METHOD FOR RECOVERING CERIUM COMPOUND

摘要

PURPOSE:To recover a Ce compd. in a high yield by esterifying crude naphthalenecarboxylic acid(NCA) contg. a metal catalyst such as Ce and by washing the esterified product with water, etc., when NCA is produced by liq. phase oxidation of substd. naphthalene. CONSTITUTION:Substd. naphthalene is oxidized with molecular oxygen in the presence of an oxidation catalyst contg. a Ce compd. in a solvent contg. lower aliphatic monocarboxylic acid. The resulting crude NCA contg. the catalyst is separated from the oxidized reaction solution and esterified in the presence of an acid catalyst in alkyl alcohol. The esterified product is washed with water or an aq. acid soln. and the Ce compd. is recovered.