Albemarle Corporation

Eldon E Atkinson, Jr

Ronny W Lin

Donald E Balhoff

William J Layman, Jr

This invention relates to a method for obtaining [S,S] ethylenediamine-N,N'-disuccinic acid precipitate from an aqueous solution of the salts of such acid and L-aspartic acid.

Process for obtaining [S,S]-ethylenediamine-n,n'-disuccinic acid from a

This invention relates to a process for selectively producing and recovering [S,S]-ethylenediamine-N,N'-disuccinic acid by the reaction of L-aspartic acid and 1,2-dihaloethane in an aqueous medium, wherein a stoichiometric deficiency of 1,2-dihaloethane is used and wherein the resultant aqueous solution obtained from the reaction is co-fed to water with a mineral acid to preferentially precipitate out [S,S]-ethylenediamine-N,N'-disuccinic acid from the solution.

Process for producing [S,S]-ethylenediamine-N,N'-disuccinic acid

This invention relates to a method for converting calcium salts of [S,S]-ethylenediamine-N,N'-disuccinic acid to an easily filterable precipitate of [S,S]-ethylenediamine-N,N'-disuccinic acid.

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Greenwell Springs, LA, United States of America

Eldon E Atkinson, Jr