Atochem

Elf Atochem S.a.

Produits Chimiques Ugine Kuhlmann

Gerard Krempf

Bertrand Collier

Pierre Tellier

Jean-Pierre Schirmann

Elie Ghenassia

Richard Audry

Jean-Pierre Pleuvry

Francois Fine

William Jequier

Jackie Perono

Solutions of hydrazine hydrate are vaporized, without any concomitant decomposition thereof, by heating such solutions, in the liquid phase, under conditions as to effect the decompression or volatilization thereof; this process is particularly applicable for the vaporization of that hydrazine hydrate solution contained in the reboiler of a column wherein the hydrolysis of an azine R.sub.1 R.sub.2 C.dbd.N-N.dbd.CR.sub.1 R.sub.2 is carried out, with recovery of hydrazine hydrate at the base of the column and of a ketone, R.sub.1 R.sub.2 C.dbd.O, at the column head.

Vaporization of solutions of hydrazine hydrate

Azines, well suited for hydrolysis into hydrazine, are prepared in high yields by reacting ammonia, aqueous hydrogen peroxide and a carbonyl compound reactant in the presence of a catalytically effective amount of a catalyst medium therefor, i.e., an aqueous solution of ammonium acetate and acetamide or of acetamide and acetic acid, but in the absence of CO.sub.2.

Azine synthesis in the absence of CO.sub.2

In the process of producing hydroxylated polybutadiene from a diene monomer in the presence of hydrogen peroxide and a solvent, wherein the solvent is recovered by distillation for reuse; after separation of the hydroxylated polybutadiene from mixture containing such solvent and reaction impurities, the improvement comprising subjecting said mixture to the action of an alkali metal hydroxide or a hydrazine prior to distillation.

Process for producing hydroxylated polybutadiene

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.

Method for making ethylene chlorohydrin

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Lyons, France

Gerard Krempf