采用正交实验，考察了原料投料比、 回流反应时间、 催化剂等因素对合成的影响。
The effects of feed composition, reflux reaction time and catalyst concentration on PPTD yield were investigated.
通过考察原料摩尔比、 催化剂用量、加料温度、反应温度和反应时间等因素对收率的影响，得到了最佳反应条件。
The effects of mole ratio of raw material, amount of catalyst, reaction temperature and time on the yield are investigated. The most favorable reaction conditions is obtained.
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