The main raw materials are terephthalic acid and 1, 3-propylene glycol monomer, generating BHPT by direct esterification firstly, and then making PTT polycondensation reaction. Relatively speaking, PTT has the advantages of nylon and acrylic fiber, and has good elasticity, PTT is mainly used in fields such as fibers.

Two different kinds of process: Batch process and continuous process. Batch process mainly includes single-reactor system, double-reactor system, etc.; Continuous process mainly adopts the four-reactor process, which pays special attention to the control of end-base side reactions.