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 selected from the following compounds:
- 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;
- polysaccharides;
- polyethers and ether-phenols;
- sulfosuccinates;
- amidosulfonates;
- aminosulfonates;
- alkali metal hexametaphosphate in particular of sodium or potassium;
- 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 polycarboxylate;
- and
- wherein the additive is present in the solution at a concentration of at least 1 ppm.
Dependencies are inferred from the claim text.