Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2007-06-26
2007-06-26
Barry, Chester T. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
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.
Colombo Gerald
Johnson Roger E.
Barry Chester T.
Kirkpatrick & Lockhart Nicholson & Graham LLP
Novation Environmental Technologies, Inc.
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