Process for preparing calcium pyruvate and its hydrates

摘要

Preparation of very pure calcium pyruvate (I) or its hydrate (IA) by reacting an aqueous solution of pyruvic acid (II) with an inorganic calcium compound (III) at pH 2-7, preferably 2.5-4. A 10% aqueous (II) solution is reacted with (III), optionally in the presence of a stabiliser or complex forming agent. The resultant solution is mixed with an organic diluent at 0-30 degrees C. The resultant precipitate of (I) or (IA) is isolated from the solution.