Ammonia → (+-)-Aspartic Acid

Participants

Reaction Steps

The mother liquor and the washing water from Example 11 are combined. Then water and ammonia are added until 2780 ml of a 20% strength aqueous solution with a pH of 10.5 are obtained. This solution is reacted as described in Example 9 and subsequently concentrated as in Example 10. 1453 ml of a bottom product remain. D,L-aspartic acid is then precipitated as described in Example 11 by adding 323 g (2.78 mol) of maleic acid. Drying results in 382 g (2.87 mol) of D,L-aspartic acid, corresponding to a yield of 95.7% based on the amount of maleic acid added in Example 11.

Provenance & Evidence