Method for preparing alkali metal bicarbonate particles
AssigneeSolvay SA
InventorDavid Jean Lucien SAVARY
Life of this patent
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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.
Claims18
A method for preparing alkali metal bicarbonate particles, comprising crystallization of 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:
- alkyl ether sulfates;
- isopropylamine dodecylbenzene sulfonate;
- polyethers or ether-phenols selected from the group consisting of:
- polyethylene glycol mono(tristyrylphenyl) ether;
- ethoxylated oleyl alcohols;
- branched octylphenoxy poly(ethyleneoxy)ethanols;
- ethoxylated polyarylphenols;
- sulfosuccinates;
- aminosulfonates selected from the group consisting of N-methyltaurine, sodium N-methyltaurinate, and isopropylamine dodecylbenzene sulfonate;
- organophosphates or phosphonates selected from the group consisting of:
- polyoxyethylene alkylether phosphates, whose alkyl chain advantageously comprises from 6 to 20 carbons;
- poly(oxy-1,2-ethanediyl),.alpha.-(dinonylphenyl)-omega-hydroxy-phosphate;
- alkyl-phosphonic or hydroxyalkyl-phosphonic acids of semi-structural formula ((HO)2OP)—R with R being an alkyl group or hydroxyalkyl group, or salts thereof;
- alkyl-diphosphonic acids of semi-structural formula ((HO)2OP)—R—(PO(OH)2) with R being an alkyl group or a hydroxyalkyl group, or salts thereof;
- nitrilo-alkyl-phosphonic acids of semi-structural formula ((HO)2OP—R)3—N with R being an alkyl chain with 1 to 5 carbons, or salts thereof;
- and wherein the additive is present in the solution at a concentration of at least 1 ppm.
Dependencies are inferred from the claim text.