Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

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Compagnie Generale Des Matieres Nucleaires

Areva Nc

Sylvain Faure

Paul Fuentes

Bernard Sillion

Bruno Fournel

R&eacute;gis Mercier

Michel Pineri

Yvan Lallot

Pierre Aldebert

Bruno Imbert

Stéphane Cadra

Alexia Balland-Longeau

Frédéric Cuer

Jean-Felix Salas

Marc Messalier

Francois Garonne

Denis Guettier

Sylvain Guignot

Jean-Félix Salas

Fabienne Gas

Esther Le Toquin

Philippe Patry

François Garonne

A method for producing an aqueous foam comprising (a) preparing a solution comprising at least one surfactant and at least one protic polar solvent, (b) bringing the solution into contact with a pressurised gas to obtain a two-phase mixture, and (c) injecting the two-phase mixture to obtain the aqueous foam after expansion or dispersion of the gas. The solution further comprises at least one gelling compound chosen from a non-nitrogenous polysaccharide and gelatin. An aqueous foam obtained by such method and uses of the same, in particular in the fields of decontamination, the purification of effluents, or the defusing or containment of explosive devices or suspected explosive devices.

Method for producing an aqueous foam

The present invention relates to a foam consisting of a dispersion of gas bubbles in a foaming solution comprising, per litre of solution, (i) from 0.05 to 1.5% by weight of one or more foaming organic surfactant(s), (ii) from 0.05% to 0.8% by weight of one or more organic gelling or viscosifying agent(s), (iii) from 1% to 14% by volume of one or more disinfecting agent(s) and (iv) water, said foam having an expansion between 12.5 and 50. The present invention also relates to the use of such a foam for biological decontamination.

Disinfecting aqueous foam, process for preparing same and use thereof

The present invention relates to a process for treating an earth contaminated by at least one radionuclide such as cesiumCs comprising at least one step of separating said radionuclide by dispersed air flotation foam produced by blowing air bubbles in a suspension comprising said earth and at least one collector. The present invention also relates to the flotation foam obtained by implementing such a process.

Method for the radioactive decontamination of soil by dispersed air flotation foam and said foam

A biological decontamination gel, consisting of a colloidal solution comprising from 5 to 30% by mass, preferably 5 to 25% by mass, still preferably 8 to 20% by mass, based on the mass of the gel, of at least one inorganic viscosifying agent: 0.5 to 10 mol/L of gel, preferably 1 to 10 mol/L of gel, of at least one active biological decontamination agent; 0.05 to 5% by mass, preferably 0.05 to 2% by mass, based on the mass of the gel, of at least one super-absorbent polymer; 0.1 to 2% by mass, based on the mass of the gel, of at least one surfactant; and the remainder of solvent. A biological decontamination method applying this gel.

Biological decontamination gel and method for decontaminating surfaces by using this gel

A stabilized foam formed from a foaming aqueous solution comprising from 0.1 to 7 mol of one or more decontamination, stripping and/or degreasing reactants per liter of solution and from 0.01 to 15% by weight of a solid stabilizing agent of solid particles type, with respect to the total weight of the solution, and a process for the preparation of said stabilized foam, to its use in decontaminating, stripping and/or degreasing a surface and to a process for decontaminating, stripping and/or degreasing a surface.

Decontamination, stripping and/or degreasing foam containing solid particles

The present invention relates to a vacuumable gel and the gel use to decontaminate surfaces, for example, radioactive decontamination. The gel is composed of a colloidal solution comprising:

Vacuumable gel for decontaminating surfaces and use thereof

The present invention related to a method for treating a surface with a gel, as well as to a treatment gel. The treatment may be a decontamination, etching or surface degreasing treatment, for example. The method comprises in this order, the following steps: applying the treatment gel on the surface to be treated, maintaining the treatment gel on the surface to be treated at a temperature and relative humidity such that the gel dries by breaking up and that it has the time to treat the surface before forming a dry and solid residue, and removing the dry and solid residue from the treated surface by suction or brushing. The gel comprises a viscosing agent, a treatment agent and optional an oxidizing agent.

Method for treating a surface with a treatment gel, and treatment gel

The present invention relates to a method for treating a surface with a gel, as well as to a treatment gel. The treatment may be a decontamination, etching or surface degreasing treatment, for example. The method comprises in this order, the following steps: applying the treatment gel on the surface to be treated, maintaining the treatment gel on the surface to be treated at a temperature and relative humidity such that the gel dries by breaking up and that it has the time to treat the surface before forming a dry and solid residue, and removing the dry and solid residue from the treated surface by suction or brushing. The gel comprises a viscosing agent, a treatment agent and optionally an oxidizing agent.

Method for treating a surface with a treatment gel and treatment gel

The invention relates to a composition which makes it possible to obtain a gelled aqueous foam capable of decontaminating, stripping or degreasing a surface. The composition of the present invention comprises one or more surfactants, one or more acidic or basic reactants and a gelling agent. The decontamination foam obtained from this composition exhibits long lifetimes, generally of between 1 and 10 hours, guaranteeing a prolonged time of action on the surface and a high decontamination effectiveness. These foams can be used to remove the radioactivity from an inaccessible plant, which is large in size and complex in design, by simple filling or by simple spraying over an accessible surface.

Composition, foam and process for the decontamination of surfaces

Sulphonated polyimides, membranes prepared with them, and a fuel cell device that includes these membranes

The invention relates to sulphonated polyimides, notably of formula (I)

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Venasque, France

Sylvain Faure