New catalysts combined with an organic or inorganic lithium salt (lithium acetate or lithiumchloride) and a conventional catalyst for the transesterification of dimethyl terephthalate withethylene glycol have been stu...New catalysts combined with an organic or inorganic lithium salt (lithium acetate or lithiumchloride) and a conventional catalyst for the transesterification of dimethyl terephthalate withethylene glycol have been studied. Reaction mechanism in presence of lithium-base catalyst hasbeen proposed. A synergistic action of two classes of catalysts creates the speed-up of initial re-action particularly in presence of lithium acetate. The presence of lithium base catalyst can re-duce diethylene glycol content and raise the melting point of final PET product, but almostuneffect PET molecular weight distribution.展开更多
文摘New catalysts combined with an organic or inorganic lithium salt (lithium acetate or lithiumchloride) and a conventional catalyst for the transesterification of dimethyl terephthalate withethylene glycol have been studied. Reaction mechanism in presence of lithium-base catalyst hasbeen proposed. A synergistic action of two classes of catalysts creates the speed-up of initial re-action particularly in presence of lithium acetate. The presence of lithium base catalyst can re-duce diethylene glycol content and raise the melting point of final PET product, but almostuneffect PET molecular weight distribution.
