At brine electrolysis plants, aqueous solutions of sodium chloride are processed to generate sodium hydroxide (caustic soda) and chlorine, which are commonly used as base chemicals in a wide range of industries such as textile, pulp & paper, and oil and petroleum refineries. Due to the high energy consumption and costs incurred from this process, it is important to recover the brine for reuse. Nanofiltration is suitable for high sulfate rejection and purging of impurities present for brine reprocessing. Compared to chemical treatment such as barium precipitation, membrane process lowers the operating cost and benefits the environment.
Synder’s NFX membrane provides optimal sulfate rejection and can produce effluent suitable for discharge to local streams. Given the nature of the nanofiltration membrane, the brine salt and water passes through into the permeate, while the sulfate is kept in the retentate; efficiently remove any sulfate impurities that may be present.
Benefits of membrane processes:
- Reuse of brine for processing
- Operating cost reductions
- Small footprint and ability to meet environmental discharge regulations