Nickel absorption chelating resin, macroporous chelating calcium ion membrane, alkali removal of calcium and magnesium resin

Nickel absorption chelating resin, macroporous chelating calcium ion membrane, alkali removal of calcium and magnesium resin
1、 Product Introduction:
D418 is a styrene divinylbenzene copolymer with a weakly acidic amino phosphonic acid group (- CH) on a special macroporous structure₂NHCH₂PO₃-Chelating resin. This product can fix or chelate one or several specific cations over a wide range, even from high concentration solutions. Mainly used for the separation and recovery of heavy metal ions, especially suitable for the secondary refining of salt water in the production process of ion exchange membrane alkali, using the penetration of calcium and magnesium ions as the control standard, with high selectivity for calcium and magnesium.

2、 Physical and chemical performance indicators:

Nickel absorption chelating resin, macroporous chelating calcium ion membrane, alkali removal of calcium and magnesium resin
The products produced by the company include six major series of dozens of fine chemicals, including ion exchange resins, circulating water treatment agents, boiler auxiliaries, reverse osmosis membrane agents, atmospheric pollution control agents, and sewage treatment agents. They are widely used in the fields of steel industry, petrochemical industry, thermal power industry, papermaking industry, microelectronics industry, pharmaceutical industry, printing and dyeing industry, and three waste treatment
Organic pollution and treatment methods of resin/

1. The adsorption force of strong alkaline anion resin on organic matter. After H+exchange and carbon removal, almost all organic matter in natural water (represented by fulvic acid and humic acid) exists in molecular form in the influent of the anion bed due to the decrease in pH value. Due to the large molecular weight and strong hydrophobicity of humic acid, it has strong adsorption ability with the styrene divinylbenzene polymerization skeleton of strong alkali anion resin. At the same time, these large organic acids contain multiple carboxylic acid groups and have strong chemical affinity with the quaternary amine functional group of OH type strong alkali anion resin, which makes the organic acids firmly adsorbed on the particle surface by the strong alkali resin. The skeleton of the strong alkali anion resin is changed to a hydrophilic polymer of acrylic acid and divinylbenzene, which reduces the adsorption of organic acids by the skeleton and slightly reduces the adsorption rate of organic acids. If the OH type strong base anion resin is changed to Cl type, the acid-base neutralization reaction between the organic acid and the OH of the strong base anion resin is altered, resulting in a decrease in chemical affinity and a decrease in the resin's adsorption rate for organic matter. This type of functional group has a greater impact on the adsorption of organic compounds than on the skeleton material.

ion exchange resin

2. Regeneration and elution of organic matter. The new gel type strong base anion resin has a high adsorption rate (95%) for organic matters, but a low elution rate (15%). As the operating cycle increases, the adsorption rate remains basically unchanged, while the elution rate increases from 15% to over 60%. However, when the working exchange capacity of the resin begins to decrease, the elution rate is only 60%, indicating that organic matter continues to accumulate on the resin, which will further reduce the working exchange capacity of the resin and deteriorate the quality of the effluent.

ion exchange resin

3. The influence of organic properties. Humic acids with relatively high molecular weight, on the one hand, have poor hydrophilicity due to their large molecular weight, and on the other hand, they mainly adsorb onto the resin skeleton by van der Waals force due to their low content of - COOH, making them difficult to wash off. Fulvic acid, due to its small molecular weight and high content of - COOH, is often bound to multiple exchange groups of the resin through chemical affinity, making it easier to be eluted during the regeneration process. Organic compounds in natural water can be classified into three types based on their solubility in water: suspended, colloidal, and dissolved. For suspended organic matter that adheres to the surface of resin through physical adsorption, methods such as enhanced filtration or air scrubbing, ultrasonic cleaning, etc. can be used to remove contaminated resin. Colloidal organic compounds are generally negatively charged, with particle sizes ranging from 0.2-1.0nm. Their pollution to resins is both physical and chemical, and can be removed through coagulation clarification or ultrafiltration methods. Dissolved organic compounds are the main components that contaminate strong alkaline anion resins. They adsorb onto strong alkaline anion resins with van der Waals forces and chemical affinity, resulting in low elution rates and ultimately affecting the resin's working exchange capacity and effluent quality.

ion exchange resin

4. The impact on the working exchange capacity of resin. Due to the continuous accumulation of organic matter on the strong alkaline anion resin, on the one hand, some exchange groups are occupied, which cannot be washed out during regeneration, reducing the exchange capacity of the resin; On the other hand, these organic compounds will continuously dissolve during operation, and due to the stronger acidity of organic acids compared to H2SiO3, they resist the absorption of H2SiO3 by strong alkaline anion resins, causing H2SiO3 to leak prematurely in the effluent. Because the failure endpoint of the anion bed is determined by the excess leakage of SiO2, premature leakage of H2SiO3 will inevitably reduce the working exchange capacity of the resin. The latter only reduces the working exchange capacity of the resin, while the total exchange capacity remains unchanged.

5. The impact on effluent quality. Strong alkaline anion resins contaminated with organic matter, due to the attachment of many large organic acids, are partially replaced by mineral acids in the water, resulting in an increase in the conductivity of the effluent. This effect increases the amount of cleaning water and cleaning time on one hand, and on the other hand, the dissolution of organic acids into the effluent can also cause a decrease in effluent quality. The organic acids attached to the resin will gradually dissolve in the effluent, causing a decrease in pH and an increase in SiO2 content.

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