Snf Group

Benoît Legras

Cédrick Favero

Johann Kieffer

Raphaël Doudin

Jing Ling

Nicolas Boisse

Renaud Souzy

The invention relates to a novel sulfobetaine monomer and to a process for the preparation thereof, advantageously by reaction between a vinyl-amine compound and a vinyl-sulfonic acid compound, preferably in the presence of a solubilizing agent. The invention also relates to the (co)polymers obtained from this novel type of sulfobetaine monomer, and to the use thereof, for example as a flocculant, dispersing agent, thickening agent, absorbent agent or friction-reducing agent.

Sulfobetaine monomers, process for preparing same, and uses thereof

A continuous process for filtering a suspension of 2-acrylamido-2-methylpropane sulfonic acid crystals by means of a rotary pressure filter equipped with a drum, a surface of which is provided with cells covered with a filter medium, the drum rotating within a fixed concentric cylinder comprising at least three zones sealed from each other, respectively a filtration zone, a washing zone and a discharge zone, each zone opening onto the cells.

Process for filtering 2-acrylamido-2-methylpropane sulfonic acid

The invention relates to a method for the purification of acrylamido-2-methyl-2-propanesulphonic acid comprising the following successive steps: The invention also relates to a polymer obtained from acrylamido-2-methyl-2-propanesulphonic acid crystals or its salts, obtained according to such a method, and to the use of said polymer in oil and gas recovery, in water treatment, in sludge treatment, in manufacturing paper, in construction, in mining, in cosmetic formulation, in detergent formulation, in textile making, or in agriculture.

Method for the purification of acrylamido-2-methyl-2-propanesulphonic acid

The present invention relates to a water-soluble polymer obtained by polymerization of at least a 2-dimethylaminoethyl acrylate monomer and/or its salts, in presence of at least a tocopherol and/or its derivatives, or a tocotrienol and/or its derivatives, and its uses.

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Andrezieux Boutheon, France

Benoît Legras