| 摘要 |
A process for the preparation of pure, colorless diphenyl terephthalate which comprises heating a dialkyl terephthalate with phenyl acetate in the presence of activated carbon to temperatures above 150 DEG C. in an inert atmosphere, then adding a transesterification catalyst, such as a titanic acid ester, thereto, removing the alkyl acetate formed in the reaction and introducing the hot carbon-containing crude ester into a relatively high boiling aromatic hydrocarbon, such as xylene, also in an inert atmosphere, and crystallizing the product after removing the activated carbon through filtration. Optionally, fresh adsorbent may be added along with the aromatic hydrocarbon prior to crystallization.
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