Bipolar Membrane Electrodialyzer Forseparation and Purification of Methionine and Tianmen Partic Acid, Amino Acid Desalination and Soy Sauce Desalination

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 electrodialyser (BPED). BPED is an electrodialysis device that uses bipolar membranes and the selective permeability of anion and cation exchange membranes to convert salts into acids and bases.
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.
The electrodialyser is composed of bipolar membrane, AEM, CEM, Separator and related accessories.

Bipolar membrane electrodialysis is an electrodialysis formed by combining bipolar membranes and unipolar membranes in different ways. Bipolar membrane electrodialysis combines the dissociation of salts of ordinary electrodialysis with the dissociation of H2O molecules in bipolar membranes. In this way, the corresponding salt ions in the solution combine with the hydrogen ions and hydroxide ions generated by the hydrolysis of the bipolar membrane to convert into corresponding acids and bases. Bipolar membrane dissociation water has no gas or by-products, which will reduce the voltage and maximize the use of energy. In the same bipolar membrane electrodialysis membrane stack, inorganic and organic salts can be converted into corresponding acids and alkalis. Bipolar membrane electrodialysis is mainly used for the regeneration and reuse of acid and alkali in salt preparation; clean production of organic acids and alkalis.
Characteristics of Electrodialysis Membrane Stack

Applications Area:
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.
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):
Usually the acid-base equivalent concentration is 1N, and the acid-base concentration can be further increased by changing the operating conditions.
 

Applications Cases:

Ø  Treatment and recycling of saline wastewater

Ø  Direct production of hydrochloric acid and sodium hydroxide from table salt (sodium chloride) Direct production of vitamin C from sodium salt of vitamin C

Ø  Direct production of tartaric acid from sodium tartrate

Ø  Direct production of lactic acid from sodium lactate

Ø  Direct production of gluconic acid from sodium gluconate

Ø  Direct production of methanesulfonic acid from sodium methanesulfonate

Ø  Direct separation of amino acids from fermentation broth

Ø  Recovery of acetic acid from sodium acetate waste water