The main raw materials are terephthalic acid and ethylene glycol monomers, generating BHET by direct esterification firstly, and then making PET by polycondensation reaction. PET is mainly used in fields such as fibers, packaging materials, electronics, and automobiles.

Two different kinds of process: Batch process and continuous process. Batch process mainly includes single-reactor system, double-reactor system, and three-reactor system, etc.; Continuous process mainly includes four-reactor process and five-reactor process. For some varieties, special functional reactor units need to be added.