AbstractExperiments at various Sb2O3concentrations were made in a pilot plant and the effect of Sb2O3on continuous esterification between terephthalic acid (TPA) and ethylene glycol (EG) was obtained. Reaction rate constants of the previously reported reaction scheme were determined to fit with the experimental data obtained. It was found that the effect of Sb2O3on reaction rate constant (ki) can be expressed as follows.k1= (3.75 × 10−4Sb + 1.0) × 1.5657 × 109exp(−19,640/RT)k2= (4.75 × 10−4Sb + 1.0) × 1.5515 × 108exp(−18,140/RT)k3= (6.25 × 10−4Sb + 1.0) × 3.5165 × 109exp(−22,310/RT)k4= (4.50 × 10−4Sb + 1.0) × 6.7640 × 107exp(−18,380/RT)k5= (3.50 × 10−4Sb + 1.0) × 7.7069 × exp(−2810/RT)k6= (1.75 × 10−4Sb + 1.0) × 6.2595 × 106exp(−14.960/RT)k7= (3.75 × 10−4Sb + 1.0) × 2.0583 × 1015exp(−42,520/RT)Simulation of esterification with these reaction rate constants at various Sb2O3concentrations was made and the following results were obtained.1Sb2O3accelerates the esterification reaction between TPA and EG.2Sb2O3accelerates the main reaction and its effects on side reactions are minor. The higher the addition rate of Sb2O3, the lower the carboxyl end‐group concentration (AV) and diethylene glycol content (DEG).3The comparison between simulation with potassium titanium oxyoxalate (PTO) in the previous report and with Sb2O3in the present report shows that the acceleration of polycondensation reaction by Sb2O3is highe
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