Process for the separation of diethylbenzene in carbon deka-aromatic hydrocarbons

The invention relates to a method for utilizing an extractive distillation process to separate diethyl benzene from C10 arene, comprising: firstly, mixed components of meta-diethyl benzene in C10 arene and other high boiling point components are separated off, with a rectification temperature of between 176 and 182DEG C; then an extractant is added in a meta-diethyl benzene mixture for separating out m-diethyl benzene, wherein, the extractant is dimethyl phthalate, dibutyl phthalate or a mixture thereof; and the extractant and the mixed components of meta-diethyl benzene have a feeding weight ratio of 5 to 20:1, the charging temperature of the extractant is between 120 and 190 DEG C, and the separation temperature is 160 to 190 DEG C; and finally the extractant and the p-diethyl benzene are separated for recovering the extractant through distillation separation; and the method has advantages of simple process, stable operation, low energy consumption, high purity of separated products, good separation effect