Abstract: Preparation of plasticizer dioctyl terephthalate(DOTP) by the waste PET as raw material and tetrabutyl titanate as the catalyst in the aprotic solvent of N-methyl-2-pyrrolidinone is study. Influences of the reaction time，molar ratio，type of solvents and their volume on the yield of alcoholysis products are investigated. The results show that the initial phase is non-homogeneous reaction，solid-liquid mass transfer coefficient is the main factor on the reaction rate，N-methyl-2-pyrrolidone can accelerate the dissolution of polyester film and prompte the alcoholysis reaction into homogeneous process. Under the condition of the reaction time of 2 h，mole ratio (2-EH to PET) of 4，weight ratio (catalyst to PET) of 0.5%，and volume ratio (2-EH to NMP) of 4，the yield of DOTP is 78.10 %.

摘要： 研究了以废聚酯(PET)为原料，钛酸四正丁酯(TBT)为催化剂，在非质子极性溶剂N-甲基-2-吡咯烷酮(NMP)中制备对苯二甲酸二(2-乙基)己酯(DOTP)。探索了反应时间、物料摩尔比、溶剂种类和用量对醇解产物收率的影响。结果表明，反应初始阶段为非均相阶段，固-液间传质系数是影响反应速率的主要因素，加入NMP可以加速PET的溶解，促使醇解反应快速进入均相阶段。在n(2-EH)/ n (PET)=4，m(TBT)/ m (PET)=0.5%，V(2-EH)/ V (NMP)=4的条件下，反应2 h，产物DOTP的收率为78.10%。