RECOVERY OF METAL CATALYST RESIDUES FROM THEREPHTHALIC ACID PRODUCTION

摘要

In a process for oxidising p-xylene to terephthalic acid in solution in acetic acid using a catalyst which comprises cobalt and manganese, terephthalic acid is separated from a mother liquor and the catalyst and other useful products separated from at least part of the mother liquor by distilling acetic acid from it, dissolving the residue in an alkali, removing precipitated cobalt and mangenese compounds precipitating organic acids by adding acid to the solution and separating the monobasic from the polybasic acids of the precipitate by solvent extraction.