| 摘要 |
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. |
| 主权项 |
1. 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. |
