Specialty — Diffusion Dialysis
SP-DDC Series — Alkali Recovery Diffusion Dialysis Membranes
Cation exchange membranes for caustic recovery from spent alkaline liquors
Product description
The alkali recovery diffusion dialysis membrane is a high-efficiency membrane material specifically designed for separating alkali from salts and organic compounds. By selectively recovering valuable components from spent alkaline solutions, the separated alkali can be reused in production — enabling resource recycling and waste reduction while improving economic and environmental performance.
Working principle: the membrane operates on selective ion permeability. Without external pressure, hydroxide ions diffuse from the waste solution side to the recovery side driven by a concentration gradient, while salts and organic impurities are effectively retained. The process features low energy consumption and stable operation, suitable for continuous industrial applications.
Specifications
| Analysis Item | Unit | Cation Membrane SV-SP-DDC2 |
|---|---|---|
| Ion Exchange Capacity | mmol·g⁻¹ | 0.30–0.50 |
| Thickness (wet) | μm | 140–170 |
| Water Content (25 °C) | wt % | 50–70 |
| Dialysis Coefficient | 10⁻⁷ m·s⁻¹ | ≥2 |
| Separation Factor | — | ≥15 |
| Operating Temperature | °C | 15–40 |
| Application | — | Sodium hydroxide / Potassium hydroxide / Lithium hydroxide systems |
Performance figures are nominal values obtained under the standard test conditions stated with each table. Actual performance varies with feedwater chemistry, pretreatment, flux, recovery, temperature, pressure and operating practice. Individual element flow may vary from the nominal value. Specifications are subject to change without notice — request the current datasheet before specifying.
Typical applications
- Waste alkali recovery from industrial alkaline waste streams
- Alumina industry — recycling and reuse of alkaline solutions
- Viscose fibre industry — purification and reuse of alkali solutions
- Tungsten metallurgy — separation and recovery of alkaline solutions
- Aluminium foil etching — recovery of alkali from etching solutions
- Pharmaceutical and agrochemical — treatment and reuse of alkaline process liquids
- Polysilicon industry — recovery of alkali from cleaning and processing solutions
- Chemical industry — separation and resource recovery of alkaline waste liquids
Related series
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