Refining piperonyl butoxide by short-path distillation technology

Purification of piperonyl butoxide(PB) by short-path distillation was studied experimentally. The effects of operating parameters such as feed flow rate, feed temperature and evaporation temperature on separation efficiency of PB were discussed. Suitable operating parameters obtained from the experiment were: feed temperature 70～92℃, feed flow rate 50～70 mL/h, distillation temperature(Ⅰ) 90～94℃, distillation temperature(Ⅱ) 98～107℃, rotor revolutions per minute 130～150 r/min and operating pressure 0.1 Pa. Through the above-mentioned method, a high purity product of 96% PB could be obtained, with total obtaining ratio of more than 70%.