AMINE REMOVAL FROM WASTE WATER BY LIGAND EXCHANGE

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Abstract
Ligand exchange is a process in which a substance is removed from solution by complexing with a metal ion held on an ion exchange resin. This paper presents basic data on separation of ethanolamine and butyl amine from dilute aqueous solution by complexing with copper(II) ion held on a carboxylic acid type resin. Experimental equilibrium curves and ligand exchange breakthrough curves are presented for the two amines. The equilibrium curves are satisfactorily represented by an empirical Langmuir isotherm. The breakthrough curves are successfully modelled by the Thomas mathematical formulation using a mass transfer controlled rate mechanism. The ligand exchange process may be useful commercially for removal of amines from aqueous waste streams.