Three-Compartment Bipolar Membrane Electrodialysis Of Salts Of Amino Acids
AssigneeMonsanto Technology LLC
InventorsEduardo Aurelio CASANOVA, Justin Robert STRUBLE, Jian XU
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Abstract
This invention relates to an improved electrodialysis method for preparing an amino acid from a salt of the amino acid utilizing a three-compartment bipolar membrane electrodialysis process wherein an aqueous electrolyte comprising an exogenous acid is added to the acid compartment of a three-compartment bipolar membrane apparatus. The exogenous acid is different than the amino acid and typically has a pKa less than the pKa of the amino acid.
Claims20
A process for recovering an amino acid from an amino acid salt, the process comprising:
- introducing a feed salt stream comprising the amino acid salt into the salt compartment of a two-compartment electrodialysis bipolar membrane cell comprising a salt compartment and a base compartment;
- introducing the product from the salt compartment of the two-compartment electrodialysis bipolar membrane cell into the salt compartment of a three-compartment electrodialysis bipolar membrane cell comprising an acid compartment, a salt compartment, and a base compartment;
- introducing an acid into the acid compartment of the three-compartment electrodialysis bipolar membrane cell;
- wherein the pKa of the acid is at least about 0.5, at least about 1, at least about 2, at least about 3, or at least about 4 pKa units lower than the pKa of the amino acid salt introduced into the salt compartment.
A process for recovering an amino acid from an amino acid salt, the process comprising:
- introducing a process stream comprising the amino acid salt into a salt compartment of a three-compartment bipolar membrane apparatus comprising an acid compartment, a salt compartment, and a base compartment,
- introducing an acid into the acid compartment of the three-compartment bipolar membrane apparatus,
- wherein the pKa of the acid is at least about 0.5, at least about 1, at least about 2, at least about 3, or at least about 4 pKa units lower than the pKa of the amino acid salt introduced into the salt compartment.
A process for recovering iminodiacetic acid from an iminodiacetic acid salt, the process comprising:
- introducing a process stream comprising the iminodiacetic acid salt into a salt compartment of a three-compartment electrodialysis bipolar membrane apparatus comprising an acid compartment, a salt compartment, and a base compartment, and
- introducing an acid into the acid compartment of the three-compartment membrane apparatus.
Dependencies are inferred from the claim text.