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Effect of titanium dioxide on direct esterification between terephthalic acid and ethylene glycol
Author(s) -
Yamada T.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070450503
Subject(s) - terephthalic acid , titanium dioxide , ethylene glycol , reaction rate constant , titanium , ethylene , chemistry , materials science , nuclear chemistry , organic chemistry , catalysis , metallurgy , kinetics , physics , polyester , quantum mechanics
Experiments at various concentrations for A and B kinds of titanium dioxide were made in the pilot plant, and the effect of titanium dioxide on continuous esterification between terephthalic acid and ethylene glycol was obtained. Reaction rate constants of the reaction scheme reported by Yamada et al. (1985) were determined o fit with the experimental data obtained. It was found that titanium dioxide ([TDO]) does not exert an influence on the reaction rate constants of k 1 , k 2 , and k 4 but does on the reaction rate constants of k 3 , k 5 , k 6 , and k 7 as follows: k l = 1.5657 × 10 9 exp(−19,640/ RT ) k 2 = 1.5515 × 10 8 exp(−18,140/ RT ) k 3 = (0.10[TDO] + 1) × 3.5165 × 10 9 exp(−22,310/ RT ) k 4 = 6.7640 × 10 7 exp(−18,380/ RT ) k 5 = (0.08[TDO] + 1) × 7.7069 exp(−2,810/ RT ) k 6 = (0.04[TDO] + 1 ) × 6.2595 × 10 6 exp(−14,960/ RT ) k 7 = (0.60[TDO] + 1) × 2.0583 × 10 15 exp(−42,520/ RT ) for B kind k 7 = (0.085714[TDO] + 1) × 2.0583 × 10 15 exp(−42,520/ RT ) for A kind Applying these reaction rate constants, simulation of continuous esterification in the first tank reactor was made and the following results were obtained ( 1) The acceleration effect of titanium dioxide on the esterification reaction is minor, and there is hardly any difference in the effect on the esterification due to kinds of titanium dioxide. ( 2 ) The amount of diethylene glycol formation largely varies with kinds of titanium dioxide.