Weak Acid Cation Ion Exchange Resin Selective Removal of Divalent Cations

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Weak Acid Cation Ion Exchange Resin Selective Removal of Divalent Cations

Pure Resin PA202 Nitrate Removal Anion Exchange Media for Water Treatment

Weak Acid Cation Ion Exchange Resin Selective Removal of Divalent Cations

Weak Acid Cation (WAC) Ion Exchange Resin is an insoluble polymer containing carboxylic acid (-COOH) functional groups. It exhibits a high affinity for divalent cations associated with alkalinity, particularly calcium and magnesium bicarbonate, but only operates effectively within a near-neutral to alkaline pH range. Its exchange reaction is stoichiometric, requiring an amount of acid for regeneration equivalent to its exchange capacity.

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DESCRIPTION

Product Description

Weak Acid Cation (WAC) Ion Exchange Resin is an insoluble polymer containing carboxylic acid (-COOH) functional groups. It exhibits a high affinity for divalent cations associated with alkalinity, particularly calcium and magnesium bicarbonate, but only operates effectively within a near-neutral to alkaline pH range. Its exchange reaction is stoichiometric, requiring an amount of acid for regeneration equivalent to its exchange capacity.

Applications

Alkalinity Removal & Dealkalization: Selectively removes calcium and magnesium associated with bicarbonate alkalinity, effectively dealkalizing water without adding sodium.
Hardness Removal in High-Alkalinity Water: Used for partial softening when the primary goal is to remove bicarbonate hardness.
Water Recycling & Zero Liquid Discharge (ZLD): Often used as a pre-treatment step to reduce scaling potential in reverse osmosis (RO) systems by removing hardness and associated alkalinity.
Sugar & Beverage Industry: Employed for the de-ashing and purification of sugar syrups, fruit juices, and other food products.
Whey Demineralization: Crucial in the dairy industry for the partial demineralization of whey, improving its nutritional and functional properties.

Reference Indicators for Use

Note: These are general guidelines. Specific parameters must be confirmed with the manufacturer's data sheet for the particular resin.

1. Operating Conditions

Service Flow Rate: 5 - 20 BV/h (Bed Volumes per hour).
Influent Water Quality: Most effective on waters with a hardness-to-alkalinity ratio close to 1.
pH Range: Requires influent pH > 4.5 (typically 6.0 - 9.0) to remain in the ionized (-COO⁻) form for effective operation.
Operating Temperature: Up to 120°C.

2. Regeneration

Regenerant: Hydrochloric Acid (HCl) or Sulfuric Acid (H₂SO₄).
Regenerant Concentration: HCl: 0.5 - 2.0%; H₂SO₄: 0.5 - 1.0% (to prevent calcium sulfate precipitation).
Regenerant Dosage: Near stoichiometric, approximately 105-110% of the theoretical requirement.
Regeneration Flow Rate: 2 - 5 BV/h.
Contact Time: 20 - 60 minutes.

3. Rinsing

Rinse Flow Rate: Slow rinse at regen flow rate, then fast rinse at service flow rate.
Rinse Volume: Approximately 2 - 4 Bed Volumes for fast rinse.

4. Physical & Chemical Properties

Total Capacity: ≥ 4.5 eq/L (H⁺ form).
Moisture Content: 45 - 55%.
Ionic Form as Shipped: H⁺ (Hydrogen) form.
Swelling: Exhibits significant volume change (swelling/shrinking) between H⁺ and Ca²⁺/Mg²⁺ forms, which must be considered in vessel design.

5. Important Considerations

pH Sensitivity: Cannot operate in acidic conditions (pH < 4.5) as the functional groups will protonate and lose their exchange capability.
Limited Cation Removal: Only removes cations associated with alkalinity (primarily Ca²⁺ and Mg²⁺ as bicarbonates). It does not remove permanent hardness (chlorides, sulfates) or sodium.
Swelling Management: The substantial volume change during service and regeneration cycles requires careful design of the freeboard space in the ion exchange column.

ADVANTAGES

201X4 FG Strong Acid Cation Exchange Resin INDEX

Product advantages

High Efficiency for Bicarbonate Hardness: Exhibits a very strong preference for cations associated with bicarbonate (temporary hardness), leading to highly efficient dealkalization.
High Total Exchange Capacity: Possesses the highest theoretical exchange capacity of all cation resins (typically > 4.0 eq/L), resulting in long service runs.
Easy and Efficient Regeneration: Can be regenerated with stoichiometric or near-stoichiometric amounts of a weak acid (e.g., HCl, H₂SO₄), making it highly efficient and cost-effective with minimal regenerant waste.
Salt Tolerance: Performs well in waters with high TDS (Total Dissolved Solids) where strong acid cation (SAC) resins would be inefficient.
Environmental Friendliness: The regeneration process produces non-toxic byproducts (e.g., carbon dioxide and water), making it an environmentally benign process.

PACKING

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50kg Plastic Barrel

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With 28 years in water treatment and 16 years of international market experience, UMEK delivers one-stop solutions trusted in over 120 countries for efficient and reliable results. As the largest industrial water treatment wholesaler in the north, backed by 30+ professionals and a unique culture of mentorship and excellence, we are committed to providing high-quality products and customized services.

We partner with top-tier suppliers like Runxin Valve and Pentair, ensuring certified products with strict quality control. UMEK also offers a value-driven environment, comprehensive training, and growth opportunities, empowering employees and achieving mutual success. Choose UMEK – your partner in expertise, innovation, and sustainable development!

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A1. Why choose UMEK for industrial water treatment solutions?

Q: With 28+ years in water treatment and 16+ years of global expertise, UMEK combines innovation, certified quality, and tailored services. As the largest wholesaler in the north, we deliver trusted solutions across 120+ countries, backed by 30+ professionals and partnerships with industry leaders like Runxin Valve and Pentair.

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A3. Can UMEK provide customized water treatment solutions?

Q: Absolutely. We specialize in tailored services, designing systems to meet unique client needs. Our team collaborates closely with you to ensure optimal efficiency, cost savings, and compliance.

A4. How does UMEK ensure product quality?

Q: Every product is rigorously inspected, tested, and certified. We work exclusively with vetted suppliers like Runxin Valve and Pentair, adhering to international quality benchmarks at every production stage.

A5. What industries does UMEK serve internationally?

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A6. Does UMEK prioritize sustainability in its solutions?

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