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The gel-type resins in the time of the polymerization, adding a crosslinking agent, and to control changes in the crosslinking agent on the number, making micropores in the resi n to form the corresponding pore diameter of between 5 to 50 angstroms. Mainly used to adsorb water anions and cations, organic adsorption capacity is weak. Easily contaminated aging, specific surface area <0.1 m 2 / g dry resin. Appearance transparent spherical particle.mesh screen
A macroporous resin in the synthesis process, to add an organic solvent such as aromatic hydrocarbons, aliphatic hydrocarbons, alcohols, called porogen, when the resin after polymerization, removing the solvent, i.e. in the resin, forming a plurality of large holes, the aperture in the 100 ~ 2000A (0.1X10-4mm) above, the resin within the larger pores of the sponge-like structure allows the macromolecular organic substances to be adsorbed into the resin, and the regeneration time is easily desorbed. Macroporous resin was opaque or opalescent when wet, the inner surface area of 5 m2 / g or more, depending on the density and the true density of the difference is greater than 0.05g/cm3 macroporous resin in water treatment can play adsorption, filtration, and can go to In addition to the contamination of organic matter, and to extend the life of the exchange resin. In the process of preparation of pure water, if the primary filtration, the macroporous resin to be installed in front of the ion exchange resin or a reverse osmosis unit; mainly used for adsorption, the desirability of the macroporous resin acidic water adsorption.
Small quantities of the production is still in the trial stage of macroporous resin.Vapour permeable membrane
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