Aldex Chelation Resin Series
CR 2012 Weak Acid Cation
Aldex CR 2012 is an extremely durable macroporous resin containing amino phosphonic group attached to polystyrene copolymer matrix. Aldex CR 2012 is used for selective removal of bivalent metal cations from a solution of primarily monovalent cations. For example, Aldex CR 2012 is used for the decalcification of brine solutions in the chloralkali industry.
Download Aldex CR 2012 Technical Bulletin
Physical Chemical Properties
| Polymer Structure: | Macroporous, Styrene Divinylbenzene |
| Functional Group: | Amino phosphonic |
| Ionic Form as Shipped: | Na |
| Physical Form: | Spherical, hard, tan beads |
| Particle diameter: | 550 ± 50 μm |
| Particle density: | 1.1 to 1.14 g/mL |
| Coefficient Uniformity | 1.3 |
| Moisture Content: | 64 to 69% |
| Swelling (approx): | H+ to Na+ 45% |
| Backwash settled density: | 720 to 760 g/liter |
| Swelling (approx): | H+ to Na+ 35% |
| Total Exchange Capacity: | 1.75 eq/L |
| Shipping Weight: | 755 g/L |
Recommended Operating Conditions
| Maximum Temperature: | 80°C (180°F) in non-aqueous media |
| pH Range: | dependant on application |
| Bed Depth: | 700 mm (2.3 ft) |
| Service Flow Rate: | Up to 5 US GPM per cubic foot |
| Regeneration (HCl): | 1 to 2N |
| Conversion to Na+ form: | 1 to 4% NaOH at flowrate of 2 to 4 BV/h |
CR 2012 Features
Superior Physical Stability
The macroporous structure, with high divinylbenzene content and uniform particle size, provides greater resistance to bead breakage.
Long Life
Strong and durable beads ensure long service life.
Reliability
Aldex Chemical has over 40 years of field usage by thousands of customers in water, wastewater, and specialty purification market segments.
Applications
Brine Purification
Aldex CR 2012 can be used in the removal of trace quantities of Calcium, Magnesium, and other bivalent metal cations from brine.
Zinc Separation
Aldex CR 2012 can be used in the separation of zinc from media.
Lead Separation
Aldex CR 2012 can be used for lead removal from industrial effluents.
Application Specifications
The Aldex CR 2012 characteristic reaction:
R–CH2–NH–CH2–PO3Na2 + M2+ → R–CH2–NH–CH2–PO3M + 2 Na+
Aldex CR 2012 relative affinity for the various cations decreases in the order shown below:
Pb2+ > Cu2+ > Zn2+ > Mg2+ > Ca2+ > Cd2+ > Ni2+ > Co2+ > Sr2+ > Ba2+
Aldex CR 2012 can operate in a neutral, acidic, or alkaline medium. Its capacity, however, is dependant on the pH level. The following chart shows minimum pH values recommended for various cations:
| Minimum pH | ||||
| Cations | 2 | 2.5 | 3 | 4.5 |
| Cu2+ | Zn2+ | Cd2+ | Mg2+ | |
| Pb2+ | Ca2+ | Ni2+ | ||
| Co2+ |
Backwash Characteristics
Fig. 1 Expansion vs Flow Rate at specific gravity
Pressure Drop
Fig. 2 Pressure Drop vs Flow Rate in Brine solution
Safety Information
A material safety data sheet is available for Aldex CR 2012. Copies can be obtained from Aldex Chemical Co., LTD. Aldex CR 2012 is not a hazardous product and is not WHMIS controlled.
Caution: Acidic and basic regenerant solutions are corrosive and should be handled in a manner that will prevent eye and skin contact. Before using strong oxidizing agents in contact with ion exchange resin, consult sources knowledgeable in the handling of these materials.