Solvay Sa

Solvay (societe Anonyme)

Solvay

Alain Lambert

Vincent Wilmet

Max Josef Braun

Francine Janssens

Philippe Krafft

Olivier Buyle

Lionel Casaubon Seignour

Stefan Palsherm

Uta Claassen

V&eacute;ronique Mathieu

Charles-Marie Anciaux

Matthias Marek

Véronique Mathieu

Jean-Marie Blaude

Miriam Heyd

Jan Schostag

Harald Krueger

Benoit Gosselin

The present invention concerns a process for the reduction of content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or concentrated sulfuric acid. The invention further concerns a process for the manufacture of carboxylic acid anhydrides comprising the process for the reduction of content of carboxylic acids and derivatives thereof from oleum, disulfuric acid or concentrated sulfuric acid.

Reduction of content of carboxylic acids and derivatives thereof in oleum, disulfuric acid or concentrated sulfuric acid

Process for synthesizing a chemical, in particular an agriculturally or pharmaceutically active compound, including: a first step comprising reacting a carboxylic acid halide with a vinyl ether to prepare a halogenated precursor of an alkenone; a second step comprising eliminating hydrogen halide from such precursor to form an alkenone, preferably by thermolysis under specific conditions; and a third step which uses the formed alkenone as a building block to synthesize the chemical. First step may be done in a liquid reaction medium comprising an alkenone or a halogenated alkenone precursor, or in a liquid reaction medium in turbulent state, specifically by creation of gas bubbles of the carboxylic acid halide herein. Second step may include a flash thermolysis, vacuum thermolysis, thermolysis under stripping with inert gas, and/or a thermolysis at a temperature from &#x3e;90&#xb0; C. to 120&#xb0; C. Third step preferably comprises reacting the alkenone with a nitrogen-containing compound.

Process for chemical synthesis from an alkenone made from a halogenated precursor

Process for preparing an alkenone, which comprises (a) reacting a carboxylic acid halide with a vinyl ether by introducing vinyl ether into a liquid reaction medium containing carboxylic acid halide to form a halogenated precursor of the alkenone and (b) eliminating hydrogen halide from said precursor to form the alkenone.

Process for the manufacture of alkenones

Process for preparing an alkenone, which comprises the following steps: (a) providing a halogenated precursor of the alkenone; and (b) eliminating the hydrogen halide from said precursor to form the alkenone by a thermolysis treatment selected from the group consisting of flash thermolysis, vacuum thermolysis, and thermolysis under stripping with inert gas.

Process for obtaining a hydrofluoroalkane which is purified of organic impurities, according to which the hydrofluoroalkane containing organic impurities is subjected to at least one purification treatment chosen from

Process for obtaining a purified hydrofluoroalkane

Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, according to which a hydrofluoroalkane/hydrogen fluoride mixture is reacted with at least one chlorinated or chlorofluorinated precursor of the hydrofluoroalkane. Process for the preparation of a hydrofluoroalkane comprising such a separation, in combination with a catalytic reaction stage. Azeotropic compositions.

Process for separation of a mixture comprising at least one hydrofluoroalkane

Process for the separation of a mixture comprising at least one hydrofluoroalkane

Process for the separation of a mixture comprising at least one hydrofluoroalkane and hydrogen fluoride, processes for the preparation of a hydrofluoroalkane and azeotropic compositions

Method for separating a mixture comprising at least an hydrofluoroalkane and hydrogen fluoride, methods for preparing a hydrofluoroalkane and azeotropic compositions

Halohydrocarbons comprising at least 3 carbon atoms are obtained by batchwise reaction between a haloalkane and an olefin in the presence of a catalyst and a co-catalyst. The addition of at least some of the co-catalyst is carried out gradually. At least some of the co-catalyst is recovered with a view to its re-use.

Process for preparing halohydrocarbons in the presence of a co-catalyst

Hydrogen fluoride is separated from its mixtures with 1,1,1,3,3-pentafluorobutane by extraction using an organic solvent containing a 1,1,1,3,3-chloro(fluoro)butane.

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Beauvechain, Belgium

Alain Lambert