Process for preparing sodium bicarbonate particles
AssigneeSolvay SA
InventorsThoi-Dai Chau, David Jean Lucien Savary
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Abstract
A process for preparing sodium bicarbonate particles, comprising the steps of: (a) adding at least one alkali metal carbonate to an aqueous solution in order to form an aqueous composition; wherein the alkali metal carbonate comprises sodium carbonate and wherein the aqueous composition comprises at least one polycarboxylic acid and/or the salts thereof, in an amount of at least 200 ppm based on the weight of the aqueous composition; and (b) precipitating solid particles comprising sodium bicarbonate crystals and separating said sodium bicarbonate particles from the aqueous composition, in order to obtain sodium bicarbonate particles and an aqueous mother liquor.
Claims20
A process for preparing sodium bicarbonate particles, the process comprising the steps of:
- (a) adding at least one alkali metal carbonate to an aqueous solution in order to form an aqueous composition;
- wherein the alkali metal carbonate comprises sodium carbonate and wherein the aqueous composition comprises at least one polycarboxylic acid and/or salts thereof, in an amount of at least 200 ppm based on the weight of the aqueous composition;
- and
- (b) precipitating solid particles comprising crystals of sodium bicarbonate in said aqueous composition of step (a) and separating said sodium bicarbonate particles from the aqueous composition, in order to obtain sodium bicarbonate particles and an aqueous mother liquor.
Sodium bicarbonate particles, having an average equivalent spherical diameter D50 of at least 10 μm, a D90 of at least 60 μm, as measured by laser light scattering, and an average BET specific surface area of at least 4.0 m2/g.
Sodium carbonate particles, having an average equivalent spherical diameter D50 of at least 10 μm, a D90 of at least 60 μm, as measured by laser light scattering, and an average BET specific surface area of at least 10 m2/g.
Dependencies are inferred from the claim text.