Rhone-poulenc Chimie

Rhone-poulenc Industries

Rhodia Fiber & Resin Intermediates

Rhone-poulenc Sante

Rhodia Chimie

Rhone-poulenc S.a.

Rhone-poulenc-textile

Rhodia Polyamide Intermediates

Rhone-poulenc Fiber & Resin Intermediates

Michel Costantini

Michel Jouffret

Eric Fache

Dominique Laucher

Adrien Dromard

Jean-Michel Popa

Francoise Igersheim

Daniel Michelet

Daniel Manaut

Michel Gubelmann

Leon Krumenacker

Pierre-Etienne Bost

Jean-Pierre Lecomte

Philippe Leconte

Jean-Louis Guth

Michel Spagnol

Laurent Gilbert

Eric Garcin

Guy Lartigau

Roland Nantermet

Gilbert Marin

Daniel Nivert

Jean Claude Brunie

Noel Crenne

Annie Lopez

The present invention relates to the treatment of the reaction mixtures resulting from an oxidation reaction of cyclohexane to adipic acid and more particlarly to the separation of the various constituents of the said mixtures and to the purification of the adipic acid.

Method for separating and purifying adipic acid

The present invention relates to the oxidation, by means of oxygen or a gas containing it, of hydrocarbons to the corresponding carboxylic acids, alcohols and/or ketones or of alcohols and/or ketones to the corresponding carboxylic acids. It consists more precisely in a process for oxidizing hydrocarbon, alcohol and/or ketone, using oxygen or a gas containing it, in liquid phase and in the presence of a catalyst dissolved in the reaction medium, characterized in that the catalyst comprises a soluble manganese compound and at least one soluble chromium compound.

Hydrocarbon, alcohol and/or ketone oxidation method

Method for separating and purifying carboxylic acid derived from the direct oxidation of a hydrocarbon

The present invention relates to a process for the crystallization of carboxylic acid, more particularly adipic acid, and a process for manufacturing crystalline carboxylic acid, more specifically a process for treating the reaction medium resulting from the direct oxidation of a hydrocarbon into carboxylic acid such as adipic acid, for example. More specifically, the invention relates to the crystallization of adipic acid from an organic solvent, thus removing the organic impurities contained in the said acid and thus optionally facilitating its purification by a crystallization from water.

Method for crystallizing carboxylic acid

Carboxylic acids, e.g., adipic acid, are more selectively prepared by oxidizing cyclohexane with oxygen or an oxygen-containing gas, in liquid phase, in a solvent reaction medium which comprises a polar protic or aprotic solvent, and also in the presence of a catalytically effective amount of catalyst values dissolved in said solvent reaction medium, the catalyst values comprising at least one solvent-soluble cobalt compound and at least one solvent-soluble chromium compound.

Co/Cr catalyzyed oxidation of cyclohexane

Phenol compound hydroxylation method

Method of recycling a catalyst in a reaction involving the direct

Phenolic compounds, e.g., phenol, are hydroxylated, preponderantly into the para-isomer, e.g., hydroquinone, by reaction with hydrogen peroxide in the presence of an effective amount of a strong acid and a catalytically effective amount of a keto compound having the formula (II): ##STR1## in which R.sub.1 and R.sub.2, which may be identical or different, are each a hydrogen atom or an electron-donating group; n.sub.1 and n.sub.2, which may be identical or different, are numbers equal to 0, 1, 2 or 3, with the proviso that the two carbon atoms located at the .alpha.-position with respect to the two carbon atoms bearing the --CO group may be bonded together via a valence bond or via a --CH.sub.2 -- group, thereby forming a keto-containing ring member which may either be saturated or unsaturated.

Hydroxylation of phenolic compounds

p-Dihydroxylated aromatic compounds are prepared via the oxidation of p-fuchsones, the latter advantageously being synthesized by reacting a phenolic compound having at least one hydrogen atom in the para-position to the hydroxyl function with a non-enolizable ketonic compound, in the presence of a catalytically effective amount of an acid catalyst and, optionally, a cocatalytically effective amount of an ionizable sulfur-containing compound.

Preparation of p-fuchsones and synthesis of p-dihydroxylated aromatic

Preparation of P-fuchsones and synthesis of P-Dihydroxylated aromatic

Phenolic compounds, e.g., the phenols and phenol ethers, are selectively hydroxylated whereby the amounts of the final product para isomer are enhanced, for example in favor of hydroquinone versus pyrocatechol in the event of the hydroxylation of phenol, by reacting such phenolic compounds with hydrogen peroxide, advantageously in a polar, aprotic, organic solvent reaction medium, in the presence of a catalytically effective amount of a sulfonated polymer and a cocatalytically effective amount of an aromatic ketone compound.

o-Dihydroxylated aromatic compounds, for example pyrocatechol, are selectively prepared by reacting an o-fuchsone with an oxidizing agent, for example hydrogen peroxide, optionally in the presence of a catalytically effective amount of an acid catalyst.

Preparation of o-dihydroxylated aromatic compounds via oxidation of

Calcined silica/oxide zeolites, characteristically MFI stannozeosilites or zirconozeosilites, well adopted for catalyzing the H.sub.2 O.sub.2 hydroxylation of phenols or phenol ethers, have the formula (I):

Stannozeosilite/zirconozeosilite zeolites and catalytic hydroxylation of

Growing community of inventors

Lyons, France

Michel Costantini