PET feem ntau siv ob txoj kev sib txuas hauv qab no: ncaj qha esterification ntawm terephthalic acid (PTA) nrog ethylene glycol (EG) (PTA) thiab transesterification ntawm dimethyl terephthalate (DMT) nrog ethylene glycol. Txoj Cai (DMT txujci). Txoj kev qhia ncaj ncaj esterification yog qhov qhia tau ncaj qha ntawm PTA thiab EG rau hauv oligomer ntawm terephthalic acid thiab ethylene glycol (bishydroxyethyl terephthalate BHET), tom qab ntawd polycondensation. Cov txheej txheem transesterification yog ua ntej hloov lub terephthalate rau dimethyl terephthalate, thiab tom qab ntawd los tsim cov polyester los ntawm transesterification. Piv nrog rau txheej txheem transesterification, txoj kev ncaj esterification muaj qhov zoo ntawm cov txheej txheem luv, kev noj qis thiab kev nyab xeeb zoo. Esterification ncaj qha tau ua cov txheej txheem tseem ceeb thiab cov kev nyiam siv tshuab rau polyester txij thaum 1980s.
Cov ntaub ntawv tseem ceeb rau cov hluavtaws PET yog: terephthalic acid (TPA), dimethyl terephthalate (DMT), thiab ethylene glycol (EG). Tus catalyst no mas yog hlau sib txuas xws li ruthenium catalyst, ruthenium catalyst, lossis titanium catalyst. Ntawm lawv, ruthenium catalyst muaj cov kev ua haujlwm siab tshaj plaws thiab sab qis sab, thiab cov tshuaj tiv thaiv thermal cuam tshuam txog cov polyester yog qhov tsawg thiab tus nqi tsawg, thiab cov khoom lag luam muaj qhov zoo, yog li nws yog qhov siv dav. Feem ntau siv lanthanide catalysts yog ethylene glycol oxime, cerium acetate thiab antimony trioxide. Txawm li cas los xij, cov tshuaj lom ntawm bismuth compound tuaj yeem cuam tshuam loj rau tib neeg kev noj qab haus huv thiab ib puag ncig. Xyoo tsis ntev los no, qee lub tebchaws hauv ntiaj teb tau tso qee yam tshiab uas yuav tsum tau siv rau hauv ntiaj teb cov cua nab. Piv txwv, EU xav kom tsawg dua 0.01 mg / kg ntawm 锑 ib kilogram ntawm cov khoom ntim xa mus rau cov zaub mov.