Gel ion exchange resin trap screen
Type: Wedge wire screen
Bluslot provides customized services for the wedge wire screen of the gel ion exchange.
Gel type ion exchange resin is a kind of ion exchange resin, which is made from pure monomer mixture by condensation or polymerization. The ionic exchange resin with transparent appearance and homogeneous gel structure is collectively referred to as gel type resin. It is generally used in water treatment.
Gel type ion exchange resin is a kind of ion exchange resin, which is made from pure monomer mixture by condensation or polymerization. The ionic exchange resin with transparent appearance and homogeneous gel structure is collectively referred to as gel type resin. Generally used in water treatment. In general, spherical matrix is synthesized by suspension polycondensation or copolymerization process, and then activated by chemical reaction and introduced ion exchange group.
The ion exchange resin made by ordinary polymerization is made up of many irregular network polymers, similar to gel, so it is called gel type resin. The common gel resins include styrene, 001, 201, etc.
Gel type ion exchange resins can be divided into five types: strong acid, weak acid, strong alkaline, weak alkaline and chelating. Strong acid styrene cation exchange resin, model 001. Weak acidity is divided into acrylic acid cation exchange resin (model 111 and 112) and phenolic cation exchange resin (model 122). Strong base is divided into strong base quaternary amine type I anion exchange resin, model 201 (there are strong base type II abroad). The weakly alkaline weakly basic styrene anion exchange resin has 301 and 303. weakly basic epoxy resin anion exchange resins. The model has 331. gel chelating carboxylic acid ion exchange resin, and the model has 401.
The skeleton structure of gel resin is microporous. Ion exchange reaction is carried out by diffusion of pores (micropores) formed by the distance between crosslinked macromolecular chains to the exchange group. The micropores decrease with the increase of crosslinking degree and increase with the swelling of the gel. When the resin is dry, the pores do not actually exist. There is no physical hole (Mao Xikong) in the gel resin, but only chemical holes exist. When the gel resin is polymerized, it is necessary to join the crosslinking agent and control the change of the number of crosslinking agents, so that the corresponding pores can be formed in the resin, and the pore size is between 0.5 and 5nm. It is mainly used to adsorb anions and cations in water, and its adsorption capacity for organic matter is very weak. It is easy to be polluted and aged, and its specific surface area is less than 0.1m/g dry resin. The appearance is transparent spherical particles.
- The exchange capacity of gel resin is higher than that of macroporous resin, and its synthetic process is relatively simple. Macroporous resins need to be added with inert organic solvents as pore forming agents when polymerization. After polymerization, solvent extraction is removed and then chemical reaction activation is applied to introduce ion exchange groups. Therefore, macroporous resin synthesis process and corresponding postprocessing are more complex than gel resin. In addition to high flow rate water treatment systems, gel type ion exchange resins are commonly used in general water treatment.
- The average pore size of the resin is about 1 ~ 2 nm, and the size is different. In the dry state, these meshes do not exist. When the resin is immersed in water, the pores appear in the swelling process of the resin particles.
- Because the diameters of inorganic ions are very small (0.3 ~ 0.7nm), they can be removed by ordinary gel type resins. But when organic molecules exist in the water, because of their large molecules (the size of the silicone compound is larger than 50nm, some protein molecules are 5 to 20nm), it is difficult to remove them with ordinary gel resins. Moreover, these adsorbed organic matters are not easy to be regenerated when they are regenerated, so the gel type resins are easily contaminated by organic matters.