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  • Preparation of ultra pure water for electronic industry

    Source: Author: time: 2016-08-15 10:56:06 browse: second

    Preparation of ultra pure water for electronic industry
    ? Preparation of ultra pure water for electronic industry

    Ultra pure water process flow chart

    The process of super water preparation in electronic industry is roughly divided into the following categories:
    1. The traditional water treatment method of preparing ultra pure water by ion exchange resin is as follows: raw water → sand carbon filter → precision filter → raw water tank → cation bed → anion bed → mixed bed (compound bed) → pure water tank → pure water pump → rear precision filter → water consumption point
    2. The combination of reverse osmosis water treatment equipment and ion exchange equipment is adopted. The basic process flow is as follows: raw water → sand carbon filter → precision filter → raw water tank → reverse osmosis equipment → mixed bed (compound bed) → pure water tank → pure water pump → rear precision filter → water consumption point
    3. The combination of reverse osmosis water treatment equipment and electrodeionization (EDI) equipment is adopted. This is a new process for preparing ultra pure water, and it is also a kind of environmental protection, economic and great development potential. The basic process flow is: raw water → sand carbon filter → precision filter → raw water tank → reverse osmosis equipment → electrodeionization (EDI) → pure water tank Pure water pump, rear precision filter and water consumption point
     
    Comparison of three processes for preparing ultrapure water for electronic industry
    At present, the preparation of ultra pure water for electronic industry is basically the above three processes, the rest of the process is mostly derived from the combination of the above three basic processes. Their advantages and disadvantages are listed as follows:
    The first advantage of ion-exchange is that it takes less acid and alkali, but it needs a lot of environment damage.
    2. For the two methods, reverse osmosis is used as pretreatment followed by ion exchange equipment. Its characteristics are that the initial commissioning time is higher than that of using ion exchange resin, but the regeneration cycle of ion equipment is relatively long, and the acid-base consumption is much less than that of using ion-exchange resin only. But it is still destructive to the environment.
    3. Three kinds of pretreatment with reverse osmosis and EDI device, which are economical and environmentally friendly, can produce ultra pure water continuously without acid and alkali regeneration, which is harmless to the environment. The disadvantage is that the initial investment is too expensive.

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