| 摘要 |
A method for the preparation of ethylcyclohexane from an initial mixture of ethylbenzene and meta-xylene comprising effecting partial catalytic hydrogenation of the initial mixture to obtain a conversion of ethylbenzene to ethylcyclohexane between 50 to 99% and a conversion of xylene to between 10 and 50%, separating by distillation ethylcyclohexane and non-hydrogenated ethylbenzene in two steps from the partially hydrogenated mixture, the first of the steps comprising separating from the hydrogenate non-hydrogenated xylene and the second of the steps comprising separating a fraction containing ethylcyclohexane and non-hydrogenated ethylbenzene from the remainder of the hydrogenate, and then effecting total catalytic hydrogenation of the fraction containing ethylcyclohexane and non-hydrogenated ethylbenzene. According to a variant, after the partial catalytic hydrogenation non-hydrogenated xylene contained in the hydrogenate, is separated by distillation and then total catalytic hydrogenation of the rest of the hydrogenate is effected and, ethylcylohexane is separated. |
