Why deionizers product water does not meet demand

Deionizer is system that uses anion and cation exchange resin to exchange ions in the water and filters to remove it. The conductivity of the product water depends mainly on the use of anion and cation exchange resin.

However, in ion exchange equipment, anion exchange resin, Compared with the use of cation exchange resin, it is more delicate, so the unreasonable conductivity of the product water of deionizer depends more on the use of the anion exchange resin.

The main reasons for the low regeneration efficiency of anion resin are:

1 During regeneration, the temperature of the lye is relatively low, the viscosity is large, the chemical activity is poor, and the regeneration effect is poor, but the heating should be moderate. Excessive heating will decompose the exchange group of the anion resin, and the resin will also deteriorate and become invalid. The temperature range for heating the alkali is: 35-50 degrees Celsius for strong alkaline anion resin (type 1), 30-40 degrees Celsius for strong alkaline anion resin (type 2); 25-30 degrees Celsius for weak alkaline anion resin Preferably, at the above temperature, it is easiest to replace HSIO3 in the anion resin and increase the working exchange capacity of the anion resin. For every 1 degree Celsius increase in the temperature of the regenerated liquid, the working exchange capacity can be 0.6%, and the silicon removal effect can be increased by 1.7%.

2 There are many impurities in the regeneration solution. If the content of sodium chloride, carbonic acid and heavy metals in the lye is high, the regeneration efficiency of the anion bed will also be reduced. Sometimes the alkali enters more iron during storage or transportation. Quality, which will pollute the anion resin and reduce the regeneration efficiency.

3 The organic pollution of the anion resin and the deposition of polymer colloidal silicon are difficult to eliminate by regeneration, so the regeneration efficiency is low.

4 During regeneration, the concentration of lye is low and the flow rate of regeneration is too slow, which will reduce the regeneration effect.

5 The chemical stability of the anion resin is poor, and it is easily corroded by oxidants, especially the quaternary ammonium of the quaternary ammonium type strong alkaline anion resin is oxidized to tertiary, secondary, and primary amines, which degrade the exchange group and weaken the alkalinity. The regeneration effect is poor.

More inquiries related to Deionizer please contact:

Mob& Wechat& WhatsApp: (+86)13544774483

Email: sales010@water-sy.com

We will provide high-quality, all-round comprehensive professional services for project consulting, system design, manufacturing, installation and commissioning, personnel training, etc