Weak base anion resin is used as a single resin to obtain partially deionized water without removal of CO2 and SiO2. For complete demineralization, the combination of weak base and strong base anion is an excellent choice for larger plants, as it provides optimum operation costs. The weak base has very high regeneration efficiency and provides additional capacity to the system. The weak and strong anion combination is well suited to treat waters with low alkalinity or degassed feed, when the Free Mineral Acid (FMA: Cl, NO3, SO4) is typically > 60% of the total anions. DOWEX™ MARATHON™ WBA resin is the resin of choice for general demineralization.
Weak base anions are particularly effective in handling natural organics, which are usually high molecular weight, weakly acidic compounds that affect both weak base and strong base anion resins. In a weak base - strong base anion configuration, some of the organics will pass through the weak to the strong base. The design should therefore account for SBA organic loading at the end of the cycle, as the resin will require additional NaOH to desorb the organics. There are important differences in loading capacity or reversibility to organics between different anion types. For more information on organic tolerance of resins, see the resin selection guide.
For treating resins contaminated with silica or organics, see silica removal (20KB PDF) and brine cleaning of anion resins for organic contamination (26KB PDF).
The weak and strong anion resins can either be designed in two separate vessels or for counter-flow regeneration in one vessel with or without a separation nozzle plate. For separated anions, DOWEX MARATHON WBA and DOWEX MARATHON A resins are recommeded. DOWEX MARATHON WBA and DOWEX MARATHON A LB resins are designed to be used together as a layered bed in a single column without a nozzle plate. For plants with UPCORE™ systems, the suggested resins are DOWEX UPCORE Mono WB-500 resin and DOWEX UPCORE Mono A-500 resin or DOWEX UPCORE Mono A-625 resin.
|DOWEX™ 66||Ion exchange resin for sweetener applications.||Styrene-DVB, Macroporous||1.60||FB (Free Base)|
|DOWEX MONOSPHERE™ 66||Ion exchange resin for sweetener applications, designed for improved performance.||Styrene-DVB, Macroporous||1.60||FB (Free Base)|
|DOWEX MONOSPHERE 77||Ion exchange resin for sweetener applications providing the highest performance.||Styrene-DVB, Macroporous||1.70||FB (Free Base)|
|DOWEX MARATHON™ WBA||A uniform particle size, high capacity, weak base anion exchange resin for water demineralization applications.||Styrene-DVB, Macroporous||1.30 (28.4)||FB (Free Base)|
|DOWEX MARATHON WBA-2||Uniform particle size, high capacity, weak base anion exchange resin for water demineralization applications.||Styrene-DVB, Macroporous||1.70 (37.1)||FB (Free Base)|
|DOWEX UPCORE™ Mono WB-500||A uniform particle size, weak base anion exchange resin specifically designed for the UPCORE system in either single bed or layered bed applications.||Styrene-DVB, Macroporous||1.30 (28.4)||FB (Free Base)|
|DOWEX M4195||Chelating resin for copper, nickel, and cobalt processing.||Styrene-DVB, Macroporous||Bis-Picolylamine|
|AMBERLITE™ FPA51||A weak base anionic exchange resin designed for the deashing and decalcification of liquid food streams, including starch-based sweeteners.||Crosslinked polystyrene||≥ 1.30||FB|
|AMBERLITE FPA53||An acrylic, weak base, gel-type anion exchange resin designed for deashing of liquid food streams.||Crosslinked acrylic gel structure||≥ 1.60||-|
|AMBERLITE FPA55||An acrylic, weak base, gel-type anion exchange resin designed for the deashing of liquid food streams including starch based specialty sweeteners.||Crosslinked acrylic gel structure||≥ 1.60||-|
|AMBERLITE IRA67||An industrial grade weak base anion exchanger resin based on an acrylic cross-linked copolymer.||Crosslinked acrylic gel structure||≥ 1.60||-|
|AMBERLITE IRA96||An industrial grade weak base anion exchanger.||Styrene divinylbenzene copolymer||≥ 1.25||-|
|AMBERLITE IRA96SB||An macroreticular weak base anion exchange resin.||Styrene divinylbenzene copolymer||≥ 1.25||-|
|AMBERLITE PWA7||An anion exchange resin designed for the removal of chromate from drinking water.||Cross linked polycondensate||≥ 1.6||-|
|AMBERLITE PWA8||An anion exchange resin designed for the removal of uranium from drinking water.||Crosslinked copolymer||≥ 1.9||-|
|AMBERLITE PWA10||A distinct potable water grade ion exchange resin designed for the removal of boron from potable water.||Macroporous polystyrene||≥ 0.70||-|
|AMBERLITE CR5550||Specially designed for use in purification of organic acids.||Crosslinked acrylic gel structure||≥ 1.6||FB|
|IMAC HP661||a weak base anion exchange resin that is used in food processing.||Polystyrene divinylbenzene copolymer||≥ 1.6||FB|
|XUS 43568.00||Anion exchange resin for acid removal from lubricants.||Styrene-DVB, Macroporous||1.7||FB|
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