| 摘要 |
<p>Copper and vanadium catalysts and nitric acid are recovered from the mother liquors of a process for the production of adipic acid (see Division C2) by evaporating nitric acid from the liquors until the residue diluted with 0.75 to 4 times its weight of water has a pH of 1.2 to 2.2, maintaining the diluted residue at 30 DEG to 100 DEG C., but above the crystallization point of the dibasic acids, separating the organo-vanadium compound precipitated and after removing the precipitate, stripping the copper using a cation-exchange resin. The vanadium is dissolved in some of the nitric acid recovered for re-use as a catalyst, and the copper is recovered from the ion-exchange likewise.ALSO:<PICT:0963359/C1/1> The copper and vanadium catalysts and nitric acid recovered (see Division C1) from the waste liquors from the nitric acid oxidation of mixtures of cyclohexanol and cyclohexanone to adipic acid, with glutanic and succinic acids as by-products, are utilized in the oxidation of further amounts of starting materials.</p> |
