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bipolar ion exchange membrane stack

The bipolar ion exchange membrane stack is composed of a bipolar membrane, and the anion membrane and the cation membrane to form acid, alkali, and salt chambers (two chambers or three chambers) in different combinations.
The anions pass through the anion exchange membrane and combine with the H+ ions produced by the bipolar membrane to generate acid. The cations pass through the cation exchange membrane and combine with the OH-ions produced by the bipolar membrane to generate alkali. The process is equivalent to the reverse reaction process of the neutralization reaction. The bipolar membrane electrodialysis is a new type of electrodialysis that introduces bipolar membrane on the basis of electrodialysis, and combines various configurations of cathode and/or cation membrane. Its role is to convert salt solutions into acids and bases.
Under the action of an external reverse DC electric field, the bipolar membrane dissociates H 2 O molecules into H+ and OH- under the action of a catalyst, and migrates into the solution on both sides of the membrane through the anode and cathode layers respectively. The decrease of H+ and OH concentration in the catalytic layer makes the hydrolysis reaction continue to proceed. The bipolar membrane is equivalent to a hydrolysis generator that produces H+ and OH ions.
Bipolar membrane electrodialysis is a new type of electrodialysis formed by introducing a bipolar membrane on the basis of electrodialysis and combining various configurations of the anion membrane and/or the anode membrane. Unlike the concentrated desalination function of conventional electrodialysis, its function is to convert a salt solution into an acid and a base. Under the action of a reverse DC electric field, the H2O molecules in the catalytic layer are dissociated into H+ and OH- under the action of a catalyst, and migrated through the positive and negative layers to the host solution on both sides of the membrane, respectively. The lowering of the H+ and OH- concentrations causes the hydrolysis to proceed continuously. Simply put, a bipolar membrane is equivalent to a hydrolysis generator that produces H+ and OH-ions.
The bipolar membrane, the combination of the anion membrane and the yang membrane constitute a three-chamber of acid, alkali and salt. The anion of the salt passes through the anion membrane and combines with the H+ ion generated by the bipolar membrane to form an acid. On the other hand, the cation passes through the cation exchange membrane and the double The OH-ion generated by the polar membrane combines to form a base, and the process is equivalent to the reverse reaction process of the neutralization reaction.

Characteristics of Electrodialysis Membrane Stack

  • 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.
  • Performance Index(Reference Standard):

    Performance Index

    SYBCM10

    SYABCM60

    SYABM100

    Concentration (kg/h)

    0.05(NaCl)

    5(NaCl)

    10(NH4Cl)

    Decomposition (kg/h)

    0.05(NaCl)

    5(NaCl)

    10(NH4Cl)

    Power (kw)

    0.18--0.2

    35--40

    35--40

    Salt Passage(%)

    <4%

    <4%

    <4%

    Testing Date(Reference Standard):

    Testing Date

    SYBCM10

    SYABCM60

    SYABM100

    Water intake(m3/h)

    0.005

    0.5

    1

    Test medium

    15% NaCl

    15% NaCl

    15% NaCl

    Concentrated concentration

    8% NaOH

    8% NaOH

    8% NaOH

    Desalination concentration

    8% NaCl

    8% NaCl

    8% NaCl

    Design Parameter(Reference Standard):

    Design Parameter

    SYBCM10

    SYABCM60

    SYABM100

    Operating temperature

    5-40 ℃

    5-40 ℃

    5-40 ℃

    Optimum operating temperature

    25-35 ℃

    25-35 ℃

    20-43 ℃

    Acid and alkali concentration

    0.5-3%

    0.5-1%

    0.5-3%

    Working Life

    2-4 years

    2-4 years

    2-4 years

    Size

    140*120*340mm

    460*260*880mm

    460*280*880mm

    Number of sets

    6--10 pairs

    60 pairs

    100 pairs

    areas

    0.09-0.15 m2

    15 m2

    25 m2

    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) water temperature : 5-40 degrees Celsius
    2) oxygen consumption: < 20mg/L , It cannot contain aromatic hydrocarbons
    3) SS: < 1mg/L
    4) Fe: < 0.3mg/L
    5) Mn: < 0.1mg/L
    6) SDI: < 3
    7) Mg, Ca < 1mg/L
    8) turbidity < 1NTU
    9) SiO2 < 1mg/L

    Performance Introduction of SYABCM200

    200 pieces of bipolar ion exchange membrane,anion-exchange membrane and cation-exchange membrane for each.
    The effective area of each membrane is 50 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
    30
    1.5
    Na2So4
    Na2SO4+H2O→H2SO4+NaOH
    36.4
    1.2
    LiCl
    LiCl+H2O→LiOH+HCl
    21.8
    2.1
    Li2SO4
    Li2SO4+H2O→H2SO4+LiOH
    28.2
    1.6
    NaNO3
    NaNO3+H2O→HNO3+NaOH
    43.6
    1.1
    Usually the acid-base equivalent concentration is 1N, and the acid-base concentration can be further increased by changing the operating conditions.





Our Mission

Continuously provide the Ion-Exchange Membrane with lower energy consumption and excellent performance for Green Energy and Chlor-Alkali Industries
Continuously improve the technology of environmentally friendly

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 Dongfeng Street, Weifang Shandong China

 (0086) 536-821-6345