Twin Bed and Mixed Bed Demineralizer
Mit Water designs and manufactures twin-bed and mixed-bed demineralizers for production of high-purity water through ion exchange. These systems remove dissolved ionic contaminants from water, producing deionised water for applications requiring very low conductivity.
Working Principle
A twin-bed demineralizer consists of two separate pressure vessels in series: a cation exchanger containing strong acid cation (SAC) resin in hydrogen form, followed by an anion exchanger containing strong base anion (SBA) resin in hydroxide form. Cations are exchanged for H+ and anions for OH-, combining to form water. When resins become exhausted, they are regenerated with acid and caustic respectively. The system achieves high water recovery rates through ion exchange cyclic regeneration.
System Configuration
Our demineralizers include FRP or rubber-lined pressure vessels, SAC and SBA resins, regeneration chemical storage and dosing systems, conductivity monitoring, and a PLC control panel. Options include a degasifier for CO2 removal, mixed-bed polisher for final polishing, and duplex configuration for continuous operation during regeneration.
Twin-bed and mixed-bed demineralizers serve industries requiring deionised water:
- Power plant boiler feed water make-up
- Chemical and petrochemical process water
- Electronics and semiconductor rinse water
- Pharmaceutical and cosmetics ingredient water
- Metal finishing and surface treatment rinse water
- Laboratory and research facility water systems
- Battery manufacturing process water
Technical Parameters
| Flow Rate | 1 to 100 m3/h per train |
| Product Water Quality | Conductivity below 0.2 uS/cm (twin bed) |
| Regenerants | HCl or H2SO4 (cation); NaOH (anion) |
| Vessel Material | FRP, rubber-lined carbon steel, or SS316L |
| Water Recovery | 95% to 98% |
| Exchange Capacity | 25 to 50 eq/m3 resin (resin dependent) |
| Configuration | Simplex, duplex, or with mixed-bed polisher |
| Control System | PLC with conductivity-triggered regeneration |