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Membrane separation unit system

Bipolar membrane electrodialysis reactor

1.1   2-cell BPED
Theory
Bipolar membrane is a new type of ion exchange composite membrane, which is usually composed of cation exchange layer, interfacial hydrophilic layer and anion exchange layer. Under the action of direct current electric field, the bipolar membrane can be hydrolyzed away, and H+ and OH- can be obtained on both sides of the membrane. Based on this characteristic, bipolar membrane and anion exchange membrane were combined into A two-compartment BPED system (2CBPED-A). The bipolar membrane and cation exchange membrane were combined into a two-compartment BPED system (2CBPED-C).



2CBPED-A Schematic diagram

2CBPED-C Schematic diagram

Application
(1) 2CBPED-A is mainly used to improve the pH of materials and the production of organic alkali;
(2) 2CBPED-C is mainly used to reduce the pH of materials and the production of organic acids;

1.23-cell BPED
Theory:
3-Cell BPED is a bipolar membrane electrodialysis system composed of bipolar membrane and anion exchange membrane. It can convert salt in aqueous solution to corresponding acid and base without introducing new component.


3-Cell BPED Schematic diagram


Application
 It is mainly used to split a salt into its corresponding acid and base. For example, NaCl was divided into NaOH and HCl. Na2SO4 is divided into NaOH and H2SO4.

Product parameters

No.

Items

unit

specifications

1

Diaphragm size

cm×cm

102×46

2

Single pair effective membrane area

m2

0.32

3

Membrane pairs

Pair

150

4

Membrane reactor effective membrane area

m2

48

5

negative plate

Stainless steel

6

Positive plate

Metal oxide coated electrode

7

Pipeline equipment

FRPP

8

Equipment framework

Carbon steel spray paint

Features of membrane reactor design and production:
(1) The special feeding design at both ends enables the membrane reactor to have stable liquid flow and pressure;
(2) Flexible and reliable membrane reactor design makes membrane reactor maintenance, cleaning, disassembly and component replacement easy; Spare parts are easy to store.
(3) The design of integrated polar chamber eliminates the need for separate pipelines and control circuits in membrane reactor polar chamber.
BPED membrane reactor feeding requirements parameters

No.

Items

Unit

Specifications

1

Temperature

ºC

4-38

2

TDS

%

5-10

3

Operation pressure

bar

2-4

5

Turbidity

NTU

<2

6

TOC

mg/L

<60

7

COD

mg/L

<200

8

Multivalent cations

mg/L

<0.5

9

Oil content

mg/L

<1

Note: 2-cell BPED has no clear requirement for TDS content of feed.

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