Bipolar membrane electrodialysis for Direct production of hydrochloric acid and sodium hydroxide from salt (sodium chloride)

Bipolar membrane is a new type of ion exchange composite membrane, which is usually composed of a cation exchange layer, an interface hydrophilic layer (catalytic layer) and an anion exchange layer. It is a true reactive membrane. Under the action of a direct current electric field, the bipolar membrane can dissociate water and obtain hydrogen ions and hydroxide ions on both sides of the membrane. Using this feature, the bipolar membrane electrodialysis system, which combines the bipolar membrane with other anion and cation exchange membranes, can convert the salt in the aqueous solution into the corresponding acid and alkali without introducing new components. The method is called bipolar membrane electrodialysis.

Bipolar membrane electrodialysis technology is a kind of electrodialysis technology, and the core depends on the functionalization of membrane performance.
For high-salt wastewater, bipolar membrane technology can convert corresponding inorganic salts into acids and alkalis. For example, sodium sulfate wastewater can be converted into sulfuric acid and sodium hydroxide; sodium chloride wastewater can be converted into HCl and NaOH.

Amino acid hydrochloride solution is passed into the alkali chamber, and a pure water receiving solution is passed into the acid chamber. After multiple cycles, Cl-95% of the amino acid hydrochloride in the alkali chamber is removed to the acid chamber, where it is combined with H+ Generate hydrochloric acid; in the alkaline compartment, amino acid cations combine with OH- to generate basic amino acids.

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.)

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