The chlor-alkali membrane separation system is an advanced separation solution designed for brine purification and resource recovery in the chlor-alkali industry.
By integrating ceramic membrane filtration with nanofiltration technology, the system efficiently removes impurities and key ions from brine, significantly improving brine quality and ensuring stable operation of the electrolysis process. In addition, it enables water reuse, helping reduce production costs and enhance environmental performance. It is well suited for optimization and upgrading of modern chlor-alkali plants.
The system is based on a multi-stage membrane separation process for deep brine purification and resource utilization
• Ceramic Membrane Filtration:
Cross-flow ceramic membranes are used as the first step, leveraging their stable microporous structure to directly remove suspended solids and particulate impurities from brine. This replaces traditional sand filtration and pre-coat filtration, simplifying the process at the source
• Nanofiltration (NF):
After primary filtration, nanofiltration membranes perform fine separation by selectively removing divalent ions such as magnesium (Mg²⁺) and calcium (Ca²⁺), ensuring the brine meets the stringent purity requirements of chlor-alkali electrolysis
• Water Recovery and Reuse:
During the membrane separation process, water is simultaneously recovered and recycled, reducing fresh water consumption and improving overall resource efficiency and sustainability
• Simplified process: Ceramic membranes replace traditional multi-stage filtration, significantly shortening the process flow
• High filtration efficiency: Suspended solids (SS) in treated brine can be reduced to less than 1×10⁻⁶, meeting high-purity requirements
• Strong anti-fouling performance: Maintains stable operation even in high concentrations of Mg(OH)₂ and BaSO₄, with low fouling tendency
• Cost advantage: Compared with organic polymer membrane systems, investment can be reduced by more than 35% for similar process sections
• Easy operation and environmentally friendly: Reduces the use of chemicals and filter aids, lowering operational complexity and environmental impact
• Chlor-alkali production: Brine purification in the production of caustic soda, chlorine, and hydrogen
• Advanced brine treatment: Replacement of traditional purification processes to improve brine quality and production efficiency
• Chemical feedstock preparation: Suitable for processes requiring high-quality raw materials, ensuring stable product quality
• Water reuse systems: Enables industrial water recycling, reducing water consumption and supporting sustainable and environmentally friendly production
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