Back to results
US 10,576,467 B2Granted
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
Estimating the term…
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.
Claims12
An apparatus for recovering one or more diamines from aqueous solutions comprising one or more of the below zones:
- (a) an adsorption zone comprising an ion exchange resin, for adsorption of the one or more diamines as a divalent species;
- (b) a monovalent strip zone, for desorbing impurities and converting the adsorbed one or more diamines to the monovalent state;
- (c) a monovalent adsorption zone, for adsorbing recycled diamines recycled from a steam stripper;
- and
- (d) an elution zone, for eluting the one or more diamines using a concentrated ammonia, ammonium bicarbonate or ammonium carbonate solution.
2 more elements
Dependencies are inferred from the claim text.