Simulation and Optimization of the CWPO Process by Combination of Aspen Plus and 6-Factor Doehlert Matrix: Towards Autothermal Operation

• Main Authors: Jose L. Diaz de Tuesta, Asunción Quintanilla, Daniel Moreno, Víctor R. Ferro, Jose A. Casas
• Format: Article
• Language: English
• Published: MDPI AG 2020-05-01
• Series: Catalysts
• Subjects: catalytic wet peroxide oxidation; carbon catalyst; ASPEN plus; simulation and optimization; design of experiments; energetic efficiency
• Online Access: https://www.mdpi.com/2073-4344/10/5/548

This work aims to present an industrial perspective on Catalytic Wet Peroxide Oxidation (CWPO) technology. Herein, process simulation and experimental design have been coupled to study the optimal process conditions to ensure high-performance oxidation, minimum H₂O₂ consumption and maximum energetic efficiency in an industrial scale CWPO unit. The CWPO of phenol in the presence of carbon black catalysts was studied as a model process in the Aspen Plus^® v11 simulator. The kinetic model implemented, based on 30 kinetic equations with 11 organic compounds and H₂O₂ involvement, was valid to describe the complex reaction network and to reproduce the experimental results. The computer experiments were designed on a six-factor Doehlert Matrix in order to describe the influence of the operating conditions (i.e., the different process temperatures, inlet chemical oxygen demands, doses of H₂O₂ and space time) on each selected output response (conversion, efficiency of H₂O₂ consumption and energetic efficiency) by a quadratic model. The optimization of the WPO performance by a multi-criteria function highlighted the inlet chemical oxygen demand as the most influential operating condition. It needed to have values between 9.5 and 24 g L⁻¹ for autothermal operation to be sustained under mild operating conditions (reaction temperature: 93–130 °C and pressure: 1–4 atm) and with a stoichiometric dose of H₂O₂.