Aldex Weak Acid Cation Series
WAC MP FG Macroporous Weak Acid Cation Resin
Tested and certified by WQA according to NSF/ANSI/CAN 61 and 372, and NSF/ANSI 44. Aldex WAC MP FG is a premium grade, weakly acidic, macroporous, acrylic-based cation exchange resin supplied in the hydrogen form. The high total exchange capacity, excellent mechanical and chemical stability, and high resistance to osmotic shock make this the resin of choice for dealkalization and chemical processing applications. Increased regeneration efficiency can be achieved when Aldex WAC MP FG is used in conjunction with Aldex C-800H in demineralization systems, either as a layered bed or preceding the strong acid cation vessel.
Aldex WAC MP FG Technical Bulletin: US units (PDF)
Physical Chemical Properties
| Polymer Structure: | Acrylic / divinylbenzene copolymer |
| Functional Group: | R-(COOH)- |
| Ionic Form as Shipped: | Hydrogen |
| Physical Form: | Tough, spherical beads |
| Screen Size Distribution: +16 mesh -50 mesh | 16 to 50 mesh Less than 5% Less than 2% |
| Operating pH Range: | 5 to 14 |
| Moisture Content: | 45 to 55% |
| Solubility: | Insoluble |
| Shipping Weight: | 47 lbs per cubic foot |
| Swelling H+ to Na+: | 60% maximum |
| Total Capacity: | 4.3 eq/l minimum |
| Sphericity: | 90+% |
Recommended Operating Conditions
| Maximum Temperature: | 167°F (73°C) |
| Bed Depth: | 30” minimum |
| Service Flow Rate: | 2 to 5 US GPM per cubic foot |
| Backwash Flow Rate: | 50 to 75% bed expansion |
| Backwash Flow Rate: 50 to 75% bed expansion Regenerant Strength*: Hydrochloric acid Sulfuric acid | 3 to 6% 0.5 to 0.8% |
| Regenerant Flow Rate: | 0.3 to 0.75 US GPM per cubic foot |
| Regenerant Contact Time: | 30 minutes minimum |
| Regenerant Dosage Level: | Depends on alkalinity |
| Displacement Rinse: | 0.3 to 0.75 US GPM per cubic foot |
| Displacement Rinse Volume: | 10 to 15 Gallons per cubic foot |
| Fast Rinse Rate: | 2 to 5 US GPM per cubic foot |
| Fast Rinse Volume: | 35 to 60 Gallons per cubic foot |
*Caution: Do not mix ion exchange resins with strong oxidizing agents. Nitric acid and other strong oxidizing agents can cause explosive reactions when mixed with organic materials, such as ion exchange resins.
WAC MP FG Features
Carboxylic Functional Groups
Give extremely high regeneration efficiencies and high operating capacities.
Superior Physical Stability
90% plus sphericity and high crush strengths together with a very uniform particle size provide greater resistance to bead breakages and maintaining low-pressure drops.
Low Swelling
Less than 60% on complete exhaustion to the sodium form.
Safety Information
A material safety data sheet is available for Aldex WAC MP FG. Copies can be obtained from Aldex Chemical Co., LTD. Aldex WAC MP FG 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.
Pressure Drop
The graph below (Fig 1.) shows the expected pressure loss per foot of bed depth as a function of flow rate, at various water temperatures.
Fig. 1 Pressure Drop vs Flow Rate at various degrees Fahrenheit (F°)
Backwash Characteristics
After each cycle, the resin bed should be backwashed at a rate that expands the bed 50 to 75 percent. This will remove any foreign matter and reclassify the bed. (Fig 2.)
Fig. 2 Expansion vs Flow Rate at various degrees Fahrenheit (F°)
Applications
Demineralization
Aldex WAC MP FG can be used to remove cations associated with alkalinity in multiple-bed demineralizers.
Softening
In certain applications, Aldex WAC MP can be operated as a softener in the sodium cycle. This requires a two-stage regeneration using a strong acid first stage to remove multivalent ions from the bed followed by a neutralization rinse with an alkali.
Dealkalization
Bicarbonate alkalinity can be effectively removed using Aldex WAC MP in the hydrogen form.
Operating Capacity
