Thermodynamic and Kinetic Study on the Catalysis of Isoamyl Acetate by a Cation-Exchange Resin in an Intensified Fixed-Bed Reactor

Abstract

Kinetics and thermodynamics of esterification by a cation-exchange resin in an intensified fixed-bed reactor was studied systematically. The resin type, catalyst loading, volume flow rate, initial molar ratio, temperature, and catalyst reusability were studied and optimized. The nonideality of the reaction system was corrected by the UNIFAC group contribution method. The Δ r H 0 , Δ r S 0 , and Δ r G 0 of the reaction were acquired by two methods. The pseudo-homogeneous (PH) model and the Langmuir–Hinshelwood–Hougen–Watson (LHHW) model were adopted to simulate the kinetic process. The result indicated that the LHHW model was better suited to simulate the kinetic process than the PH model.

Thermodynamic and Kinetic Study on the Catalysis of Isobornyl Acetate by a Cation Exchange Resin an Intensified Fixed-Bed Reactor

“…Plot lnK versus 1/T, as shown in Figure 8. According to the slope and intercept of the image, the enthalpy change ∆ 0 is-29.54kJ/mol, and the entropy change ∆ 0 is -54.35J/(mol•K) .According to the Gibbs free energy formula (17), the Gibbs free energy ∆ 0 is -13.55kJ/mol, so the chemical equilibrium constant expression for the reaction of camphene and acetic acid can be expressed as:…”

“…After the reaction occurs, the product desorbs and diffuses from the surface of the catalyst to the main body of the solution. For IFBR, when the volume flow rate reaches a certain value, the reaction rate basically no longer changes, indicating that the influence of the entire process of external diffusion on the reaction rate can basically be ignored [16], Based on the relevant literature analysis of our research group, When the liquid circulation flow in the IFBR unit is set at 40 mL/min, the influence of external diffusion can be eliminated [17].…”