The main raw materials are terephthalic acid and butanediol monomer, esterified to generate BHBT, and then making PBT by polycondensation reaction. PBT is mainly used in fields such as engineering plastics, fiber, electronic and electrical fields after modification.

Two different kinds of process: Batch process and continuous process. Batch process mainly includes single-reactor system, double-reactor system, etc.; Continuous process mainly includes three- reactor process and the four- reactor process, Generally, Small amounts of THF by-products are produced at the same time.