Novacarb

Rhone-poulenc Chimie

Fabrice Fourcot

Jean-Claude Pouxviel

Jean-Yves Chane-Ching

Christophe Zing

A composition having sodium bicarbonate, sodium carbonate, and ammonia in the form of ammonium salts is formed by heat treating ammoniacal bicarbonate at a temperature between 20 and 150&deg; C. A method of using the composition includes reacting the composition with a flue gas containing HX acids, where X represents halogens, compounds of the SO,type, or mixtures thereof, or the flue gases may contain NO,compounds.

Composition containing at least sodium bicarbonate, preparation method therefor and uses thereof

A method for removing contaminants, such as sulfur dioxide, mercury and hydrochloric acid, out of flue gases is provided, said method including the steps of: treating the flue gases with a reagent, such as sodium carbonate, sodium bicarbonate and ammonium salts or mixtures thereof; selectively dissolving the sodium phosphates produced thereby in water; separating out the solids remaining in suspension in the solution; and crystallizing the purified sodium sulphate present in the above-mentioned solution. The sodium sulfate can be upgraded in glass working furnaces. The reagent can be obtained by heating an intermediate solution containing sodium bicarbonate; sodium carbonate; ammonium bicarbonate and ammonium carbonate, which was obtained from the Solvay process for manufacturing sodium carbonate.

Method for processing flue gases containing sulphur oxides

The invention relates to the use of barium sulphide or strontium sulphide for the removal of heavy metals in industrial acidic solutions. The invention is applicable to the purification of contaminated acids, in particular of spent battery acid, or of industrial solutions of titanyl sulphate.

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Velizy, France

Fabrice Fourcot