Salts, crystals, complexes, and derivatives of threonine diacetic acid, a process to prepare threonine diacetic acid, and the use thereof

摘要

The present invention relates to new salts, complexes, crystals, solutions, dispersions, and slurries of threonine-N,N-diacetic acid or derivatives thereof, to formulations containing those, to processes to prepare those, and to the use thereof.

主权项

1. A process to prepare threonine-N,N-diacetic acid or a salt thereof comprising two or more steps wherein in a first step threonine, a sodium or potassium salt thereof or a mixture thereof is reacted with formaldehyde and hydrogen cyanide, at a pH equal to or below 7 to form a nitrile compound, and in a second step the nitrile compound formed in the first step is hydrolyzed by the addition of an acid or base.