Profiles and performance curves in a parallel-plate reactor for the electrochemical fluorination of hydrocarbons

Abstract

We have developed a simplified model for the steady-state operation of a parallel-plate electrochemical reactor for hydrocarbon fluorination. Model equations accommodate reduced conductivity of the initially liquid reaction mixture, two-phase hydrodynamics, and phase equilibrium due to the generation of gas in the process. Using continuum-model computer simulations, we investigate different reactant feed temperatures and exit pressures and calculate steady-state, one-dimensional profiles of current density, temperature, liquid volume fraction, and conversion for different applied potentials. A qualitative description of the gas-liquid flow is also provided. Different flow regimes have a significant effect on the liquid-volume-fraction profile and hence the current distribution to some extent. The local current density decreases along the reactor due to the increasing presence of gas. However, the majority of resistance exists in an anodic film. Ln general, trends of increased conversions with increased applied potential, increased exit pressure, and decreased feed temperature are verified. Conversions of less than 1% are calculated for all cases considered