Hyperbranched chelating polymers for the polymer-assisted ultrafiltration of boric acid

Journal Article · Thu Jul 01 00:00:00 EDT 1999 · Separation Science and Technology

DOI:https://doi.org/10.1081/SS-100100747· OSTI ID:682255

Smith, B M; Todd, P; Bowman, C N ^[1]

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1. Univ. of Colorado, Boulder, CO (United States). Dept. of Chemical Engineering

Two hyperbranched chelating polymers, glucoheptonamide derivatives of dendrimetric poly(amido amine) and poly(ethylene imine), were employed in polymer-assisted ultrafiltration and concentration of boron from aqueous feed streams. For feeds containing approximately 1 mM B (10 ppm), volume reduction factors of 20 were observed in cyclic adsorption-desorption. The concentrations of both polymers declined due to permeation through an ultrafiltration membrane with pore sizes which should have retained them. Acid-catalyzed hydrolysis of the amide linkages between the polymer backbone and the chelating side groups is implicated in this loss of polymer mass and effectiveness.

• OSTI ID: 682255
• Journal Information: Separation Science and Technology, Vol. 34, Issue 10; Other Information: PBD: Jul 1999
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BORON
BORIC ACID
ULTRAFILTRATION
CHELATING AGENTS
POLYMERS
SURFACE WATERS
REMEDIAL ACTION