Rhodia Operations

Eric Perin

Laurent Guy

Cédric Boivin

Kilani Lamiri

Cedric Boivin

Dominique Dupuis

Sylvaine Neveu

Anne-Laure Pinault

Cèdric Boivin

Robert Eberhardt

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, optionally in the presence of an aluminium compound; wherein at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation. It also relates to a novel precipitated silica and to its uses.

Process for the preparation of precipitated silicas, precipitated silicas and their uses, in particular for the reinforcement of polymers

The invention relates to a novel process for preparing a precipitated silica, in which: a silicate is reacted with an acidifying agent, so as to obtain a suspension of precipitated silica, said suspension of precipitated silica is filtered, so as to obtain a filter cake, said filter cake is subjected to a liquefaction operation comprising the addition of an aluminum compound, after the liquefaction operation, a drying step is performed, characterized in that at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation. The invention also relates to novel precipitated silicas and to uses thereof.

Method of preparing precipitated silicas, novel precipitated silicas, and their uses, in particular for reinforcing polymers

The invention relates to a process for the preparation of a novel precipitated silica, wherein: a silicate is reacted with an acidifying agent, so as to obtain a silica suspension; said silica suspension is filtered, so as to obtain a filter cake; said filter cake is subjected to a liquefaction operation, in the absence of an aluminium compound; wherein a mixture of polycarboxylic acids is added to the filter cake, during or after the liquefaction operation. It also relates to novel precipitated silicas and to their uses.

The invention relates to a process for preparing a precipitated silica, to precipitated silicas, and to uses thereof. The process of the invention generally includes reacting a silicate with an acidifying agent, so as to obtain a suspension of precipitated silica; filtering the precipitated silica to obtain a filter cake; subjecting the filter cake to a liquefaction operation to form a second filter cake; and drying the second filter cake. In the process of the invention, at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation

Method for preparing precipitated silicas, novel precipitated silicas, and uses thereof, particularly for polymer reinforcement

The invention relates to a process for preparing a precipitated silica, to precipitated silicas, and to uses thereof. The process of the invention generally includes reacting a silicate with an acidifying agent, so as to obtain a suspension of precipitated silica; filtering the precipitated silica to obtain a filter cake; subjecting the filter cake to a liquefaction operation to form a second filter cake; and drying the second filter cake. In the process of the invention, at least one polycarboxylic acid is added to the filter cake, during or after the liquefaction operation.

Method for preparing precipitated silicas, novel precipitated silicas and uses thereof, particularly for the reinforcement of polymers

The invention relates to a novel process for the preparation of a precipitated silica, in which: It also relates to novel precipitated silicas and to their uses.

Method for preparing precipitated silicas, novel precipitated silicas and their uses, in particular for strengthening polymers

A precipitated silica having a CTAB specific surface in the range of from 50 to 300 m/g; a BET/CTAB specific surface ratio equal to or greater than 1.3 and comprising at least one polycarboxylic acid.

The invention relates to a novel process for preparing a precipitated silica, in which: The invention also relates to novel precipitated silicas and to uses thereof.

Method for preparing precipitated silicas, novel precipitated silicas and the uses of same, in particular for reinforcing polymers

The present disclosure relates to a novel process for the preparation of a precipitated silica, in which: It also relates to novel precipitated silicas and to their uses.

Composite materials having high cohesive strength, formed from at least one polymer and from at least one compound selected from among mineral oxides, aluminosilicates and active carbon, are characterized by a mean particle size of at least 100 mm, a pore volume (Vd1) formed by pores having a diameter ranging from 3.6 to 1,000 nm, equal to at least 0.2 cm/g, a cohesive strength such that its content of particles having a size of less than 100 mm, obtained after being subjected to an air pressure of 2 bar, of less than 1.5%, preferably 0.0%, by volume; such composite materials are formed into useful liquid supports, catalyst supports, additives, or liquid or gas filters, in particular into cigarette filters.

High cohesive strength composite materials and, E.G., cigarette filters shaped therefrom

A method for preparing precipitated silicas is described. A precipitation reaction between a silicate and an acidifying agent is also described, wherein a precipitated silica suspension is produced, and, subsequently, separation and drying of the suspension is conducted, in which, inter alia, one of the following three operations (a, b or c) is performed: (a) simultaneously adding a compound of aluminium and a basic agent, (b) simultaneously adding a silicate and a compound of aluminium, (c) simultaneously adding the acidifying agent, a silicate and a compound of aluminium.

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Villefranche sur Saône, France

Eric Perin