METHOD FOR PRODUCING DI(2-ETHYLYHEXYL) TEREPHTHALATE

摘要

Disclosed is a method for producing di(2-ethylhexyl)terephthalate (DOTP), which comprises subjecting terephthalic acid and 2-ethylhexanol to esterification in the presence of a chelate catalyst. The method of the present invention increases the reaction rate, improves the filtration efficiency of the ester product and yields DOTP with low APHA.

主权项

1. A method for producing di(2-ethylhexyl) terephthalate, comprising:
in an inert atmosphere, at a reaction pressure of higher than 1 atmosphere and a reaction temperature of 180-260° C., in the presence of a chelated catalyst of formula (I), subjecting terephthalic acid and 2-ethylhexanol to esterification,
(RO)mT-(O—Y—X)n   (I),wherein in the formula (I), R is hydrogen or C1-C8 linear or branched alkyl, T is titanium or zirconium, Y is C2-C3 alkylene or a divalent phosphate radical, X is a functional group containing oxygen or nitrogen, m is an integer of 1 or 2, and n is an integer of 2 or 3.