A kind of preparation technology of β-alanine by bipolar membrane electrodialysis
A bipolar membrane electrodialysis and aminopropionic acid technology, applied in the field of electrochemistry, can solve the problems of low reaction yield, high raw material cost, low yield, etc., and achieve simple process operation, good atom economy, and obvious economic effect Effect
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Embodiment 1
[0025] Add 6kg of liquid caustic soda with a mass fraction of 32% to the hydrolysis kettle, heat it to 95°C, add 1kg of refined aminopropionitrile with a chromatographic purity greater than 99%, dropwise at 100°C, dropwise for 2 hours, and control the vacuum degree - 0.02Mpa; After the dropwise addition, under the vacuum degree, 100°C for 1 hour to obtain the hydrolyzate, the hydrolyzate is passed through the bipolar membrane electrodialysis device, constant voltage electroosmosis, the current density is 40mA / cm 2 , control the pH of the acid chamber to 7.0, and stop until the conductivity of the hydrolyzed solution drops below 600 μS / cm. The acid chamber solution is collected as the GALA solution. The GABA solution is concentrated to 70% at -0.095Mpa at 60°C, and then Cool to 10°C to crystallize and centrifuge to obtain 1.22kg of β-alanine product with a yield of 96.06% and a purity of 99.97%. Among them, the bipolar membrane electrodialysis device includes a dialysis tank, an...
Embodiment 2
[0027] Add 1 kg of liquid caustic soda with a mass fraction of 32% to the hydrolysis kettle, heat it to 100°C, add 1 kg of refined aminopropionitrile with a chromatographic purity greater than 99%, dropwise at 100°C, dropwise for 3 hours, and control the vacuum degree to - 0.02Mpa; after the dropwise addition, under the vacuum degree, 100°C for 1 hour to obtain the hydrolyzate, the hydrolyzate is passed through the bipolar membrane electrodialysis device, and the constant voltage is electroosmotic, and the current density is 20mA / cm 2 , control the pH of the acid chamber to 7.0, and stop until the conductivity of the hydrolyzed solution drops below 600 μS / cm. The acid chamber solution is collected as the GALA solution. The GABA solution is concentrated to 30% at -0.095Mpa, 60°C, and then Cool to 20°C to crystallize and centrifuge to obtain 1.207 kg of β-alanine product with a yield of 95.04% and a purity of 99.94%. Others are the same as in Example 1.
Embodiment 3
[0029] Add 10kg of liquid caustic soda with a mass fraction of 32% to the hydrolysis kettle, heat to 90°C, add 1kg of refined aminopropionitrile with a chromatographic purity greater than 99%, dropwise at 95°C, dropwise for 2 hours, and control the vacuum degree to - 0.02Mpa; After the dropwise addition, under the vacuum degree, keep at 90°C for 1 hour to obtain the hydrolyzate, and pass the hydrolyzate through the bipolar membrane electrodialysis device, constant voltage electroosmosis, and the current density is 80mA / cm 2 , control the pH of the acid chamber to 7.0, and stop until the conductivity of the hydrolyzed solution drops below 600 μS / cm. The acid chamber solution is collected as the GALA solution. The GABA solution is concentrated to 80% at -0.095Mpa, 60°C, and then Cool to -10°C to crystallize and centrifuge to obtain 1.213kg of β-alanine product with a yield of 95.51% and a purity of 99.96%. Others are the same as in Example 1.
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