Method for separating N-ethylpiperazine-ethanolamine azeotropic mixture by azeotropic rectifying intermittent operation

The present invention discloses a batch azeotropic distillation separation operation N- ethylpiperazine - Method ethanolamine azeotrope. The method using distillation apparatus, a batch operation, cyclohexane azeotropic agent was added with the feedstock was heated kettle at atmospheric pressure, an azeotropic distillation column overhead temperature at 79 ℃ -81 ℃, the condensate entering the phase separator phase, cyclohexane was refluxed to an azeotropic distillation column, the produced amine; an azeotropic distillation column overhead temperature at 82-154 deg.] C, at a reflux ratio of transition 3:1-6:1 recovery fraction, the transition fraction is recycled material used as the next batch distillation; an azeotropic distillation column overhead temperature at 155 ℃ -157 ℃, taken out at a reflux ratio 1:2-1:1 N- ethylpiperazine. Advantage of the present invention is that the azeotropic agent ethanolamine and form a heterogeneous minimum boiling point azeotrope, damage N- ethylpiperazine - ethanolamine azeotropic system, the separated N- ethylpiperazine purity of 99%.