residue, m equals 0 or 1 and X denotes a hydrogen atom or a 2-hydroxy-1-phenylethyl group. They are prepared by hydrogenation of amino alcohols of formula:

Polyfluorinated amino alcohols and their esters, preparation of these

In order to improve the wear resistance properties of lubricants, at least one compound of the following formula is incorporated therein: ##STR1## Rf is a perfluorinated radical, a=0 to 10,

Lubricants and new polyfluorinated compounds which can be used as

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

Decane-1,10-diisocyanates corresponding to the formula ##STR1## wherein R.sub.1 is an alkyl or cycloalkyl radical, and R.sub.2 is a hydrogen atom or an alkyl or cycloalkyl radical and the method of making these diisocyanates by the phosgenation of 1,10-diaminodecanes of the formula ##STR2##

Decane-1,10-diisocyanates and methods of making the same

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

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.

Growing community of inventors

Vernaison, France

Pierre Durual