Process for preparing ultra-fine sodium bicarbonate powder

C - Chemistry – Metallurgy – 01 – D

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Details

C01D 7/18 (2006.01) B01D 9/02 (2006.01) B01D 37/00 (2006.01) B01J 2/02 (2006.01) C01D 7/38 (2006.01)

Patent

CA 2681009

Ultra-fine sodium bicarbonate powder (mean particle size less than 5 microns) is produced by the mixing and reaction under agitation at control temperatures of solutions of ammonium bicarbonate and sodium chloride. Precipitated sodium bicarbonate is separated by filtration as a slurry which is dried to produce ultra-fine sodium bicarbonate. Ultra-fine sodium bicarbonate produced by this method also exhibits a narrow particle size distribution which is advantageous in blowing agents for thermoplastic resins, to produce a foamed resin with small cells of a narrow size distribution.

La poudre ultrafine de bicarbonate de soude selon l'invention, de granulométrie moyenne inférieure à 5 microns, est produite en mélangeant et en faisant réagir sous agitation, avec un contrôle des températures, des solutions de bicarbonate d'ammonium et de chlorure de sodium. Le bicarbonate de soude précipité est séparé par filtration sous la forme d'une bouillie, ladite bouillie étant ensuite séchée pour produire le bicarbonate de soude ultrafin. Le bicarbonate de soude ultrafin ainsi produit présente également une distribution granulométrique étroite, ce qui est un avantage pour l'utiliser dans des agents de soufflage pour des résines thermoplastiques, de manière à produire une résine expansée comportant de petites cellules dont les tailles répondent à une distribution étroite.

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