Kinetic Measurement and Modeling of a Slow-Rate Diazo Coupling Reaction

Abstract

The reaction network of the diazo coupling between 1-hydroxy-6-nitro-4-sulfonaphthalene-2-diazonium salt and 2-naphthol was identified through experimental methods. The kinetic experiments were conducted at the temperature range of 303–323 K. A kinetic model, which takes the decomposition of the diazonium salt into account, was established, and the kinetic parameters were estimated based on the experimental data. The model simulation results showed good agreement with the experimental data. Then, the effects of the reactant concentration, the molar ratio, and the reaction temperature were further investigated using the kinetic model. Finally, this kinetic model was coupled with a plug-flow reactor model and an axial dispersion model to reveal the influence of heat transfer and backmixing. This study can shed some light on the design and optimization of the industrial tubular reactors