Isochem

Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Snpe

Pierre Le Gars

Henri R Delalu

Jacques Berthet

Antoine Gaset

Elisabeth Borredon

Sophie Thiebaud-Roux

Denis Souyri

Samedy Ouk

Cécile Duriche

The invention relates to a process for the synthesis of monochloramine by reaction of an ammonium chloride solution with a sodium hypochlorite solution. The sodium hypochlorite solution is basified beforehand with an inorganic base and the ratio of the concentration of ammonium chloride in the reaction medium to the concentration of sodium hypochlorite in the reaction medium is between 1 and 1.5. This ratio is preferably equal to 1.1.

Process for the synthesis of monochloramine

The present invention relates to a process for the selective decomposition of hydrazine in a hydrazine/substituted hydrazine/water mixture. A catalyst chosen from the group consisting of nickel supported on silica/alumina, the nickel-nickel oxide mixture supported on silica/alumina and rhodium supported on carbon is introduced into this mixture and then the mixture is heated at a temperature of between 60&#xb0; C. and 120&#xb0; C.

Process for the selective decomposition of hydrazine in a hydrazine/substituted hydrazine/water mixture

The invention relates to a process for the synthesis of aryl alkyl monoethers by reaction of a phenol compound, comprising one or more hydroxyl groups attached to the aromatic system, and of a dialkyl carbonate. It is a solvent-free process carried out at a pressure of between 0.93&times;10 Pa and 1.07&times;10 Pa, at a temperature of between 100&deg; C. and 200&deg; C., and in the presence of a catalyst chosen from the group consisting of alkaline carbonates and alkaline hydroxides. The dialkyl carbonate is added gradually to the reaction mixture.

Process for the synthesis of aryl alkyl monoethers

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Toulouse, France

Pierre Le Gars