Product Details

Ultra-pure water edi, also known as electro-desalination, skillfully combines electrodialysis technology and ion exchange technology, through the selective permeation of anion and cation by the anion and cation exchange membranes and the ion exchange resin for ion exchange, Under the action of a direct current electric field, the directional migration of ions is realized to complete the deep desalination of water. At the same time, the hydrogen ions and hydroxide ions generated by the ionization of water regenerate the ion exchange resin, so it can be continuously produced without acid-base chemical regeneration. Take ultrapure water.

reaction process
The ultrapure water EDI exchange reaction is carried out in the purification laboratory of the module, where the anion exchange resins exchange their anions in the dissolved salts with their hydroxides according to ions (OH). Correspondingly, cation exchange resins use their hydrogen ions (H) to exchange cations (such as Na) in dissolved salts.

A DC electric field is applied between the anode (+) and cathode (-) located at both ends of the module. The electric potential causes ions exchanged on the resin to migrate along the surface of the resin particles and enter the concentrated water chamber through the membrane. The anode attracts negatively charged ions (such as OH, CI). These ions enter the adjacent concentrated water stream through the anion membrane but are blocked by the cation selective membrane, thereby remaining in the concentrated water stream. The cathode attracts cations (eg H, Na) in the pure water stream. These ions pass through the cation-selective membrane and enter the adjacent concentrated water stream, but are separated by the anion membrane and remain in the concentrated water stream. When water flows through these two parallel chambers, ions are removed in the pure water chamber and accumulate in the adjacent concentrated water stream, which is then taken away from the module by the concentrated water stream. The use of ion exchange resins in pure and concentrated water is the key to ElectropupreEDI technology and patents. An important phenomenon occurs in ion exchange resins in pure water chambers. In the local area where the potential difference is high, the water decomposed by the electrochemical reaction generates a large amount of H and OH. The generation of local H and OH in the mixed bed ion exchange resin allows the resin and membrane to be continuously regenerated without adding chemicals.

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