METAL CHELATING RESINS BY CONDENSATION OF ETHYLENE DIAMINE WITH P-DICHLOROMETHYL BENZENE

Polycondensation of ethylene diamine with p-dichloromethyl benzene in different molar ratios (0.8-1.5) gives mostly crosslinked polymers. Th ese resinous polymers are water-compatible and have moderate swelling ability (swelling rate 1.6-20) in water depending on the pH of the sol utions. The free amine state of the resinous polymers are capable of c helating with various transition-metal ions such as Cu(II), NI(II), Co (II), Cd(II), and Zn(II), even in very low concentrations. Due to rapi d complexation, high metal binding capacity, and ease of regenerabilit y, these resins can be useful for the removal and recovery of transiti on-metal ions from water solutions. (C) 1996 John Wiley & Sons, Inc.