Rhodia Operations

Rhone-poulenc Chimie

Rhodia Fiber & Resin Intermediates

Aventis Animal Nutrition S.a.

Filtrauto

R. P. Fiber & Resin Intermediates

Rhone-poulenc Fiber & Resin Intermediates

Dominique Horbez

Robert M Perron

Marc Huser

Stephanie Foucher

Philippe Marion

Philippe Leconte

Laurent Garel

Jean Grosbois

Emmanuel Rohart

Denis Revelant

Julien Hernandez

Simon Ifrah

Eric Fache

Virginie Harle

Michael Lallemand

Edith Canivenc

Enrico Drioli

Olivier Favre-Bulle

Philippe Morel

Guy Monsallier

Fan Jiang

Stéphanie Normand

Pascal Metivier

Alex Chamard

Stéphanie Foucher

Lama Itani

Jerome Pierrard

Christophe David

Alain Storck

Stephane Streiff

Morad Assam

Renate Schwiedernoch

The present invention relates to an electrochemical method for converting an amino acid and/or its salts to an amine and/or a nitrile. The total yield and selectivity of amine and nitrile obtained by the method according to the present invention is higher than prior art when the reaction medium has a high concentration of amino acid and/or its salts at the beginning of the reaction.

Electrochemical method for preparing an amine and/or a nitrile

A process for the recovery of sodium sulfate from water, in particular from water deriving from a silica manufacturing process.

Process for the recovery of sodium sulfate

The composition of the invention is based on oxides of cerium, of zirconium and of at least one rare earth metal other than cerium, with a cerium oxide content of greater than 50% by weight and it has, after calcination at 1000&#xb0; C. for 4 hours, a specific surface area of at least 20 m/g and an amount of mobile oxygen between 200&#xb0; C. and 400&#xb0; C. of at least 0.8 ml O/g. It is prepared by a process in which, in a reactor, a mixture of compounds of cerium, of zirconium and of the other rare earth metal is reacted continuously with a basic compound with a residence time of the reaction medium in the mixing zone of the reactor of at most 100 milliseconds; the precipitate is heated then brought into contact with a surfactant before being calcined.

Composition based on oxides of cerium, of zirconium and of another rare earth metal with high reducibility, preparation process and use in the field of catalysis

A process for extraction of ferulic acid present in an aqueous phase, obtained by treatment of at least one plant material, and also containing polysaccharides, is described, said process comprising at least the following steps:

Optimized process for extraction of ferulic acid with pretreatment

The invention describes a method for separating a mandelic compound in salified form from an aqueous reaction medium resulting from the condensation reaction of a hydroxylated aromatic compound with glyoxylic acid in a basic medium, said method comprising a) decanting said reaction medium in such a way as to recover an organic phase formed from the excess of said aromatic compound and an aqueous phase formed from said mandelic compound and a quantity of the excess of said aromatic compound and b) bringing said aqueous phase into contact with an adsorbent support, resulting in the selective adsorption of said aromatic compound and the recovery of an aqueous flow comprising said mandelic compound in salified form, which is subjected to an oxidation step before being converted into hydroxyaromatic aldehyde by electrodialysis.

Method for separating mandelic compounds in salified form and use of same for preparing aromatic aldehyde

The invention relates to a device for dispensing a liquid additive into a fuel circulation circuit for an internal combustion engine, comprising a reservoir () of liquid additive allowing an additive to be distributed into the fuel circulation circuit by means of a distribution line (), characterized in that it comprises an additive chamber () in communication with the fuel circulation circuit and at least one wall () that is mobile and fluidtight between said additive chamber and the additive reservoir which, on the one hand, provides a fluidtight division and, on the other hand, maintains equal pressure between the additive in the additive reservoir and the fuel in the additive chamber.

Device for dispensing an additive

The invention concerns a method for extracting by electrodialysis a compound comprising at least amine functions capable of protonation from a liquid medium. More particularly it concerns a method for extracting, and separating at least the monomers comprising amine functions capable of protonation from a liquid medium derived from the hydrolysis of polyamides. The method of extraction from a liquid medium consists in subjecting to protonation the amine function(s) of the compounds to be extracted by adjusting the pH of the medium and in separating the compounds by passing them through a cationic membrane under the effect of an electric current. The invention is particularly applicable in processes for the chemical stabilisation of polyamides such as the PA 66 PA 6.

Method for extracting amine compounds from a liquid medium

The present invention relates to a process for isolating, by membrane electrodialysis, a catalyst from a solution containing it. More precisely, it relates to the isolation of a catalyst used in a homogeneous phase molecular oxidation reaction. The invention consists of a process for isolating a homogeneous catalyst dissolved in a mixture also containing at least one aliphatic diacid, characterized in that the catalyst contains cobalt and the isolation is performed by membrane electrodialysis.

Method for separating a catalyst by membrane electrodialysis

Industrial scale process for the preparation of 2-hydroxy-4-methylbutyric acid using a nitrilase

Catalyst compounds comprising at least one transition metal in an oxidation state of 0 to 1, and at least one monodentate or bidentate water-soluble phosphine, well suited for the hydrocyanation of ethylenically unsaturated compounds, are electrochemically synthesized, by electrolyzing an aqueous solution catholyte (contained in the cathode compartment of any suitable electrolytic cell) comprising at least one transition metal compound and at least one monodentate or bidentate water-soluble phosphine, advantageously at least one phosphine having the following formulae (I) and/or (II):

Electrochemical synthesis of transition metal/phosphine catalysts

Catalyst compounds comprising at least one transition metal having an oxidation number of 0 or 1 and at least one sulfonated phosphine are electrochemically synthesized, by electrolyzing an aqueous solution catholyte (contained in the cathode compartment of any suitable electrolytic cell) comprising at least one transition metal compound and at least one sulfonated phosphine.

Electrochemical synthesis of transition metal/phosphine catalyst

Cerous 3.sup.30 values are converted into ceric 4.sup.+ values, in a conventional separator-free electrolytic cell, by emulsifying an organic phase containing a cerium 4.sup.+ extractant in an aqueous sulfuric phase which includes the cerium 3.sup.+ values to be converted; simultaneously electrolytically oxidizing the cerium 3.sup.+ values into cerium 4.sup.+ values in a zone of electrolysis including an anode and a cathode, whereby the cerium 4.sup.+ values formed are liquid/liquid extracted into the organic phase; separating the resulting emulsion into an aqueous phase and an organic phase enriched in cerium 4.sup.+ values; and recovering the enriched organic phase.

Electrolytic oxidation of cerium 3.sup.+  values to cerium 4.sup.+

Growing community of inventors

Franconville, France

Dominique Horbez