| 摘要 |
<p>The treatment of a reaction mixture resulting from the oxidation of cyclohexane comprises (a) distilling to separate the more volatile compounds such as the non-transform cyclohexane, the organic solvent, cyclohexanone, cyclohexanol, cyclohexyl esters, lactones, water and the di-acids formed and the catalyst at the foot of the distillation; (b) addition of water at the foot of the distillation to form an aqueous solution; and (c) crystallisation of the adipic acid from the aqueous solution at the foot of the distillation. Preferably the reaction mixture resulting from direct oxidation of cyclohexane in adipic acid is subjected to a decantation in two liquid phases before the distillation step: a rich cyclohexane phase and a poor phase containing an organic solvent, the diacids formed, the catalyst and part of the other reaction products, the poor phase being subjected to distillation.</p> |
