Method for decalcification of an aqueous solution, in particular of lactoserum or of an utrafiltration permeate lactoserum
AssigneeApplexion
InventorMarc-Andrè Theoleyre
Life of this patent
Estimating the term…
Abstract
A method is provided for decalcification of an aqueous solution that has multivalent Ca2+ and Mg2+ cations and anions able to form complexes with at least a part of the multivalent cations. The method includes replacing at least part of the anions to form complexes of the aqueous solution by monovalent anions such as Cl−, non-able to form such complexes. The method also replaces at least a part of the multivalent cations of the aqueous solution by monovalent metal cations such as Na+ and/or K+. This later replacement step is performed simultaneously with or after the first replacement step.
Claims18
A decalcification method of an aqueous solution of whey or whey permeate comprising multivalent cations Ca2+ and Mg2+ and anions able to form complexes with at least a part of said multivalent cations, comprising the operations of:
- (a) replacement of at least a part of said anions able to form complexes of the aqueous solution by monovalent anions non-able to form such complexes, the replacement operation comprising processing of said aqueous solution by a strong anionic resin of which the counter-ion is a monovalent anion non-able to form complexes with said multivalent cations, (b) replacement of at least a part of said multivalent cations of the aqueous solution by monovalent metal cations by treatment of said aqueous solution by a strong cationic resin of which the counter-ion is a monovalent metal cation, wherein operation (b) is performed on the aqueous solution having undergone operation (a);
- and (c) regeneration of the anionic resin and/or the cationic resin by means of a regeneration agent comprising a dissolved salt of which the cation is of the same type as the monovalent metal cation forming the counter-ion of the cationic resin and/or of which the anion is of the same type as the monovalent anion forming the counter-ion of the anionic resin.
A method of decalcification of an aqueous solution of whey or whey permeate comprising multivalent cations Ca2+ and Mg2+ and anions selected from the group consisting of phosphates or anions from organic acids able to form complexes with Ca2+ and Mg2+ ions, the method consisting of first, replacing at least a part of said anions able to form complexes of the aqueous solution with monovalent anions not able to form such complexes, the first replacing step comprising processing of said aqueous solution by a strong anionic resin of which the counter-ion is a monovalent anion not able to form complexes with said multivalent cations, and second, replacing at least a part of said multivalent cations of the aqueous solution with monovalent metal cations by treatment of said aqueous solution by a strong cationic resin of which the counter-ion is a monovalent metal cation, wherein the second replacing step is performed on the aqueous solution having undergone the first replacing step.
A method of decalcification of an aqueous solution of whey or whey permeate comprising multivalent cations Ca2+ and Mg2+ and anions able to form complexes with at least a part of said multivalent cations, the method consisting of first, replacing at least a part of said anions able to form complexes of the aqueous solution with monovalent anions not able to form such complexes, the first replacing step comprising processing of said aqueous solution by a strong anionic resin of which the counter-ion is a monovalent anion not able to form complexes with said multivalent cations, and second, replacing at least a part of said multivalent cations of the aqueous solution with monovalent metal cations by treatment of said aqueous solution by a strong cationic resin of which the counter-ion is a monovalent metal cation, wherein the second replacing step is performed on the aqueous solution having undergone the first replacing step, and a further step comprising regenerating the anionic resin and/or the cationic resin by means of a regeneration agent comprising an aqueous solution comprising a dissolved salt of which the cation is of the same type as the monovalent metal cation forming the counter-ion of the cationic resin and/or of which the anion is of the same type as the monovalent anion forming the counter-ion of the anionic resin.
Dependencies are inferred from the claim text.