Rhodia Operations

François Metz

Olivier Buisine

Vincent Schanen

Bernard Besson

Laurent Saint-Jalmes

Laurent Garel

Denis Revelant

Stephan Verdier

Martine Vibert

Corine Cochennec

Marie Chauve

Valéry Dambrin

Claude Mercier

The invention relates to a method for producing a fluorine- and sulphur-bearing compound of formula F&#x2014;SO&#x2014;R (I) or F&#x2014;SO&#x2014;R (II), comprising the reaction, in the presence of water, of at least one salt providing a fluoride anion and at least one halgoenosulfoxide compound of formula X&#x2014;SO&#x2014;R' (I0) from a halogenosulfonyl compound of formula X&#x2014;SO&#x2014;R&#x2032; (II0), in which X is a halogen atom other than fluorine and R and R&#x2032; are each a group linked by a covalent bond to the sulphur atom, said bond linking the sulphur atom with a nitrogen atom. The invention also relates to a method for producing salts of a fluorine- and sulphur-bearing compound of formula F&#x2014;SO&#x2014;R (I) or F&#x2014;SO&#x2014;R (II) which are advantageously used as electrolyte salts, as precursors of antistatic agents or as surfactant precursors.

Method for producing a fluorine- and sulfur-bearing compound and salts thereof in an aqueous medium

The present invention relates to a process for recovering a metal salt of an electrolyte dissolved in a matrix, said process consisting in subjecting the electrolyte to a liquid extraction with water.

Process for recovering an electrolyte salt

The invention concerns a method for preparing an oxysulphide and fluorinated derivative, said method comprising the reacting, in the presence of an organic solvent, of: i) at least one compound of formula Ea-COOR (I), in which Ea represents the fluorine atom or a group having 1 to 10 carbon atoms chosen from fluoroalkyls, perfluoroalkyls and fluoroalkenyls and R represents hydrogen, a monovalent cation or an alkyl group, and ii) a sulphur oxide, said method being such that the initial molar ratio (sulphur oxide/compound of formula (I)) is less than 0.4 and the concentration of sulphur oxide dissolved in the reaction medium is kept constant for the entire duration of the reaction to a value of between 0.2% and 3% by weight by means of continually adding said sulphur oxide to the reaction medium.

Method for preparing oxysulphide and fluorinated derivatives by sulphination

The preparation is described of a compound of formula (I) comprising an &#x2014;SOF function by reacting a compound of formula (II) with a fluorinating agent selected from hydrofluoric acid and an ionic fluoride of a monovalent or divalent cation:R&#x2014;SOF&#x2003;&#x2003;(I)R'&#x2014;SOX&#x2003;&#x2003;(II)where R is selected from the groups R1, R2 and R3:

Process for fluorination of sulphonyl halide compounds

A method for preparing a compound of formula (I) which is a vanillin derivative, of dimer type, called 3-(4-hydroxy-3-methoxybenzyl)-4-hydroxy-5-methoxybenzaldehyde, such method comprising a reaction of vanillin and vanillyl alcohol in the presence of a base. 

Method for preparing a vanillin derivative

The present invention relates to a method for preparing a highly pure trifluoromethanesulphinic acid. The method of the invention for preparing a highly pure trifluoromethanesulphinic acid, starting from an aqueous mixture comprising a trifluoromethanesulphinic acid salt, a trifluoroacetic acid salt and saline impurities resulting from the method for preparing same, is characterized in that said mixture is subjected to the following operations: &#x2014;acidification such that the trifluoroacetic acid salt and the triflinic acid salt are released in an acid form, &#x2014;separation of the trifluoroacetic acid and trifluoromethanesulphinic acid by distillation enabling the trifluoroacetic acid to be recovered at the top of the distillation and the trifluoromethanesulphinic acid to be recovered at the bottom of the distillation, &#x2014;separation by distillation of the trifluoromethanesulphinic acid present in the distillation residue previously obtained.

Method for preparing trifluoromethanesulphinic acid

The subject of the present invention is a method for separating a carboxylic acid in salified form bearing at least one halogen atom at the &#x3b1; position of the carbonyl group from a medium comprising it. The method according to the invention, for separating a carboxylic acid in salified form bearing at least one halogen atom at the &#x3b1; position of the carbonyl group from an aqueous medium comprising it, is characterized by the fact that the latter is brought into contact with an onium salt leading to the formation of two phases: an organic phase comprising the salt resulting from the reaction of the salt of the carboxylic acid bearing at least one halogen atom at the &#x3b1; position of the carbonyl group and of the onium salt leading to the displacement of the cation from the carboxylic acid by the onium, an aqueous phase comprising the various salts, in particular the one resulting from the reaction of the cation of the carboxylic acid with the anion of the onium, and by the fact that the organic and aqueous phases are then separated and that the onium salt of the carboxylic acid is recovered from the organic phase.

Method for separating a carboxylic acid in salified form bearing at least one halogen atom

The present invention relates to a method for preparing a salt of trifluoromethanesulphinic acid termed 'triflinic acid'. More specifically, the invention relates to a method for preparing a highly pure triflinic acid salt. The method of the invention for preparing a highly pure triflinic acid salt, starting from an aqueous mixture comprising the latter combined with a trifluoroacetic acid salt and saline impurities resulting from the method for preparing same, is characterized in that said mixture is subjected to the following operations: &#x2014;first controlled acidification such that the trifluoroacetic acid salt is essentially released in the acid form thereof, the majority of the triflinic acid remaining in a salified form, &#x2014;optional separation of the salts originating from the acid having been used for the acidification and recovery of an aqueous phase, &#x2014;separation of the trifluoroacetic acid from the separated aqueous phase comprising the alkaline salt of triflinic acid, trifluoroacetic acid, triflinic acid and the excess strong acid, therefore resulting in an aqueous phase depleted of trifluoroacetic acid but comprising the alkaline salt of triflinic acid, &#x2014;recovery of the alkaline salt of triflinic acid from the aqueous phase.

Method for preparing a trifluoromethanesulfinic acid salt

The subject of the present invention is a method for the sulphonylation of a hydroxylated organic compound. The invention relates more particularly to a method for the trifluoromethanesulphonylation of a hydroxylated organic compound. The invention is especially intended for perfluorinated aliphatic hydroxylated compounds. The method of the invention for the sulphonylation of a hydroxylated organic compound is characterized in that it comprises reacting said compound with a sulphonylation agent in an organic medium and in the presence of a heterogeneous inorganic base.

Method for the sulfonylation of a hydroxylated organic compound

The invention relates to a method for preparing difluoroacetic acid and the salts thereof. The invention also relates to the preparation of difluoroacetyl fluoride used as an intermediate product in the preparation of difluoroacetic acid. The method for preparing difluoroacetic acid according to the invention is characterized in that the same comprises the step of preparing difluoroacetyl fluoride by reacting dichloroacetyl chloride with hydrofluoric acid in a gaseous phase and in the presence of a chromium-based catalyst, followed by the step of hydrolysing the difluoroacetyl fluoride thus obtained.

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Irigny, France

François Metz