Electronic industry ultrapure water equipment technology and precautions

High purity water, also known as ultrapure water, refers to water with very high chemical purity. It is mainly used in biological, chemical and chemical industries, metallurgy, aerospace, electric power and other fields. However, its purity requirements for water quality are quite high. Therefore, the most common application is electronic industry.

In the production of ultrapure water equipment, the anion and cation in the water can be removed by electrodialysis, reverse osmosis and ion exchange technologies. The particles in the water can generally be removed by techniques such as ultrafiltration and membrane filtration. The bacteria in water, Use dosing or ultraviolet light irradiation or ozone sterilization method to remove; TOC in water is generally treated with activated carbon, reverse osmosis. In the field of high-purity water, the purity of water is directly related to the performance and reliability of the device. Therefore, the high-purity water requires high purity and precision.

● use of ultra-pure water equipment

Ion exchange mixed bed through the ion exchange resin in the electrolyte solution, can remove various kinds of anion and cation in water, is currently the preparation of ultrapure water process irreplaceable means. Ion exchanger is divided into cation exchanger, anion exchanger and so on. When the raw water passes through the ion exchange column, the anions (HCO3-plasma) in the water and the H + ions in the water exchange with the H + ions of the cation resin and the anion resin of the anion exchange resin to achieve desalination. Different combination of positive and negative mixed column can achieve higher water quality requirements, to achieve a higher standard of ultrapure water.

Ion exchange method is widely used at home and abroad water system is an ideal method, but also the most cost-effective chemical method, ion exchange is a kind of use of the exchange of yin and yang resin ion selective and balanced reaction principle, the removal of electrolytes in water Ion technology. Is a complete set of mature water technology, is now widely recognized by the majority of users.

Regeneration activation principle: When the equipment is running for a period of time, the resin fails, regeneration is required at this time, so that it can resume exchange capacity.

Precautions:

1. Operators should have the basic knowledge of pure water equipment, master the rules.

2. This equipment is strictly prohibited over-pressure load.

3. The motor should be checked regularly.

4 long-term idle without, should be regularly agitated, so as not to resin mold.

  ● preparation process

1, the use of ion-exchange resin to prepare ultra-pure water, the traditional water treatment methods, the basic process: raw water → sand filter → precision filter → raw water tank → yang → bed anion → mixed bed (complex bed) → pure Water tank → pure water pump → rear precision filter → water point

2, the use of reverse osmosis water treatment equipment and ion exchange equipment for the combination of the way, the basic process is: raw water → sand filter → → → precision filter water tank reverse osmosis equipment → mixed bed (double bed) → pure water Box → pure water pump → rear precision filter → water point

3, the use of reverse osmosis water treatment equipment and electrodeionization (EDI) equipment with the way, which is a preparation of the latest technology of ultrapure water, but also an environmentally friendly, economical, huge potential for the development of ultrapure water technology , The basic process flow: raw water → sand filter → precision filter → original water tank → reverse osmosis equipment → electrodeionization (EDI) → pure water tank → pure water pump → rear precision filter → water point

  ● technical characteristics

1, the first use of ion exchange resin has the advantage of less initial investment, less occupied place, but the disadvantage is the need for frequent ion regeneration, consuming a lot of acid and alkali, but also to the environment a certain degree of damage.

2, the second use of reverse osmosis pretreatment coupled with ion exchange equipment, which is characterized by the first shot than the use of ion exchange resin to be higher, but relatively long regeneration cycle ion equipment, the cost of acid-base ratio than the simple use of ions The way of resin is much less. But the environment is still a bit devastating.

3, the third use of reverse osmosis pretreatment coupled with electrodeionization (EDI) device, which is currently the most economical preparation of ultrapure water, the most environmentally friendly process for the preparation of ultrapure water, do not need to use acid Regeneration can be made in a row of ultra-pure water, the environment is not destructive. The disadvantage is that the initial investment relative to the above two methods is too expensive.

  ● Applications

1. Semiconductor materials, devices, printed circuit boards and integrated circuits;

2. Ultra-pure materials and ultra-pure chemical reagents;

3. Laboratory and pilot plant

4 cars, appliances polished surface;

5. Other high-tech products subtle.