Kinetics of Ag+ contained polymeric complex membranes for facilitated olefin transport

The reactions of silver ion complexes with polyethylene-graft-poly (acrylic acid) (PE-g-AA) and the olefin reversible coordinates with the PE-g-AA-Ag+ complex membranes were studied. Infrared and nuclear magnetic resonance spectra confirmed the complex formation between the carboxylic acid of the PE-g-AA and the Ag+ ion. Also, the Ag+ ion in PE-g-AA-Ag+ membrane was assumed to be a fixed carrier that adsorbs and transports olefin, thereby causing a selective olefin/paraffin separation. A theoretical model of the PE-g-AA-Ag+ ( olefin) complex was proposed. The coordination number of Ag+ ion binding to the carboxylic acid of PE-g-AA is about 1.6 in glycerol solution. The coordination number of olefin binding to the Ag+ in the PE-g-AA-Ag+ complex membrane is 1. Moreover, the kinetics of olefin binding to the PE-g-AA-Ag+ complex membranes were studied. The equilibrium, association, and dissociation constants were also presented. (C) 1997 John Wiley & Sons, Inc.