Numerical Simulation of a Two-Phase Flow for the Acrylonitrile Electrolytic Adiponitrile Process in a Vertical/Horizontal Electrolysis Cell

• Published in: Energies (Basel) Vol. 11; no. 10; p. 2731
• Main Authors: Jang, Jiin-Yuh, Gan, Yu-Feng
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.10.2018
• Subjects: Acrylonitrile; acrylonitrile electrolytic adiponitrile; Anode effect; Boundary conditions; Bubbles; Cartesian coordinates; Computational fluid dynamics; Computer simulation; Current density; Dispersion; Drag; Drag coefficients; Efficiency; Electric fields; Electric potential; Electrical conductivity; Electrical resistivity; Electrochemistry; Electrodes; Electrolysis; Electrolytes; Flow rates; Fluid flow; Frontotemporal dementia; Gas flow; Gases; Horizontal cells; International conferences; Kinetic energy; Kinetics; Laboratories; Liquid phases; Lubrication; Mass flow rate; Mathematical models; Multiphase flow; Reaction kinetics; Simulation; Turbulence; Turbulence models; two-phase flow; Vapor phases; Viscosity; void fraction; France; United States > US
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en11102731

This paper investigated the effect of oxygen holdup on the current density distribution over the electrode of a vertical/horizontal electrolysis cell with a two-dimensional Eulerian–Eulerian two-phase flow model in the acrylonitrile (AN) electrolytic adiponitrile (ADN) process. The physical models consisted of a vertical/horizontal electrolysis cell 10 mm wide and 600 mm long. The electrical potential difference between the anode and cathode was fixed at 5 V, which corresponded to a uniform current density j = 0.4 A/cm2 without any bubbles released from the electrodes. The effects of different inlet electrolyte velocities (vin = 0.4, 0.6, 1.0 and 1.5 m/s) on the void fraction and the current density distributions were discussed in detail. It is shown that, for a given applied voltage, as the electrolyte velocity is increased, the gas diffusion layer thickness decreased and this resulted in the decrease of the gas void fraction and increase of the corresponding current density; for a given velocity, the current density for a vertical cell was higher than that for a horizontal cell. Furthermore, assuming the release of uniform mass flux for the oxygen results in overestimation of the total gas accumulation mass flow rate by 2.8% and 5.8% and it will also result in underestimation of the current density by 0.3% and 2.4% for a vertical cell and a horizontal cell, respectively. The results of this study can provide useful information for the design of an ADN electrolysis cell.