Process for regenerating and protonating a weak-base anion exchange resin

US7875186B2 · kind B2 · utility

Assignees

• Applied Research Associates, Inc. · US
• Brotech Corporation · US

Inventors

• Edward N. Coppola · Panama City, US
• John Baxley · Dunwoody, US
• Andrea Davis · Panama City, US
• Francis Boodoo · King of Prussia, US
• William Fries · Southampton, US
• James A. Dale · Cardiff, GB

Key dates

• Filing date: Nov 23, 2005
• Grant date: Jan 25, 2011
• Expiry date: Apr 7, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C02F2301/043
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention consists of a water treatment process using selective and regenerable weak base anion exchange resins to remove any number of complex anions, especially oxyanions including perchlorate, nitrate, chlorate, arsenate, selenate, and chromate, from aqueous solutions. The treatment process is comprised of three key processes including 1) pretreatment to lower pH, 2) ion exchange, and 3) post treatment to adjust pH and alkalinity. The invention also includes processes for regenerating weak base anion resins and treatment of the residuals generated. This invention employs pressurized treatment, carbon dioxide management, and reuse of regenerating solution to minimize pumping and treatment costs.