Elf Atochem S.a.

Societe Nationale Elf Aquitaine

Societe Nationale Elf Aquitaine (production)

Atofina

Arkema France

Elf Aquitaine

Jean Ollivier

Michel Leconte

Francoise Quignard

Jean M Basset

Michele Larrouy

Jean-Marie Basset

Hubert Baptiste

Christian H Lagaude

Damien Drutel

Sylvie Lacombe

Georges Fremy

Emmanuel F Arretz

Rene Clair

Annie Commarieu

Alfred Mirassou

Claude Landoussy

Evelyne Banchereau

Denise Molines

Katsumi Tanaka

Mélanie Hebert

Jean-Luc Couturier

Gisele Haurat

Jeannine Suberlucq

Guy Souloumiac

Jean-Paul Laval

Emile Perez

Isabelle Rico

Marc Ferrigno

In the photochemical synthetic process in semi-continuous mode according to the invention, a reactor comprising two zones is used, the radiating portion of the lamp(s) being totally immersed in a first zone which is completely filled with reaction medium and spills off via an overflow into a second zone whose volume is sufficient to contain the volume of reaction medium originating from the first zone and corresponding substantially to the volume of the reagent(s) gradually introduced.

Semi-continuous photochemical method and device therefor

Process for purifying the hydrochloric acid obtained as by-product in the synthesis of MSA, characterized in that the gaseous flow of hydrogen chloride evacuated from the top of the synthesis reactor is placed in contact in a treatment column, counter-currentwise, with a flow consisting of an aqueous solution of an acid chosen from methanesulfonic acid, hydrochloric acid or a mixture of these two acids, at a temperature of between 80 and 130&#xb0; C.

Purification of hydrochloric acid obtained as by-product in the synthesis of methanesulfonic acid

In the process according to the invention for the manufacture of an alkanesulphonyl chloride RCH&#x2014;SOCl by oxidative chlorolysis of the corresponding mercaptan RCH&#x2014;SH, the mercaptan and water are introduced into the reaction mixture in the form of a dispersion of water in the mercaptan. This makes it possible to obtain both an alkanesulphonyl chloride of very good quality and a hydrochloric acid of commercial grade.

Method for making alkanesulphonyl chlorides

For the preparation of lactams comprising 6 to 12 carbon atoms from the corresponding cycloalkanone oximes by rearrangement according to the Beckmann reaction in the presence of acid, the process is characterized in that use is made of methanesulphonic acid.

Process for the preparation of lactams from the corresponding cycloalkanone oximes

The invention relates to a process for the preparation of cyclododecanone oxide consists in photochemically reacting cyclododecane, dissolved in chloroform, a nitrosating agent and hydrogen chloride in a virtually anhydrous medium, that is to say under conditions such that the water content in the reaction medium does not exceed 1000 ppm.

Photonitrosation of cyclododecane in chloroform in quasi-anhydrous medium

Process for the preparation of lauryllactam by photonitrosation of cyclododecane and beckmann rearrangement in the presence of methanesulphonic acid

In order to remove the methanesulphonyl chloride entrained by the gaseous HCl by-product, an amount of water ranging from 0.01 to 20%, relative to the mass of HCl to be treated, is injected into the HCl gas flow and the temperature is lowered to a value below or equal to 15&deg; C.

Purification of the hydrochloric acid by-product of the synthesis of methanesulphonic acid

For manufacturing an alkanesulphonyl chloride by photochemical reaction of an alkane with chlorine and sulphur dioxide, the light source used is a gallium-doped medium-pressure mercury lamp.

Process for the photochemical sulphochlorination of gaseous alkanes

The process for the purification of an alkanesulphonyl chloride (ASC) in order to reduce the sulphate content thereof consists in washing the alkanesulphonyl chloride with water or with an aqueous solution of an acid having a pH of between -0.57 and 7 and then in separating the alkanesulphonyl chloride thus purified from the aqueous phase. This purified ASC leads, by total hydrolysis, to alkanesulphonic acid with a low content of sulphuric acid.

Process for the purification of an alkanesulphonyl chloride and of the

The subject-matter of the invention is a process for the preparation of cyclododecanone oxime by photonitrosation of cyclododecane in the presence of hydrochloric acid, characterized in that the nitrosing agent is trichloronitrosomethane.

Process for the preparation of lauryllactam by photonitrosation of

A process for the preparation of organic compounds or polymers containing one or more sulphur atoms and including one or more double bonds in a hydrocarbon chain is described. An acyclic sulphur-containing olefin or an unsaturated sulphur-containing cyclic hydrocarbon undergoes a self metathesis reaction or a cross metathesis reaction with a non-sulphur-containing acyclic olefin or a non-sulphur-containing unsaturated cyclic hydrocarbon to produce novel olefins, novel dienes, and/or olefinic polymers containing one or more sulphur atoms.

Method for metathetically preparing sulphur containing polymers or

The invention relates to the preparation of alkanesulphonic acids by photo-oxidation of dialkyl disulphides. The procedure is carried out in solution in an alcohol using a light source irradiating between 200 and 320 nm.

Process for the preparation of alkanesulphonic acids

The invention relates to the preparation of alkanesulphonic acids by photooxidation of sulphur-containing derivatives (thiols, sulphides, disulphides). The operation is carried out in solution in aqueous or alcoholic acetonitrile, with a light source irradiating between 200 and 400 nm.

Preparation of alkanesulphonic acids by photooxidation of

A process for the preparation of alkanesulfonamides is disclosed. It comprises reacting an alkanesulfonyl chloride with ammonia or with an alkylamine in the presence of a chemically inert liquid diluent. The diluent is first supersaturated with ammonia or with the alkylamine before bringing it into contact with the alkanesulfonyl chloride.

Process of the production of alkanesulfonamides

Process of polymerization of unsaturated hydrocarbons, with an initial induction period, by means of a catalyst constituted by a halogeno-phenate of tungsten, of which the phenate group carries one or more substituents, in the presence of an organometallic co-catalyst; the halogeno-phenate is chosen from amongst those represented by the formula ##STR1## where X is a halogen, especially Cl or Br, n is a whole number 2, 3 or 4, R.sup.1 is H or a C.sub.1 to C.sub.8 straight- or branched-chain alkoxy group, R.sup.2 is H or a C.sub.3 to C.sub.9 branched-chain alkyl group, R.sup.1 and R.sup.2 never being hydrogen simultaneously.

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Arudy, France

Jean Ollivier