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US 2018/0207631 A1Published application
Materials and methods for the selective recovery of multivalent products
AssigneeInvista North America S.A.R.L.
InventorsMariusz Kamionka, Alex Conradie
Life of this patent
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Abstract
Described herein are processes and apparatus for the high purity and high concentration recovery of multivalent products via continuous ion exchange from aqueous solutions for further down-stream purification.
Claims13
1-12. (canceled)
An apparatus for recovering multivalent products from aqueous solutions comprising one or more of the below zones;
- (a) an adsorption zone comprising an ion exchange resin, for adsorption of the the multivalent product comprising diamine chosen from putrescine, cadaverine, hexamethylenediamine, and heptamethylenediamine as principally a divalent species;
- (b) a monovalent strip zone, for desorbing impurities and converting the adsorbed multivalent product to the monovalent state;
- (c) a monovalent adsorption zone, for adsorbing recycled multivalent product recycled from a steam stripper;
- and
- (d) an elution zone, for eluting the multivalent product using a concentrated ammonia, ammonium bicarbonate or ammonium carbonate solution.
2 more elements
14-16. (canceled)
Dependencies are inferred from the claim text.