PREPARATION OF (BETA)-ALANINEDIACETIC ACID OR ITS ALKALI METAL OR AMMONIUM SALTS

摘要

beta -Alaninediacetic acid (Ia) or its alkali metal or ammonium salts (Ib) are prepared by a process in which iminodiacetic acid and acrylic acid (a) for the preparation of Ia, are reacted with one another in a nonbasic aqueous medium and (b) for the preparation of Ib, are reacted with one another in an alkaline aqueous medium or an aqueous medium containing a nitrogen base, or the Ia formed in the nonbasic medium is converted with an alkali metal base, ammonia or an amine into Ib.