1 research outputs found
Reaction Kinetics and Thermodynamic Equilibrium for Butyl Acrylate Synthesis from <i>n</i>āButanol and Acrylic Acid
The esterification reaction of <i>n</i>-butanol with
acrylic acid in the presence of a commercial ion-exchange resin, Amberlyst
15-wet, was carried out in a batch reactor. The reactions were performed
at different temperatures (50 to 90 Ā°C), different <i>n</i>-butanol/acrylic acid molar ratios (2 and 3), and different catalyst
amounts (1 wt % to 3.5 wt %). Different reaction rate expressions
were evaluated. A simplified LangmuirāHinshelwoodāHougenāWatson
kinetic model was found to be the best model to describe the experimental
results. This model is given by the following expression: <i>r</i> = <i>K</i><sub>c</sub>Ā·((<i>a</i><sub>1</sub>Ā·<i>a</i><sub>2</sub> ā (<i>a</i><sub>3</sub>Ā·<i>a</i><sub>4</sub>)/<i>K</i><sub>eq</sub>)/(1 + <i>K</i><sub>4</sub>Ā·<i>a</i><sub>4</sub>)<sup>2</sup>), with <i>k</i><sub>c</sub> (molĀ·<i>g</i><sub>cat</sub><sup>ā1</sup>Ā·min<sup>ā1</sup>) = 1.52 Ć 10<sup>7</sup> ā
66ā988/(<i>RT</i>) and <i>K</i><sub>4</sub> = 1.589. Also equilibrium experiments were carried out. The proposed
equilibrium equation was <i>K</i><sub>eq</sub> = exp((ā(1490
Ā± 577)/<i>T</i> + (7.21 Ā± 1.67)). From this equation,
it was possible to determine the reaction standard enthalpy and entropy
values: Ī<i>H</i>Ā° = 12.39 Ā± 4.80 [kJ/mol]
and Ī<i>S</i>Ā° = 59.98 Ā± 13.87 [J/molĀ·K]