Method for preparing alkali metal bicarbonate particles
AssigneeSolvay SA
InventorDavid Jean Lucien SAVARY
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Abstract
A method for preparing alkali metal bicarbonate particles by crystallization from an alkali metal carbonate and/or bicarbonate solution with an additive present in the solution, chosen from among sulfates, sulfonates, polysulfonates, amines, hydroysultaines, polycarboxylates, polysaccharides, polyethers and ether-phenols, alkali metal hexametaphosphate, phosphates, sulfosuccinates, amidosulfonates, amine sulfonates, preferably chosen from among polysaccharides, and such that the additive is present in the solution at a concentration of at least 1 ppm and preferably at most 200 ppm.
Claims22
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 selected from group consisting of:
- sulfates, in particular sodium sulfate and organosulfates;
- sulfonates;
- polysulfonates;
- amines, in particular primary amines, cyclic amines, quaternary amines comprising at least one carboxylic acid group;
- hydroxysultaines;
- polycarboxylates;
- polyethers and ether-phenols;
- sulfosuccinates;
- amidosulfonates;
- aminosulfonates;
- alkali metal hexametaphosphate in particular of sodium or potassium;
- and
- phosphates, in particular organophosphates, and phosphonates;
- and the additive is present in the solution at a concentration of at least 1 ppm.
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 polysaccharide;
- and
- wherein the additive is present in the solution at a concentration of at least 1 ppm.
Dependencies are inferred from the claim text.