Societe Nationale Elf Aquitaine (production)

Centre National De La Recherche Scientifique

Ceca S.a.

Université De Poitiers

Fagorbrandt Sas

Joel Barrault

Christian Forquy

Raymond Maurel

Jacques Lucien

Michel Guisnet

Yannick Pouilloux

Antoine Rousseau

Jean-Michel Tatibouet

Francois Jerome

Francis Autin

Jean-Paul Chevrier

Stephane Pasquiers

Mongi Seffen

Rodolphe De Sousa

Martine Boulinguiez

François Fresnet

Stéphane Pasquiers

Cécile Ayrault

The present invention concerns a method for the synthesis of glycerol dithiocarbamates or bis-dithiocarbamates (GDTCs) in which a reaction medium comprising (1) a carbonate selected from diethyl carbonate, dimethyl carbonate and ethylene or propylene carbonate associated with a glycerol type polyol in the presence of a basic catalyst or (2) a cyclic carbonate comprising five ring members, in a solvent medium, is supplemented with a primary or secondary amine in the presence of carbon disulphide, and the GDTC formed is recovered. In particular, a glycerol type polyol is brought into the presence of diethyl carbonate in the presence of a catalyst, then a primary or secondary amine is added to the reaction medium in the presence of carbon disulphide, and the GDTC formed is recovered. The invention can be used for one-step synthesis of glycerol dithiocarbamates directly from glycerol as the starting material and solvent. This method involves glycerol, diethyl carbonate, carbon disulphide (CS) and a primary or secondary amine to produce glycerol dithiocarbamates; the glycerol/NaOH phase can be recycled 6 times without a noticeable drop in yield; the ethyl acetate is also recycled after each extraction.

Method for preparing dithiocarbamates in particular from polyols of the glycerol type

A device for catalytic treatment of cooking smells includes a monolithic support (), including passage channels () for cooking fumes and active treating particles deposited on the monolithic support (), an apparatus for generating a discharge plasma () arranged on either side of the monolithic support.

Device for catalytic treatment of smells and filtering hood equipped therewith

A process for the production of a primary alkylamine or a dimethylalkylamine in a single stage comprising heating a reaction medium comprising a long chain carboxylic acid ester with ammonia and hydrogen in the presence of a mixed catalyst of the oxide-metal type; said oxide being titanium dioxide and the metal being a combination of copper and cobalt or of copper, chromium, and cobalt; and the mixed oxide-metal catalyst.

Process for the production of long chain alkylamines and

In a process for the production of methyl mercaptan by heating a gas comprising carbon monoxide and/or carbon dioxide, hydrogen sulphide and hydrogen in contact with a catalyst based upon a heavy metal sulphide, with recycling of the gas fraction which has not reacted, the gas to be recycled has removed from it water which it contains following the reaction in contact with the catalyst.

Process for the production of methyl mercaptan from oxides of carbon

The invention concerns a new process for the production of primary and secondary mercaptans. The invention is based on the fact that it is possible to cause an hydrogen exchange between a thioaldehyde or a thioketone and a mercaptan with very good selectivity and conversion yields.

Process for the production of mercaptans

Preparation of a thiophene by the action of H.sub.2 S on an organic substance containing oxygen or sulphur. The substance which is used is an unsaturated carbonyl or thiocarbonyl compound, particularly an aldehyde, thioaldehyde, ketone or thioketone. The reaction preferably takes place between 250.degree. and 500.degree. C. on a catalyst of the alumina type containing an alkali or alkaline earth oxide. The process permits the unsubstituted or substituted thiophene to be obtained with high yields and high degrees of selectivity, exceeding 70%.

Process for preparing thiophenes

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Liguge, France

Joel Barrault