Elf Atochem S.a.

Arkema France

Si Group, Inc.

Jean-Marc Sage

Laurent Wendlinger

Eric Lacroix

Didier Judas

Philippe Blondel

Philippe Maj

Philippe Bonnet

Manuel Hidalgo

Jean-Michel Bossoutrot

Eric Jorda

Michael Werth

Didier Juhue

Olivier Julien

Arnaud Tedoldi

Thierry Brifaud

Arnaud Radigue

The present invention relates to an improved process for preparing hydrazine hydrate from the azine of methyl ethyl ketone obtained from methyl ethyl ketone by oxidizing ammonia with hydrogen peroxide in the presence of an activator, characterized in that it comprises a step of recycling the methyl ethyl ketone oxime purge.

Process for preparing hydrazine hydrate with oxime recycling

The present invention relates to an improved process for preparing hydrazine hydrate from the azine of methyl ethyl ketone obtained from methyl ethyl ketone by oxidizing ammonia with hydrogen peroxide in the presence of an activator, characterized in that it comprises a step of recycling the pyrazoline-class heterocycles purge.

Process for preparing hydrazine hydrate with pyrazoline recycling

A process for synthesizing an azo compound by oxidation of a hydrogen compound in the presence of a catalyst and a compound of formula (I) is described in which R, Rand R(R)(R)C(PO(R))&#x2003;&#x2003;(I)are as defined. The use of a compound of formula (I) as complexing agent for a catalyst is also described.

Process for synthesizing azo compounds

A process is provided for synthesizing an azo compound, such as AIBN, by oxidation of a hydrazo compound using hydrogen peroxide. This process comprises a step of adding to the reaction medium a particular reducing agent, such as hydrazine.

Method of synthesis of azo compounds

The invention relates to novolac alkylphenol resins having a low level of free alkylphenol, a method for the production thereof, and the use thereof as tackifying resins and reinforcing resins for rubbers. The resins may be used advantageously in the production of tires.

Novolac alkylphenol resin formed with fatty acid

Pulverulent polyamide composition for the coating of metal substrates

In order to manufacture pentafluoroethane (F125) and/or 1,1,1,2,3,3,3-haptafluoropropane (F227ea), a trifluoromethane gas stream is subjected to pyrolysis and then the mixture of gases which result from this pyrolysis is brought into contact with a fluorination catalyst.

Process for the manufacture of hydrofluoroalkanes

To avoid the formation of acidity in an F125 containing olefins, a radical scavenger and/or an acidity scavenger is added to it.

Process for stabilization of pentafluoroethane

In order to remove olefinic impurities present in a hydrofluorocarbon such as pentafluoroethane (R-125), the impure hydrofluorocarbon is treated with oxygen in the absence of catalyst or of active charcoal. The process is well suited to the purification of fluoroethanes and, more particularly, to that of pentafluoroethane.

Process for the purification of saturated hydrofluorocarbons

Polyetheresteramides, characterized in that they comprise both of the following repeating entities: ##STR1## in which X represents the residue of a polyamide-diacid oligomer with an Mn of between 300 and 8000, Y represents the residue of a polyetherdiol with an Mn of between 200 and 5000, and Z represents the residue of a polyetherdiamine with an Mn of between 200 and 5000, wherein the proportion by mass of the entities Z resulting from the condensation of the polyetherdiamine with respect to the total amount of the entities resulting from the polyetherdiol and polyetherdiamine, i.e. Z/(Z+Y), is between 1 and 50%. The polyetheresteramides according to the invention can be used as is and are suitable for the production of mouldings, extrudates, films, sheaths, or composite materials such as multi-layer film. They can also be mixed with other polymers and in particular with polyamides. Additives such as heat stabilizers, antioxidizing agents, dyes, inorganic fillers, or various organics can also be added to them.

Polymers comprising both polyamide-diacid/polyetherdiol blocks and

Copolyoxadiazoles of block type and process for their synthesis

The present invention relates to new polyamides comprising, on a mass basis: (a) 45 to 75% of an x,T unit, x being between 4 and 12 inclusive, the x,T unit being the condensation product of a diamine having x carbon atoms and of terephthalic acid, and (b) 55 to 25% of an aliphatic unit -HN-(CH.sub.2).sub.n -CO, n being between 6 and 14 inclusive. and the terpolyamides obtained by including a monomeric unit (c) such as the unit 6 or 6,I as a replacement for part of the aliphatic unit (b). The polyamide compositions thus obtained exhibit a Tg lower than 130.degree. C., a Tm higher than 230.degree. C. and a good crystallizability.

Polyamides and objects obtained from them

Copolyamides having high crystallinity over the whole composition range, a melting enthalpy .DELTA.H&gt;3.5 cal/g and a melting point T.sub.M higher than 270.degree. C. and articles manufactured therefrom are disclosed, said copolyamides comprising, by moles:

High melting point crystalline polyamides

A process for the manufacture of polyamides consisting essentially of the stages of:

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Oullins, France

Jean-Marc Sage