Macroporous weakly basic acrylic anion exchange resin

Macroporous weakly basic acrylic anion exchange resin is a specialized type of ion exchange material designed for efficient separation and purification processes, with its core value lying in targeted removal of strong acid anions while maintaining the integrity and yield of target substances (such as organic acids). As a member of the acrylic-based ion exchange resin family, it is distinguished by its macroporous structure and weakly basic functional groups—features that enable it to balance high exchange efficiency with gentle interaction, making it ideal for applications requiring mild processing conditions.
This resin typically has a matrix composed of macroporous acrylic copolymers (crosslinked with divinylbenzene), which endows it with excellent physical stability and resistance to osmotic shock. Its active functional groups are mainly in free amine form (or tertiary amine form for some variants), allowing it to readily undergo neutralization reactions with strong acid anions (e.g., chloride, sulfate) during the exchange process. After adsorption saturation, it can be regenerated using alkaline solutions (such as sodium hydroxide), where the resin reacts with the alkali to form salts and water, reverting to its free amine form for repeated use. This reversible regeneration capability significantly reduces operational costs and minimizes waste generation, aligning with the principles of green chemistry and sustainable industrial practices.
In industrial contexts, this type of resin addresses a critical need: the purification of organic acids (e.g., citric acid, lactic acid, tartaric acid, malic acid) without compromising their quality or yield. Traditional purification methods often involve harsh chemical treatments or energy-intensive processes, but macroporous weakly basic acrylic anion exchange resin offers a more efficient, low-impact alternative—making it a key material in food processing, pharmaceutical manufacturing, and fine chemical industries.

Keep sealed at room temperature.

It is used for refining and decolorization in sugar and other food industries, decolorization and refining of stevia, ginseng saponin, panax ginseng saponin, antibiotics and other natural medicines.

Superior Physical Stability: Built on a macroporous acrylic copolymer matrix, the resin exhibits high mechanical strength and excellent resistance to osmotic shock. This ensures that the resin particles remain intact during repeated cycles of adsorption, regeneration, and backwashing, leading to low annual 补充率 (supplementation rate) and stable long-term operation.
Optimized Functional Group Performance: With free amine (or tertiary amine) as the active functional group, the resin shows strong selectivity for strong acid anions while having minimal interaction with weak organic acids. This selectivity guarantees effective removal of impurities (e.g., strong acid anions) without causing significant loss of target organic acids.
High Exchange Capacity: It boasts impressive exchange capacity, with volume-based total exchange capacity typically reaching ≥2.20 mmol/ml (and up to ≥2.8 eq/L for some high-performance variants) and mass-based total exchange capacity (dry basis) of ≥7.0 mmol/g. This high capacity allows for larger feed liquid processing volumes per cycle, improving operational efficiency.
Fast Exchange Kinetics: The macroporous structure provides abundant channels for ion diffusion, accelerating the exchange rate between the resin’s functional groups and the anions in the feed liquid. This fast kinetics shortens the processing time and enhances the throughput of separation systems.
Efficient Regeneration: Under standard regeneration conditions, the resin achieves high regeneration efficiency and elution rate. It requires lower regenerant consumption (e.g., less alkaline solution) compared to some other ion exchange resins, reducing operational costs and environmental impact.
Controlled Particle Size Distribution: The resin typically has a particle size range of 0.315–1.25 mm (or 300–1200 µm), with a whole bead count of ≥95%. This uniform particle size ensures consistent flow distribution in the resin bed, minimizing pressure drop during operation and preventing uneven adsorption.
Wide Temperature Adaptability: It maintains stable performance within a reasonable temperature range (operation temperature ≤40°C for most variants, with some able to tolerate slight fluctuations), making it suitable for industrial processes with mild temperature variations.

In the field of ion exchange resins and sustainable separation materials, customers interested in macroporous weakly basic acrylic anion exchange resin may also be interested in other complementary or functionally similar products. These include macroporous strong basic acrylic anion exchange resins (for applications requiring removal of both strong and weak acid anions), macroporous weakly basic styrene-based anion exchange resins (offering alternative matrix properties for specific process compatibility), and natural polysaccharide-based separation materials (such as chitosan, cellulose, and sodium alginate) that are used in eco-friendly separation processes aligning with green chemistry principles. Additionally, green chemical auxiliaries and water treatment chemicals—designed to enhance process sustainability and efficiency—are also relevant to customers seeking comprehensive purification and processing solutions. If you are interested in related products, you can contact us directly or request product customization services.