Amerisource has the largest PBT production device in China. And Amerisource has developed the domestic technology producing PBT with esterization method under the cooperation of Yangzhou Pulit . At the same time we aim to build the largest high-end PBT production base in China by strict control of product process and continuously improved quality management. The devices of PBT synthetic resins invented by Amerisource include mixed device of slurry, esterization reactor, pre-shrinking reactor and final shrinkage reactor which are connected in turn. The mixed device of the slumy is used to mix PTA and BDO The mixed slurry first reacts in the esterization reactor, then perform a pre-shrinking reaction in the pre-shnnking reactor at last, the final reduction reaction was performed in the final shrinkage reactor. According to Amerisource process invention . .._ "a device and method for producing PBT synthetic resin", the reactors have high react efficiency, good controllability, low energy consumption, and high degree of automation, which resulted in a continuous production and satisfied production efficient.