Design equations based on micro/macromixing theoretical analysis of RTD curves for a tubular concentric electrochemical reactor with expanded meshes as electrodes

In the present work, the liquid flow pattern in a Tubular Electrochemical Reactor (T-ECR) with concentric cylindrical expanded meshes as electrodes and inlet/outlet distributors of shower sprinkler type was evaluated. It was found that the CID theoretical results describe the experimental F(r)-curves obtained with the methodology of step-signal input. Later, the F(t)-curves estimated with CFE) for each reactor zone were adequately approximated with global parametric models for the development of the T-ECR design equations. The Stagnant Zone Model with mass exchange with the anodic zone turns out to be adequate for the reactor shell zone. However, for the cathode and anode meshes, the Axial Dispersion Model with mass exchange between them proves to be appropriate. For all liquid flow rates (0.37 to 4.0 L min(-1)), the dispersion numbers (N-d) are in a magnitude order of small dispersion (D-ax /u(int) L-z approximate to 0.01). This confirms that the incorporation of inlet/outlet distributors in a T-ECR improve considerably the liquid flow pattern behaviour. This experimental methodology, coupled with micro/macromixing theoretical analysis of RTD curves with CFD, can be a good alternative for the reactor design.

Automated summary

The liquid flow pattern in a Tubular Electrochemical Reactor (T-ECR) was evaluated with concentric cylindrical expanded meshes as electrodes and shower sprinkler type inlet/outlet distributors. Theoretical results were found to match experimental curves, aiding in the development of design equations. Incorporating inlet/outlet distributors in a T-ECR significantly improves liquid flow behavior, making it a good alternative for reactor design.