METHOD FOR SEPARATING AND REGENERATING ANION EXCHANGE RESIN AND CATION EXCHANGE RESIN IN ION EXCHANGE RESIN MIXTURE

WIPO Patent Application WO/2024/075500

A1

This method for separating and regenerating an anion exchange resin and a cation exchange resin in an ion exchange resin mixture according to the present invention involves usage of a three-column configuration including a separation column, a cation exchange resin regeneration column, and a seprex column. In a separation step performed in the separation column, the anion exchange resin and the cation exchange resin are separated. The separated anion exchange resin is transferred to the seprex column for separating and removing the cation exchange resin included therein by using a high-concentration aqueous NaOH solution having a specific gravity that is between those of the anion and cation exchange resins, and is also subjected to a regeneration treatment. In addition, the cation exchange resin separated in the separation step in the separation column is transferred to the cation exchange column in which a HCl solution is injected to regenerate the cation exchange resin. By such a method for separating and regenerating an anion exchange resin and a cation exchange resin in an ion exchange resin mixture, the anion exchange resin and the cation exchange resin can be precisely separated using a seprex method without an increase in initial cost.

WO/2018/044702	LOW-SODIUM RESIN
WO/2018/211794	CONDENSATE DEMINERALIZATION DEVICE

OGAWA YUUICHI (JP)
MIYAJI MIDORI (JP)

PCT/JP2023/033719

April 11, 2024

September 15, 2023

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KURITA WATER IND LTD (JP)

B01J49/09

JP2006159013A	2006-06-22
JPS5528738A	1980-02-29
JPS62204854A	1987-09-09
JP2014198287A	2014-10-23
JPH04293553A	1992-10-19

HAYAKAWA Yuzi et al. (JP)

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