Arkema France

Elf Atochem S.a.

Other

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Philippe Maj

Bruno Van Hemelryck

Jean-Pierre Schirmann

Andre Lantz

Eric Lacroix

Dominique Guillet

Guillaume Le

Francois Fajula

Dominique Garrait

Fabrice Domingues Dos Santos

Sylvain Perdrieux

Wolfgang Holderich

Thierry Lannuzel

Reinhard Linemann

Christian Laurichesse

Markus Brandhorst

Georges Martino-Gauchi

Pierre Ravenel

François Fajula

Philippe Leduc

Emmanuel Guiraud

Pascal Nicol

Albert Blum

Wilm Eickelberg

Anne Berson

Francesco DiRenzo

Francesco Di Renzo

The present invention relates to a method for purifying a mixture containing at least one alkyl hydroperoxide, preferably tert-butyl hydroperoxide or tert-amyl hydroperoxide, and at least one corresponding dialkyl hydroperoxide, said method comprising at least one step of extraction with water and at least one separation step which is carried out within the aqueous phase, obtained following the extraction step, in order to recover an aqueous solution which is rich in alkyl hydroperoxide. The invention also relates to an aqueous composition which is rich in alkyl hydroperoxide and contains at least 0.1% by weight of dialkyl peroxide in relation to the total weight of the composition.

Method for purifying alkyl hydroperoxide by extraction with water and separation of the aqueous phase

The invention relates to a method for purifying an alkyl hydroperoxide from dialkyl peroxide thereof, comprising a step of distillation in the presence of alcohol and water followed by extraction of the condensates using a hydrocarbon or a hydrocarbon blend.

Purification of alkyl hydroperoxide by extractive distillation

The present invention relates to a process for the concentration of a water-soluble organic peroxide, preferably an alkyl hydroperoxide, by reverse osmosis as well as to a process for the separation of a water-soluble organic peroxide and of a water-insoluble compound.

Method for concentrating a water-soluble organic peroxide

The present invention concerns a method and an apparatus () for a continuous preparation of organic peroxides, with the reactor comprising at least one flow channel () configured as a reaction zone; an inlet system () in fluid communication with a first end of the at least one flow channel and configured for introducing two or more substances or a combination of substances into the at least one flow channel; an outlet system () in fluid communication with a second end of the at least one flow channel, the second end being located downstream of the first end and the outlet system being configured for extracting a reaction product present at the second end; an oscillatory system () configured for superimposing an oscillatory flow on the flow of substances passing through the at least one flow channel, the oscillatory being effected in at least a section of the at least one flow channel; and a controller configured to implement the method by controlling the inlet system to introduce, according to a first time characteristic, at least two substances or a combination of substances into the at least one flow channel, the oscillatory system to superimpose an oscillatory flow on at least a part of the flow of substances passing through the at least one flow channel, and the outlet system to extract, on an ongoing basis, the reaction product formed in the flow channel from the substances introduced such that the output mass flow rate corresponding to the sum of the input mass flow rates.

Synthesis of organic peroxydes using an oscillatory flow mixing reactor

The invention relates to a process for manufacturing polyethylene or an ethylene copolymer, comprising a step of radical polymerization or copolymerization of ethylene in the presence: 

Radical polymerisation of ethylene initiated by a couple of organic peroxides with high productivity

A method for preparing peroxide, including a step of treating, in a reaction medium, a component having at least one tertiary alcohol grouping with a compound having at least one tertiary hydroperoxide function in the presence of a catalyst, said method being characterized in that the catalyst includes a sulphonic acid and a inorganic acid, the molar ratio between the sulphonic acid and the aforementioned component including at least one tertiary alcohol grouping ranges from 0.05 to 0.8, and the molar ratio between the inorganic acid and the aforementioned component including at least one tertiary alcohol grouping ranges from 0.05 to 0.8. Also, to the peroxide resulting directly from said preparation method.

Method for preparing organic peroxides

The present invention relates to the preparation of trifluoroethylene (VFor TrFE) by hydrogenolyzis of chlorotrifluoroethylene (CTFE) in the gaseous phase over a group VIII metal catalyst deposited on a support. This method can be used to obtain VFin an economical manner in conditions which minimize the risk of explosion of this molecule. Using a catalyst containing a group VIII metal and, more specifically, containing Pd deposited on a support and a specific series of steps of separation and purification makes it possible to obtain excellent CTFE conversion rates and high selectivity in VFat atmospheric pressure and at low temperatures.

Method for synthesising trifluoroethylene from chlorotrifluoroethylene

A method for manufacturing polyethylene or an ethylene copolymer, including a step of free radical polymerization or copolymerization of the ethylene at an initiation temperature varying from 150&#xb0; C. to 200&#xb0; C., at a pressure varying from 500 to 3000 bar, in the presence of a peroxidic polymerization initiator selected from among the peroxide compounds of formula (I) in which R1 and R8 are, separately, a C2-C6 alkyl group; R2, R3, R6 and R7 are, separately, a C1-C5 alkyl group; and R4 and R5 are, separately, a C1-C6 alkyl group.

Free radical polymerisation of ethylene initiated by organic peroxides with high productivity

The present application relates to a method for manufacturing tert-butyl hydroperoxide that includes the following steps: a) fermenting renewable raw materials and optionally purifying the same to produce a mixture containing at least butanol; b) dehydrating the butanol into butane; c) converting the butane into isobutene and optionally hydrating the isobutene to produce tert-butanol; d) reacting the product of step c) with hydrogen peroxide so as to produce tert-butyl hydroperoxide; and e) isolating the tert-butyl hydroperoxide. The invention also relates to tert-butyl hydroperoxide containing carbon atoms from renewable resources, to the compositions containing said tert-butyl hydroperoxide, and also relates to the use thereof as a polymerization initiator.

Manufacture of tertiobutyl hydroperoxyde from renewable materials, tertiobutyl hydroperoxide thus obtained, and uses thereof

The present invention relates to the method for obtaining vinylidene fluoride and the subject matter thereof is more particularly the production of vinylidene fluoride by pyrolysis of 1,2-dichloro-2,2-difluoroethane in the presence of hydrogen at a temperature of greater than or equal to 400&#xb0; C.

Method for preparing vinylidene fluoride

The present invention relates to a process for the preparation of lauryllactam in which a Beckmann rearrangement of cyclododecanone oxime is carried out. Said process is carried out in the gas phase at a temperature of between 180 and 450&#xb0; C. in the presence of a microporous material having a three-dimensional inorganic main structure composed of tetrahedra connected via a common edge, called zeolite.

Process for the synthesis of lauryllactam (L12) by gas phase catalytic rearrangement of cyclododecanone oxime

The present invention relates to a process for the preparation of dimethylketene (DMK) and then of polydimethylketene (PDMK) by polymerization of DMK. More specifically, the DMK is obtained by pyrolysis by isobutyric anhydride (IBAN), the latter decomposing under the effect of heat (pyrolysis) to give isobutyric acid (IBA) and DMK. One mole of pyrolyzed IBAN gives one mole of IBA and one mole of DMK.

Method of preparing dimethylcetene and, subsequently, polydimethylcetene from isobutyric anhydride

Isomerization of hydrofluorocarbon

In order to purify a crude pentafluoroethane (F125) containing chloropentafluoroethane (F115), it is subjected to a heat treatment in the presence of hydrogen, the treatment being carried out at a temperature at least equal to 550.degree. C. and with an H.sub.2 /F115 molar ratio of at least 10.

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Villeurbanne, France

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