Deionized water is a reverse osmosis scale inhibitor that passes water through a cation exchange resin (usually a styrene-type strongly acidic cation exchange resin). The cations in the water are absorbed by the resin, and the cation H+ on the resin is displaced into the water, and The cation in the water constitutes the corresponding inorganic acid; the water containing the inorganic acid is then displaced into the water by an anion exchange resin (usually a styrene-type strongly basic anion) OH-, and combined with H+ in water to form water. That is, deionized water. Deionized water has a very wide range of uses in modern industry. The use of deionized water is one of the important means to improve the quality of products in many industries in China and to catch up with the world's advanced level. Since the number of ions in deionized water can be artificially controlled, the physical, chemical, and pathological indexes such as resistivity, solubility, corrosivity, and viral bacteria are well controlled. In industrial production and laboratory experiments, if the process involving the use of water is used with deionized water, many parameters will be closer to the design or ideal data, and the quality of the product will become easier to control.
The ion-exchange water equipment adopts the ion exchange method to remove the cations and anions in the water state, and the sodium chloride (NaCl) represents the inorganic salts in the water. The basic reaction of water and salt removal can be expressed by the following equation:
1. Cation exchange resin: R-H+Na+ R-Na+H+
2. Anion exchange resin: R-OH+Cl-R-Cl+OH-
The total reaction formula of cation and anion exchange resin can be written as: RH+ROH+NaCl——RNa+RCL+H2O
It can be seen that the NaCl in the water has been replaced by H+ and OH- on the resin, respectively, and the reaction product is only H2O, so the effect of removing salt in water is achieved.
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