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The kinetics of formation of diethylene glycol (DEG) (ether bond) which is an important side reaction in preparing polyethylene terephthalate was investigated. The following empirical rate expression is proposed for convenience of engineering applications It has been found by experiment that n = 0.9; apparent activation energy E = 8.2 kcal/mol. The equation can be used to predict the quantity of DEG formed in the reaction. The influence of the process conditions and reactor types on DEG content in polymer are also discussed.
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Renwen et al. (1983) studied this question.
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