Principle Introduction
The bipolar membrane is a layered membrane with a cation exchange layer on one side and an anion exchange layer on the other side. The junction between the cation exchange layer and the anion exchange layer is a water layer. It is split into H+ and OH- and passes through the cation exchange layer and the anion exchange layer respectively. Bipolar membranes are the key components of bipolar membrane electrodialysers (BPEDs). BPED is an electrodialysis device that uses bipolar membranes to dissociate water and the selective permeability of anion and cation exchange membranes to convert salts into acids and bases. The principle is shown as follow:
Under the action of the DC electric field, the ions in the solution migrate in a direction, the cations in the salt chamber pass through the cationic membrane, are blocked by the cathode layer of the bipolar membrane and stay in the alkali chamber, and at the same time, the bipolar membrane dissociates the OH- after passing through the cathode layer of the bipolar membrane, it is blocked by the anode membrane and stays in the alkali chamber, so that alkali is produced in the alkali chamber; the anions in the salt chamber pass through the cathode membrane and are blocked by the anode layer of the bipolar membrane and stay In the acid chamber, at the same time, the H+ generated by the dissociated water of the bipolar membrane passes through the anode layer of the bipolar membrane and is blocked by the cathode membrane and stays in the acid chamber, so that acid is generated in the acid chamber, since the ions of the salt chamber solution migrate outward, the desalination effect is achieved over time.
Item |
No. |
Name |
Type |
Material |
Tanks |
1 |
water supply tank |
V=10m³ |
PE |
2 |
water production tank |
V=10m³ |
PE |
|
3 |
water tank for polar water |
|
PE |
|
4 |
water tank for cleaning |
3m³ |
PE |
|
Membrane stack |
5 |
Membrane stack |
ABCM-8040/200 |
|
Pump |
6 |
Circulating pump |
Q=20m³/h，H=20m， |
FRPP |
7 |
Efflux pump |
Q=10m³/h，H=20m |
FRPP |
|
8 |
Circulating pump for polar water |
Q=10m³/h，H=20m， |
FRPP |
|
9 |
Pump for cleaning |
Q=50m³/h，H=20m， |
FRPP |
|
Heat Exchanger |
10 |
Material heat exchanger |
A=5m2 |
TI |
11 |
Polar water heat exchanger |
A=5m2 |
TI |
|
Filter |
12 |
Security Overthinker |
50m³/h，1um |
|
Security Overthinker |
20m³/h，1um |
|
||
Security Overthinker |
8m³/h，1um |
|
||
meter |
13 |
conductivity meter 1 |
0~500ms/cm，4~20mA |
|
14 |
conductivity meter 2 |
0~200ms/cm，4~20mA |
|
|
15 |
Electromagnetic Flowmeter |
DN40 |
|
|
Turbine flowmeter |
DN40 |
|
||
16 |
Pressure Transmitters |
0~0.2MPa |
|
|
17 |
Temperature Transmitter |
0~50℃ |
|
|
18 |
Pressure gauge |
0~0.2MPa |
|
|
19 |
Level gauge |
0~3m |
|
|
20 |
PH meter |
|
|
|
21 |
Pneumatic valves |
DN100、DN65 |
|
|
Pipe and valve |
22 |
Pipe and valve |
Pipe fittings, pneumatic valves, manual valves |
|
Exhaust system |
23 |
Exhaust system |
Exhaust pump, instrument, pipe valve |
|
electric |
24 |
High frequency power supply |
|
|
25 |
PLC |
Including control system |
|
Characteristics of Bipolar Electrodialyzer BPED
- Energy saving and environmental protection, a new generation of acid-base technology;
- splitting water into H+ and OH- at low voltage;
- The acid and alkali are formed from inorganic salts and organic acid salts in a single process, and the process is simple and clean;
- The concentration of acid and alkali produced is controllable and adjustable;
- no redox reaction occurs except for the electrodes at both ends, and no by-products are produced;
- Each chamber does not require electrodes, and the amount of gas generated is small. The investment cost and operating cost account for only 40 to 50% of the electrolysis method.
Applications Area:
1, Preparation of acid and bases from inorganic salts (such as sodium sulfate, sodium chloride, lithium chloride, etc.)2, Production of organic acids (such as gluconic acid, lactic acid, malic acid, succinic acid, etc.)
3, Production of organic bases (such as ornithine, lysine, arginine, histidine, etc.)
Inlet water requirement of Bipolar ion exchange membrane electrodialysis:
1) Suspended matter ≤1mg/L, needs to be filtered through a membrane with an absolute pore size of less than 0.05 microns;2) Iron ≤0.2mg/L;
3) Si ≤10mg/L;
4) Oily and other poorly water-soluble organic matter ≤0.1mg/L;
5) Pollution Index (SDI) <3
6) Water temperature: 15~40℃, Optimal operating temperature: 25-35℃;
7) Does not contain post-flocculation substances, that is, substances that will accumulate flocculation or fouling in the membrane module;
8) Total concentration of polyvalent metal ions(including but not limited to calcium magnesium zinc iron, etc.) ≤1mg/L
9) Free residual chlorine less than 0.1mg/L, other oxidizing substances can be converted into free residual chlorine
Performance Introduction of SYABCM8040-50
200 pieces of bipolar ion exchange membrane,anion-exchange membrane and cation-exchange membrane for each.
The effective area of each membrane is 12.5 m2.
Current Density: 500A/m2
Under standard operating conditions, the conversion efficiency of the membrane stack is as follows(Other salts can be calculated according to the corresponding equivalent molar mass):
Name |
Reaction Formula |
Processing Capacity |
Power Consumption |
NaCl |
H2O+NaCl→HCl+NaOH |
7.5 |
1.5 |
Na2So4 |
Na2SO4+H2O→H2SO4+NaOH |
9.1 |
1.2 |
LiCl |
LiCl+H2O→LiOH+HCl |
5.45 |
2.1 |
Li2SO4 |
Li2SO4+H2O→H2SO4+LiOH |
7.1 |
1.6 |
NaNO3 |
NaNO3+H2O→HNO3+NaOH |
10.9 |
1.1 |
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