The ion exchange column is the equimolar molarity reaction between the ions in the water and the ions on the resin in the ion exchange column. A traditional displacement water treatment process.
The ion exchange column is mainly a method of purifying the water (liquid) by exchanging the ions in the ion exchange resin with some ions in the raw water (liquid) to remove them.
It is widely used in chemical, electronic, medical, textile and electroplating industries to produce pure water, soften hard water, decolorize and extract medicines and foods, and recover important chemical raw materials used materials and waste water treatment service.
The principle of ion exchange column
The ion exchange method can remove cations and anions in the ionic state in water and remove sodiumChloride (NaCl) represents inorganic salts in water, and the basic reaction of water desalination 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 general 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 was made up of H+ and OH- respectively absorbed, and the reaction product is only H2O, so that the effect of removing salt in the water is achieved.
3. Mixed ion exchange column (mixed bed):
The mixed bed is filled with positive and negative resins in a certain ratio (usually 1 :2), so that the positive and negative resins can reach the end point of exchange at the same time and regenerate at the same time) are loaded into the mixing column;
In fact combinated H+ and OH- in water to instantaneously form a low degree of ionization of water molecules (H2O), there is almost no reverse exchange phenomenon during the exchange of cation bed or yin bed;
So Die Exchange reaction can be carried out very thoroughly, so that the effluent quality of the mixed bed is better than the water quality that can be achieved by the composite bed of positive and negative beds connected in series, and can produce high purity finished water.