Procédé de récupération de catalyseurs.

摘要

Vanadium and copper in cationic form are recovered from aqueous solutions containing them and ferric ions by bringing the solution, of pH at most 1.8, into contact with two cation exchange resin beds, being the hydrogen form of an oxidation-resistant water-insoluble polymerizate, in succession, the first bed removing ferric ions and the second bed removing copper and vanadium ions from the solution. The first bed may be regenerated by elution with the effluent, rich in hydrogen ions, from the second bed, or with strong mineral acid; the copper and vanadium ions are eluted from the second bed with a strong mineral acid, e.g. HNO3. The aqueous solution treated results from the crystallization of adipic acid manufactured by nitric acid oxidation of cyclohexanol and cyclohexanone in the presence of copper and vanadium mixed catalyst; the pH should not be less than -0.3. The resins are sulphonated polystyrenes cross-linked with divinyl benzene. The solution to be treated preferably contains by weight 0.05 to 1.5% V, calculated as ammonium meta-vanadate but which in the process is VO2+; 0.16 to 5.0 or more per cent Cu, and up to 0.2% Fe. The temperature is preferably 20 DEG to 90 DEG C. Two pairs of resin columns may be used, one pair being regenerated while the other is in use.ALSO:Vanadium and copper in cationic form are recovered from aqueous solutions containing them and ferric ions by bringing the solution, of pH at most 1,8, into contact with two cation exchange resin beds, being the hydrogen form of an oxidation-resistant water-insoluble polymerizate, in succession, the first bed removing ferric ions and the second bed removing copper and vanadium ions from the solution. The first bed may be regenerated by elution with the effluent, rich in hydrogen ions, from the second bed, or with strong mineral acid; the copper and vanadium ions are eluted from the second bed with a strong mineral acid, e.g. HNO3. The resins are sulphonated polystyrenes cross-linked with divinyl benzene. The solution to be treated preferably contains by weight 0,05-1,5% V, calculated as ammonium metavanadate but which in the process is VO+2; 0,16-5,0 or more per cent Cu, and up to 0,2% Fe. The temperature is preferably 20-90 DEG C. Two pairs of resin columns may be used, one pair being regenerated while the other is in use.