Refining P-methyl-acetophenone by Vacuum Batch Distillation

The experimental study for purification of p-methyl-acetophenone by vacuum batch distillation was carried out.The optimal operation condition for purification of p-methyl-acetophenone was that the pressure of operation system was less than 5.0 kPa and temperature of the reboiler was less than 145 ℃ with variable reflux ratio.The concentration of the product was up to 99.5%.Meanwhile,the composition of m-methyl-acetophenone was less than 0.5%.