Arkema France

Atofina

Arkenna France

Jean-Michel Bossoutrot

Jean-Marc Sage

Pierre-Marie Sedat

Paul Bourdauducq

Jean-François Devaux

Myriam Gerbier

Jose Luis Orozco

Process for producing aminocarboxylic acid of formula (I): NH—CH—(CH)—COOH (I) including: (i) reacting the unsaturated carboxylic acid of formula (II): CH═CH—(CH)—COOH (II) with hydrogen bromide to form the ω-bromoalkanoic acid of formula (iii): Br—CH—(CH)—COOH (III); (ii) reacting the ω-bromoalkanoic acid obtained with ammonia in aqueous solution to form a reaction mixture; (iii) separating the reaction mixture of the aminocarboxylic acid of formula (I) and an aqueous solution rich in ammonium bromide; (iv) bringing the aqueous solution rich in ammonium bromide into contact with sodium hydroxide to form ammonia and an aqueous solution rich in sodium bromide; (v) purifying the aqueous solution rich in sodium bromide; (vi) bringing the purified aqueous solution rich in sodium bromide into contact with chlorine to form bromine and an aqueous solution rich in sodium chloride; (vii) reacting the bromine with hydrogen to form hydrogen bromide; and (viii) recycling the hydrogen bromide to step (i).

Process for manufacturing aminoundecanoic acid and aminodecanoic acid

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 present invention relates to a process for preparing concentrated alkali metal hypochlorite solutions. One subject of the invention is more particularly a process for preparing concentrated bleach which may have a chlorine content of greater than 100 chlorometric degrees, and that has a low content of chlorates.

Process for preparing concentrated alkali metal hypochlorite solutions

The subject of the invention is a process for the preparation of fluoroolefin compounds. It relates more particularly to a process for manufacturing a (hydro)fluoroolefin compound comprising (i) bringing at least one compound comprising from three to six carbon atoms, at least two fluorine atoms and at least one hydrogen atom, provided that at least one hydrogen atom and one fluorine atom are located on adjacent carbon atoms, into contact with potassium hydroxide in a stirred reactor, containing an aqueous reaction medium, equipped with at least one inlet for the reactants and with at least one outlet, in order to give the (hydro)fluoroolefin compound, which is separated from the reaction medium in gaseous form, and potassium fluoride, (ii) bringing the potassium fluoride formed in (i) into contact, in an aqueous medium, with calcium hydroxide in order to give potassium hydroxide and to precipitate calcium fluoride, (iii) separation of the calcium fluoride precipitated in step (ii) from the reaction medium and (iv) optionally, the reaction medium is recycled after optional adjustment of the potassium hydroxide concentration to step (i).

Process for the preparation of fluoroolefin compounds

The invention relates to a method for preparing olefin fluorine compounds. Specifically, the invention relates to a method for producing a (hydro)fluoroolefin compound, including: (i) in an agitated reactor provided with at least one reactant inlet and at least one outlet, contacting, with potassium hydroxide in an aqueous reaction medium, at least one compound containing three to six carbon atoms, at least two fluorine atoms, and at least one hydrogen atom, with the proviso that at least one hydrogen atom and one fluorine atom are located on adjacent carbon atoms, so as produce the (hydro)fluoroolefin compound, separated in a gaseous state from the reaction medium and from potassium fluoride; (ii) in an aqueous medium, contacting the potassium fluoride formed in step (i) with calcium hydroxide in a second reactor so as to produce potassium hydroxide and to precipitate calcium fluoride; (iii) separating the calcium fluoride precipitated in step (ii) from the reaction medium; and (iv) optionally recirculating the reaction medium after optionally recirculating the reaction medium after optionally adjusting the concentration of potassium hydroxide in step (i), characterized in that potassium hydroxide, with regard to the reaction medium of step (ii), is between 10 and 35 wt % of the weight of the water/potassium hydroxide mixture of the medium.

Method for preparing olefin fluorine compounds

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.

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Chaponost, France

Jean-Michel Bossoutrot