WERKWIJZE VOOR HET TERUGWINNEN VAN ZWARE METALEN UIT EEN BIJ DE BEREIDING VAN TEREFTAALZUUR GEBRUIKTE KATALYSATOR.

摘要

A method for recovering a heavy metal oxidation catalyst used in a liquid-phase oxidation process for producing terephthalic acid from the residue of the reaction mother liquor by stirring the residue together with water in the presence of molecular oxygen and a sulfur compound, subjecting the extracted mixture to a solid-liquid separation to separate the solid impurities, adding the aqueous solution containing the oxidation catalyst to an alkali metal or ammonium carbonate or an aqueous solution of an alkali metal or ammonium carbonate while maintaining the temperature of the system at about 26 DEG C to 70 DEG C, and recovering the heavy metal catalyst as a carbonate precipitate having high purity and good filterability and washability.