Sulfate-selective anion exchange resins for use in combination with TRSS resins in feed water treatment
US7235180B2 · kind B2 · utility
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Key dates
| Filing date | Sep 13, 2005 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Sep 13, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J49/57
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.