Five Common Problems Of Softening Water Resin

In food, beverage, pharmaceutical, automobile manufacturing, chemical, electronics, leather, steel, textile and many other industries, the quality of water has a very important impact on the quality of products.

Softened water can effectively improve water quality, reduce the content of calcium and magnesium ions in water, avoid scale formation, thereby reducing the energy consumption of heating and cooling equipment, reduce equipment maintenance costs, greatly improve production efficiency and product quality, but also reduce the use of chemicals, reduce costs and environmental pollution.

As we all know, the hardness of water is mainly composed of calcium and magnesium ions, softened water treatment is usually the use of ion exchange technology, the use of ion exchange resin adsorption of calcium, magnesium plasma, when the raw water containing calcium and magnesium ions through the cation exchange resin, calcium and magnesium ions in the water and sodium ions in the resin replacement, after ion exchange, Calcium and magnesium ions are adsorbed on the resin in the water softener to form softening water, so ion exchange resin is crucial in softening water treatment.

The following Xiaobian collates five common knowledge points about softening resin, it is recommended to collect.

1, the difference between sodium type and hydrogen type cationic resin

In general, ion exchange resins are divided into cationic resins and anionic resins.

The ion inside the sodium positive resin is Na+ ion, which has good anion exchange ability and can adsorb and exchange anions in water. It is mainly used in hard water softening, and sodium chloride is often used for regeneration.

The internal ions of hydrogen positive resin are H+ ions, which have stronger acidity and better anion exchange ability, and are often used to remove chloride ions and nitrate ions from water, such as the preparation of pure water and ultra-pure water, and the use of hydrochloric acid for regeneration.

2, the principle of sodium ion exchange resin softening water

In the process of softening, with the increase of calcium and magnesium ions in the resin, the efficiency of the resin to replace calcium and magnesium ions gradually decreases. When the resin absorbs a certain amount of calcium and magnesium ions, it must be regenerated. The regeneration process is to wash the resin layer with salt water in the salt box, replace the hardness ions on the resin, and discharge the recycled waste liquid outside the tank. The resin resumes its softening exchange function.

The exchange process reaction principle is as follows:

2RNa+Ca2+=R2Ca+2Na+

2RNa+Mg2+=R2Mg+2Na+

That is, after the water passes through the sodium ion exchanger, the Ca+ and Mg+ in the water are replaced by Na+

3, food soft water resin VS industrial soft water resin

Food soft water resin pays more attention to safety issues, with high regeneration efficiency, long service life, strong adsorption capacity, good anti-pollution, low content of dissolved matter;

Industrial soft water resin pays more attention to mechanical strength, and has the characteristics of high mechanical strength, good physical and chemical stability, high exchange capacity, small density change, wide operating temperature range, and can be reused many times.

4, high salt water calcium magnesium should choose what resin

In practical applications, calcium and magnesium ions in water are often interfered with by other factors, thus affecting the removal efficiency of calcium and magnesium ions, such as the removal of calcium and magnesium ions in high-salt wastewater.

In the process of high brine treatment, there will be high calcium and magnesium ions before the high brine enters the membrane system or evaporator, resulting in a decrease in the water production rate of the membrane system, and the structure of the evaporator heat exchange system affects the use effect. A large-hole weakly acidic cation exchange resin can be used to replace calcium and magnesium ions in the water with sodium ions. In order to avoid scaling ions after membrane concentration or evaporation concentration will precipitate and adhere to the membrane or tube wall, forming hard scale and resulting in reduced membrane and evaporation water production efficiency and other problems.