Atochem

Produits Chimiques Ugine Kuhlmann

Societe Atochem

Elie Ghenassia

Raymond Commandeur

Gilles Drivon

Rene Clair

Jean-Jacques Masini

Jean-Louis Guillaumenq

Bernard Jean Gurtner

Pierre Durual

Daniel H Balde

Gerard Krempf

Francois Fine

William Jequier

Andre Lakodey

Francois Laumain

Michel Bernard

Water-containing mixtures of at least one hydrocarbon/halocarbon and hydrochloric acid, e.g., the methyl chloride feedstream in conventional process for the synthesis of chloromethanes, are desiccated by intimately contacting such mixtures with an effective drying amount of an essentially anhydrous drying agent that includes (i) a metal sulfate, chloride or perchlorate, or (ii) phosphorus pentoxide.

Drying of hydrocarbon/hydrochloric acid/water admixtures

Halogenated organic species, e.g., chlorinated or brominated dioxins or dibenzofurans, PCBs, and the like, are consumed by contacting such species, at a temperature of greater than 220.degree. C., with a stoichiometric excess, relative to the halogen content thereof, of at least one alkali metal alcoholate.

Destruction of halogenated organic species

Mixtures of isomers, e.g., mixtures of phenethyl bromide and 1-phenyl-1-bromoethane, are separated by (a) selectively condensing one such isomer with an aromatic compound bearing at least one aryl (nuclear) hydrogen atom, e.g., xylene, in the presence of a catalytically effective amount of a Friedel-Crafts catalyst, e.g., ferric chloride, and then (b) separating the product of condensation, e.g., phenylxylylethane, from the unreacted isomer.

Separation of isomers, e. g., phenethyl bromide from

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 arylsulfonyl(alkyl)amides, notably N-(n-butyl)benzenesulfonamide, well adopted as heat-stable plasticizers for polyamides, e.g., nylon 11 and nylon 12, are directly prepared by (a) intimately contacting an arylsulfonyl halide with a stoichiometric excess of both an alkylamine and an alkaline agent, with the alkaline agent being present in aqueous solution, (b) eliminating water and excess alkylamine from the organic phase produced in stage (a), and (c) separating final product arylsulfonyl(alkyl)amide from the residual organic phase remaining after stage (b).

Preparation of arylsulfonyl (alkyl) amides

Phosphorus-containing flame proofing mixtures with low crystallization temperatures and with the ability significantly to improve the flame resistance of materials without adversely affecting the other properties of the materials, the mixtures being principally comprised of phosphonates having the structure: ##STR1## wherein X is chloro or bromo; Z.sub.1, Z.sub.2 and Z.sub.3 are the same or different and are --CH.sub.2 --CH.sub.2 -- or ##STR2## and R is CH.sub.3 or CH.sub.2 Cl, and the molar ratio of the --CH.sub.2 --CH.sub.2 --X groups to the total of --CH.sub.2 --CH.sub.2 --X and the --CH.sub.2 --CHR--X groups is from 2 to 90%, these flame proofing mixtures being usable with both synthetic and natural materials, together with the flame-resistive natural and synthetic materials so made.

Phosphorus-containing flame proofing compositions for synthetic materials

A process for the manufacture of the monoether of monoethylene glycol by the hydrogenolysis of a 2-alkyl-1,3-dioxolane, with a co-catalytic system of palladium and an acid of phosphorus or a phosphoric ester of ethylene glycol and in the presence of ethylene glycol.

Process for the manufacture of glycol monoethers

This invention relates to the method for making ethylene oxide, characterized by the fact that ethylene oxide in the gaseous state is made to react with anhydrous gaseous hydrochloric acid, with the reaction medium likewise being maintained in the gaseous state during the reaction.

Growing community of inventors

Grenoble, France

Elie Ghenassia