Sodium bicarbonate particles manufactured by atomization
AssigneeSolvay SA
InventorDavid Jean Lucien Savary
Life of this patent
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Abstract
Method for producing sodium bicarbonate particles by spray-drying of an aqueous solution comprising 1 to 10% by weight of sodium bicarbonate and an additive selected from the group consisting of: magnesium salt, sodium alkylbenzene sulfonate and soybean lecithin. Sodium bicarbonate particles obtainable by such process and comprising at least 20 mg of the additive per kg of sodium bicarbonate particles.
Claims22
A method for producing sodium bicarbonate particles comprising:
- spray-drying of an aqueous solution comprising 1 to 10% by weight of sodium bicarbonate and an additive selected from the group consisting of:
- a magnesium salt, sodium alkylbenzene sulfonate and soybean lecithin, to form sodium bicarbonate particles, wherein said formed sodium bicarbonate particles have a lower mean particle size D50 by weight compared to sodium bicarbonate particles obtained without the additive and at least 50% of the formed sodium bicarbonate particles have spherical shape, wherein said spray-drying is carried out in a gas comprising at least 5% of CO2 by volume on a dry gas basis and in a spray-drying chamber, and wherein the gas is preheated before being introduced into the spray-drying chamber at a temperature of at least 40° C. and at most 220° C.
Sodium bicarbonate particles, comprising at least 20 mg and at most 50,000 mg of an additive per kg of sodium bicarbonate particles and having a BET specific surface area of at least 6 m2/g, wherein the additive is a compound of magnesium Mg2+, wherein said sodium bicarbonate particles have a lower mean particle size D50 by weight compared to sodium bicarbonate particles obtained without the additive and at least 50% of the formed sodium bicarbonate particles have spherical shape and wherein the sodium bicarbonate particles have a bulk density of from 40 to 80 kg/m3.
Dependencies are inferred from the claim text.