Monopolar Membranes
Monopolar membranes
The main components of electrodialysis modules are polymeric ion-exchange membranes. The Ion exchange membranes are nanoporous materials which functional properties are determined by the properties of the thin surface layer with a thickness from several nanometers to micrometers.
At present JSC "Schekoniazot" launched production of high-quality membranes on the classical technology on domestic resins. The company is the only Russian producer of heterogeneous monopolar ion-exchange membranes marks MK-40, MK-40L, MA-41 and MA-41P. Membranes suitable for use in electrodialysers and electrodialysis plants.
Membranes of marks MK-40, MA-41:
• reinforced by nylon polyamide and polyester:
• water-insoluble, also in weak inorganic acids and most organic solvents.
Membranes brands MK-40L:
• reinforced mylar cloth
• water-insoluble, also in weak inorganic acids and most organic solvents and strong mineral acid up to pH 0,5.
Warranty period of 2-5 years depending on the operating environment.
Monopolar membranes.
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Name of indicator |
Norm for model |
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MK-40 |
MK-40L |
MA-41P |
MA-41 |
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Appearance
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Opaque sheets without external objects with diameters greater than 2 mm., and through holes.
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Opaque sheets with no punctures, no cracks with a through violation of ion exchange material larger than 2 mm., and no impurities, projecting above the surface of membranes.
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Size: Length, mm., not less than |
1420 450 0.3-0.5
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1420 450 0.3-0.5 |
1420 450 0.3-0.5
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1420 450 0.3-0.5
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Tensile strength, Mpa, not less than |
11.9 |
9 |
10 |
11.0 |
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Resizing on swelling, % Along |
8 ±2 30 ±5 |
6±2 28±7 |
7±2 28±7 |
6±3 - |
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Surface electrical resistivity: Ohms per cm², max |
10.0 |
13.0 |
8.0 |
11.0 |
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Transfer number, share, not less than |
0.8 |
0.8 |
0.8 |
0.94 |
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Ionic group |
SO3H |
SO3H |
N(CH3) |
N(CH3) |
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Ionic form - counter ion |
Na+ |
Na+ |
CL- |
CL- |
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Inert binder |
polyethylene |
polyethylene |
polyethylene |
polyethylene |
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Reinforcing material |
polyamide |
polyester |
polyamide |
polyamide |
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The size of the standard membrane sheet is 1420*450 mm. Permitted, with agreement with the customer, manufacturing of membranes of other sizes, but not more than 1420*900 mm without changing their electrochemical and physicochemical properties. Operating temperature range of membranes - 10-50 degrees of Celsius.
Membranes are used in installations for different areas:
• demineralization of whey;
• purification of sugar syrups;
• desalting and deionization of water;
• wastewater treatment emitting valuable items;
• deep purification of biological and medical products;
• decontamination of radioactive wastewater;
• concentration of wastewater containing valuable components;
• preparation of water to heat.