Dihydroxyethyl terephthalate was synthesized by transesterification of dimethyl terephthalate with ethylene glycol or esterification of purified terephthalic acid with ethylene glycol, and then polycondensation. Pet is divided into fiber grade polyester chips and non fiber grade polyester chips. ① Fiber grade polyester is used to manufacture polyester staple fiber and polyester filament. It is the raw material for polyester fiber enterprises to process fiber and related products. ② Non fiber grade polyester is also used for bottles, films and other purposes. It is widely used in packaging industry, electronic appliances, medical and health care, construction, automobile and other fields. Packaging is not only the largest non fiber application market of polyester, but also the fastest growing field of pet. Dihydroxyethyl terephthalate was synthesized by transesterification of dimethyl terephthalate with ethylene glycol or esterification of purified terephthalic acid with ethylene glycol, and then polycondensation.
