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《DOWEXamp;#8482;MARATHONamp;#8482;11IonExchangeResinEngineeringInformation》.pdf
Dow
Liquid Separations
DOWEX™ MARATHON™ 11
Ion Exchange Resin
Engineering Information
March 2006
DOWEX™ MARATHON™ 11 Type I Strong Base Anion Exchange Resin
General Information
DOWEX™ MARATHON™ 11 resin is a high capacity, high porosity, strong base type I anion exchange resin of uniform
bead size distribution. Based on a styrene-divinylbenzene copolymer matrix, this gel type resin has proven to be an excellent
choice for use in the anion exchange unit of multi-bed demineralizer trains, in mixed beds, or as an organic trap. It is
especially recommended for treating waters that contain naturally occuring organic matter. Its unique porosity and high
thermal stability provide for more complete removal of organics over long periods of service, resulting in consistently high
quality water.
In addition to its organic removal properties, the uniform particle size offers a number of advantages compared to
conventional (polydispersed) resins. The absence of large diameter beads and the high surface area to volume ratio enable
rapid exchange kinetics during operation. This results in more complete regeneration of the resin, increased capacity and
faster, more thorough rinse following regeneration.
Installed in front of the cation exchange unit, chloride form DOWEX MARATHON 11 resin acts as an organic screen,
removing organic molecules that would foul the working strong base anion resin. This results in dramatic increases in
demineralization efficiency.
The excellent thermal stability of DOWEX MARATHON 11 resin (up to 100°C (212°F) in the Cl- form), is superior to acrylic
type resins which start to degrade at temperatures above 35°C (95°F), giving rise to capacity loss and long rinses. DOWEX
MARATHON 11 resin is therefore better able to withstand high temperature brine cleaning and the use of heated caustic,
resulting in better, long term performance for operating capacity and silica leakage.
This brochure gives operational data on the use of DOWEX MA
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