PROCESS FOR RECOVERING HEAVY METAL IONS OR HEAVY METAL IONS AND HALOGEN VALUES FROM SOLUTIONS COMPRISING A LOWER ALIPHATIC MONOCARBOXYLIC ACID

摘要

A process for recovering heavy metal ions or heavy metal ions and halogen values from a solution comprising a lower aliphatic monocarboxylic acid, which comprises the steps of: (1) contacting a lower aliphatic carboxylic acid solution containing heavy metal ions or heavy metal ions and halogen values with an anion exchange resin, at least 60% of the ion-exchange groups of said anion exchange resin being in the bromide or chloride state, while the water concentration in the lower aliphatic monocarboxylic acid solution has been adjusted to a level lower than 20% by weight, thereby to adsorb the heavy metal ions or the heavy metal ions and the halogen values on the anion exchange resin; and (2) desorbing the adsorbed heavy metal ions or the adsorbed heavy metal ions and the adsorbed halogen values from the anion exchange resin by elution with an eluent. In the present invention, the halogen values remaining in the lower aliphatic monocarboxylic acid solution which has been contacted with the anion exchange resin can be further recovered by contacting the solution with another anion exchange resin or subjecting the solution to distillation.