Process For Preparing A Crystalline L-Mgda Tri-Alkali Metal Salt
Patent No. EP2705022 (titled "Process For Preparing A Crystalline L-Mgda Tri-Alkali Metal Salt") was filed by Basf on Apr 25, 2012. The application was issued on Apr 28, 2021.
Patent Summary
A process for preparing crystalline L-MGDA trisodium salt involves crystallization from an aqueous solution. The solution is produced by reacting L-α-alanine with formaldehyde and hydrocyanic acid via Strecker synthesis to yield L-α-alanine-N,N-diacetonitrile (L-ADAN). L-ADAN is subsequently subjected to alkaline saponification to produce the L-MGDA trisodium salt. To prevent racemization of the L-enantiomer, the temperature during alkaline saponification must not exceed 150°C. This method provides a technically simple alternative to the complex mass crystallization of racemic mixtures, yielding a crystalline powder that is less hygroscopic and more storage-stable than amorphous solids. The crystallization may be performed via discontinuous or continuous evaporative processes.
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Date
Description
EP2705022
- Application Number
- EP12716431A
- Filing Date
- Apr 25, 2012
- Status
- Patent Maintained As Amended
- Mar 26, 2021
- Publication Date
- Apr 28, 2021
- External Links
- Slate, Register , Google Patents