PROCEDURES FOR THE RECOVERY OF COBALT CARBON ACYL-ALPHA-AMINOSE ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID ACID

摘要

PCT No. PCT/EP97/06707 Sec. 371 Date Jul. 28, 1999 Sec. 102(e) Date Jul. 28, 1999 PCT Filed Dec. 1, 1997 PCT Pub. No. WO98/24547 PCT Pub. Date Jun. 11, 1998The present invention relates to a process for recovering cobalt carbonyl catalysts used in the preparation of N-acyl-alpha-amino acid derivatives by amidocarbonylation comprising the process steps: adding aqueous hydrogen peroxide solution to the reaction solution present after the preparation of the N-acyl- alpha -amino acid derivative, then separating the aqueous phase containing water-soluble cobalt(II) salt from the nonaqueous product-containing phase, subsequently adding an alkali metal salt of the N-acyl-alpha-amino acid derivative to the aqueous phase from the previous process step, then separating off the precipitated cobalt salt of the N-acyl-alpha-amino acid derivative, and finally converting the resulting cobalt salt of the N-acyl-alpha-amino acid derivative into the cobalt carbonyl catalyst in the presence of a mixture of carbon monoxide and hydrogen.