PRODUCTION OF CARBOXYLIC ACID AND AMMONIA FROM AMMONIUM CARBOXYLATE

摘要

PURPOSE:To simultaneously produce a carboxylic acid and ammonia at a low cost without adding organic solvent and generating waste acid, by decomposing an ammonium carboxylate using ammonium bisulfate as a deammoniation agent. CONSTITUTION:An ammonium carboxylate having an acid dissociation index of 3.5-5.5 is reacted in an aqueous solution at 0-50 deg.C using ammonium bisulfate as a deammoniation agent to obtain a carboxylic acid. The ammonium bisulfate used as a deammoniation agent is recovered as ammonium sulfate. The recovered ammonium sulfate is crystallized in an aqueous phase or by concentration and the crystallized compound is thermally decomposed into ammonium bisulfate and ammonia. The ammonium bisulfate is recycled to the reaction system. The molar ratio of the ammonium carboxylate to ammonium bisulfate is 1.0-1.2. The obtained carboxylic acid is useful as a raw material for various higher esters and polymers.