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Separation and recovery of mangenese- and cobalt catalysts from wastewater of PTA unit

S.A.A.Sajadi

The goal of this work is separation and recovery of catalyst residue in wastewater and byproducts of PTA (poly terephetalic acid) unit. Catalyst recovery consists of separation themaximumamount of catalyst and changing the same into valuable compounds. The PTA unit uses mangenese- & cobalt catalyst for oxidation reactions. The byproducts, which contain catalyst, were burned. In the case of metal oxide recovery in the ashes of wastematerials, we could solve the problemof the Petrochamical Company. This new method may help us to recover catalyst from wastewater in PTA unit, after which small amounts of ions may be absorbed in a column filled with special absorbent, in a way that the wastewater outgoing the column has no heavy metal ions. This method is both economical and may solve the environmental problems. In this method and under special pH conditions and time, it is possible to convert mangenese- & cobalt ions to metalhydroxide precipitation, after which the same may be changed into mangenese- & cobalt-acetate. We may use it again as out going catalysts. As an important result of such work, is finding the exact conditions for recovery of this metal ion from wastewater