Description

Duolite A-7 Ion-Exchange Resin is a strongly basic anion exchange resin, widely recognized for its high capacity and stability. This product is essential for processes requiring the selective removal of anions, such as nitrate, sulfate, and chloride, from aqueous streams. It is a critical component for industries focused on water purification, hydrometallurgy, and the production of high-purity process streams.

Application

• Industrial Water Demineralization: Key component in mixed-bed or separate-bed deionization systems to produce high-purity water for power generation, manufacturing, and laboratory use.
• Nitrate Removal: Specifically effective for the targeted removal of nitrate ions from drinking water and groundwater to meet stringent safety standards.
• Chemical Processing: Used for the purification and recovery of acids, the separation of metals in hydrometallurgical applications, and as a catalyst in organic synthesis reactions.
• Sugar & Sweetener Refining: Employed in decolorization and deashing steps to remove organic acids and ionic impurities, improving product quality and yield.
• Pharmaceutical Purification: Used in the purification of antibiotics, vitamins, and other active pharmaceutical ingredients (APIs) by removing ionic contaminants.
• Wastewater Treatment: Effective for the removal of toxic anions like chromate, arsenate, and perchlorate from industrial effluent.

Basic Information

Product Name	Duolite A-7 Ion-Exchange Resin
CAS No.	32610-77-8
Molecular Formula	(C8H8·C7H7N·CH2Cl)n
Molecular Weight	N/A (Polymeric Resin)
Synonyms	Duolite A-7; Amberlite IRA-400; Strongly Basic Anion Exchange Resin Type I; Polystyrene Quaternary Ammonium Resin; Anion Exchange Resin (Chloride Form); Dowex 1; Lewatit M 500; Purolite A-400
EINECS	Contact for details

Quality Control

Our Duolite A-7 Ion-Exchange Resin is manufactured under a strict quality management system. Each batch is tested to ensure it meets critical performance parameters such as total exchange capacity, moisture holding capacity, particle size distribution, and ionic form. A Certificate of Analysis (COA) detailing these specifications is provided with every shipment to guarantee consistency and performance for your application.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); ensure the original packaging is sealed after use to prevent moisture uptake, which can affect performance. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Spherical, translucent beads
Ionic Form (as shipped)	Chloride (Cl⁻)
Total Exchange Capacity	≥ 1.0 eq/L (min)
Moisture Holding Capacity	50 - 60 %
Particle Size Range (0.3 - 1.2 mm)	≥ 95 %
Uniformity Coefficient	≤ 1.7
Reversible Swelling (Cl⁻ → OH⁻)	15 - 25 %
Maximum Operating Temperature	60 °C (OH⁻ form), 100 °C (Cl⁻ form)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.