Method for preparing particles of alkali metal bicarbonate
AssigneeSolvay SA
InventorDavid Jean Lucien Savary
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Abstract
A method for preparing particles of alkali metal bicarbonate by crystallization from a solution of alkali metal carbonate and/or bicarbonate in the presence of an additive in the solution, selected from the sulfates, sulfonates, the polysulfonates, the amines, the hydroxysultaines, the polycarboxylates, the polysaccharides, the polyethers and the ether-phenols, alkali metal hexametaphosphate, the phosphates, the sulfosuccinates, the amidosulfonates, the aminosulfonates, preferably selected from the polycarboxylates having a mean molecular weight lower than 8000 g/mol, and such that the additive is present in the solution at a concentration of at least 1 ppm and preferably of at most 200 ppm.
Claims18
A method for preparing, by crystallization, alkali metal bicarbonate particles starting from a solution of alkali metal carbonate and/or bicarbonate in the presence of an additive in the solution, wherein the additive is a polycarboxylate selected from the group consisting of:
- polyacrylates, crosslinked polyacrylates, copolymers of acrylic and maleic acids, copolymers of sodium prop-2-enoate, and alkali metal salts thereof;
- wherein the additive is present in the solution at a concentration of at least 1 ppm;
- and wherein the additive has an average molecular weight below 8000 g/mol.
Dependencies are inferred from the claim text.