Sulfate-selective anion exchange resins for use in...

Liquid purification or separation – Processes – Ion exchange or selective sorption

Reexamination Certificate

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C210S673000, C210S683000

Reexamination Certificate

active

11225942

ABSTRACT:
An improved system of resins comprising a combination of a sulfate-specific strongly basic anion exchange resin and a heterogenous hybrid thermally regenerable salt sorbent (TRSS) resin is provided. The anion exchange resin contains triethylamine and/or tributylamine groups. The TRSS resin comprises a macroporous host copolymer and a crosslinked guest copolymer having, respectively, weak acid groups and weak base groups. The system is used to treat feed water containing dissolved ions, including sulfate ions, and is efficiently regenerated.

REFERENCES:
patent: 4184948 (1980-01-01), Dabby et al.

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