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PET (Poly ethylene terephthalate) PBT (Poly butylene terephthalate)      .   PET BD (1,4-butanediol)    BHBT (Bishydroxybutylterephthalate)    BHBT     PBT      .        PET      PBT        .      zinc acetate ,           .    (EG)       EG   THF    .   EG           .       BD/PET  4,  220 oC ,  EG  91% .       PBT     .

Production of PBT(polybutylene terephthalate) Oligomer from Recycled PET(polyethylene terephthalate)