Weak Acid Cation Resin

Weak acid cation resin is used as a single resin for dealkalization in the H cycle and for brackish water softening in Na cycle. In demineralization, the use of a weak acid cation in front of a strong cation is preferred with feed waters containing a high proportion of temporary hardness (>40%) and low Free Mineral Acid (FMA). This configuration has advantages in terms of regeneration efficiency and operating capacity.

With sulfuric acid regeneration, two separate cation columns should be used in order to allow acid dilution at the weak acid resin inlet. For counter-flow regenerations, a double compartment layered bed cation including a facility for acid dilution at the weak acid cation inlet can be used, but is more complex to operate. DOWEX™ MAC-3 resin or DOWEX UPCORE™ MAC-3 resin are ideal for UPCORE system plants.

Product Description Type Matrix Total
Exchange
Capacity*
eq/l (kgr/ft3)		 Available
Forms
DOWEX MAC-3 A macroporous weak acid cation exchange resin used for water softening, dealkalization, and demineralization applications. Weak Acid Cation Polyacrylic, Macroporous 3.8 (83.0) H+


®™* Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow