Elf Atochem S.a.

Atofina

Elf Antar France

Paul Bourdauducq

Jean-Luc Couturier

Jean-Pierre Schirmann

Paul Maldonado

Laurent Germanaud

Jean-Michel Bossoutrot

Eric Monflier

The invention concerns a method for making aminoguanidine bicarbonate from an aqueous solution of cyanamide and an aqueous solution of hydrazine in the presence of CO. The invention is characterised in that it consists in proceeding with an amount of cyamide slightly higher than the stoichiometric quantity. The invention also concerns quasi-spherical agglomerates of aminoguanidine bicarbonate crystals.

Aminoguanidine bicarbonate with particular properties and method for making same

The invention concerns a method for preparing methyl ethyl ketone azine which consists in: (a) reacting ammonia, hydrogen peroxide and methyl ethyl ketone in the presence of a working solution to form an azine; (b) separating the working solution and the azine possibly containing methyl ethyl ketone which has not reacted and butanol-2; (c) recycling the working solution to step (a) after optional treatment; (d) separating the methyl ethyl ketone and the butanol-2 from the azine. The butanol-2 of the flow in step (d) is either purged or dehydrogenated in MEK and recycled at step (a).

Method for preparing hydrazine hydrate

Process for the preparation of 4-amino-1,2,4-Triazole

The invention concerns a method for preparing an azoiminoether hydrochloride which consists in reacting an azonitrile with an alcohol and hydrochloric acid in an aromatic solvent, wherein the molar ratio R&equals;HCl/azonitrile is >2 when the alcohol is methanol and >3 when the alcohol is ethanol or a higher alcohol. The invention also concerns a method for preparing an azocarboxylic acid ester which consists in the synthesis of an azoiminoether hydrochloride by the inventive method and, hydrolysis in the presence of the resulting azoiminoether hydrochloride. Said methods enable to obtain liquid composition of azocarboxylic acid esters. The invention further concerns mixed azoiminoether salts of formula (II&prime;). The invention also concerns mixed azoiminocarboxylic acid esters corresponding to the formula (III&prime;).

Process for preparing azoiminoethers and azocarboxylic acid esters and novel azocboxylic acid mixed esters

Fuel composition for diesel engines containing oxygenated compounds

The present invention relates to a process for the preparation of products of formula (1): ##STR1## in which R denotes H or an alkyl group containing from 1 to 10 carbon atoms, it being possible for this alkyl group to be substituted by one or more aryl, heteroaryl, hydroxyl or alkenyl groups, in which process hydrazine is reacted with a deficiency of carboxylic acid RCOOH and then the water of reaction and optionally the water of dilution of the hydrazine and of the acid is removed. It is particularly useful for preparing 4-amino-1,2,4-triazole.

Process for the preparation of 4-amino-1,2,4-triazole

A process for the preparation of octadienols, comprising the hydrodimerization reaction of 1,3-butadiene with water in the presence of a transition metal in the metal form or in the form of a compound of the said metal, of a water-soluble tertiary or quaternary phosphorus-containing compound and of at least one nitrogen-containing compound selected from the group consisting of a tertiary amine and a quaternary ammonium salt of general formula (I) or (II): ##STR1## in which R.sub.p, R.sub.q and R.sub.s are identical or different and each is a methyl or ethyl group; R.sub.r is an alkyl group containing from 6 to 22 carbon atoms; X is a counter-anion selected from the group consisting of

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Chaponost, France

Paul Bourdauducq