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2016-09-12 - Colloque/Présentation - poster - Anglais - 1 page(s)

Meunier Nicolas, Chauvy Remi , Dubois Lionel , Thomas Diane , De Weireld Guy , "CO2 re-use from oxyfuel cement kilns: Optimization of the CO2 catalytic conversion into methanol, poster presentation" in International Conference on Carbon Dioxide Utilization (ICCDU XIV), Sheffield, United Kingdom, 2016

  • Codes CREF : Traitement des effluents gazeux (DI3843), Technologie de l'environnement, contrôle de la pollution (DI3841), Thermodynamique chimique (DI132C), Génie chimique (DI2721), Chimie (DI1300)
  • Unités de recherche UMONS : Génie des Procédés chimiques et biochimiques (F505), Thermodynamique, Physique mathématique (F506)
  • Instituts UMONS : Institut de Recherche en Energétique (Energie)

Abstract(s) :

(Anglais) For several decades, the reduction of anthropogenic carbon dioxide emissions from industries (power plants, cement plants …) has become one of the most crucial issue of our society. Therefore, new innovating technologies concerning Carbon Capture and Storage (CCS: assisted recovery of hydrocarbons, mineralization, mineral trapping …) and Carbon Capture and Utilization (CCU: catalytic conversions, building blocks for polymers, dry/wet reforming, photo-electro-catalysis …) are being widely investigated. In this framework, we previously described an innovative 3-step purification process[1] to purify CO2-rich flue gases coming from simulated oxyfuel cement kilns. Following this study, the next step is the investigation of the catalytic conversion of purified CO2 into methanol, one of the most promising valuable chemical compounds when envisaging the reuse of industrial CO2. The current research is then dedicated to the optimization of the catalytic conversion process which converts purified CO2 coming from the investigated purification process into methanol. This process relies on two catalytic reactors: the first shaft reactor being adiabatic (without recycle) and the second one being tubular, isotherm and working at 260°C (with recycle). The catalysts used in these reactors are CuO/ZnO/Al2O3-type catalysts, which are currently described by the Langmuir-Hinshelwood kinetic data from the works of Graaf et al.[2]. The water-methanol mixture produced in both reactors is then flashed and separated in a distillation column to provide a pure and continuous methanol stream with a purity higher than 99 mol%. The simulations of this conversion process have been performed on Aspen Plus® in which the operative parameters (such as the pressure/temperature in reactors, the size of reactors, the pressure of the flash unit and distillation column, …) have been varied to quantify their respective influence on the process performances (methanol purity and recovery). As a result, this study also proposes a methodological approach to optimize this CO2 conversion unit regarding these process performances, but also regarding economic indicators (such as OPEX and CAPEX). Furthermore, heat integration is another crucial point investigated in this study with the aim to propose an integrated and optimized methanol conversion process. Apart from the simulated results, experiments are conducted to update the kinetic laws described by Graaf et al. in 1990 with currently available commercial catalysts to compare their conversion performances and evaluate their assets. Furthermore, experiments are conducted in our laboratory on a micro-pilot scale reactor with CO2/H2 mixtures to illustrate the influence of operative parameters on the conversion performances of the selected catalysts and to validate the predicative results obtained by the simulations. Finally, this study also presents a Life Cycle Analysis (LCA) of the purification and conversion process in order to evaluate the real impact of this CO2-to-Methanol process in the potential reduction of anthropogenic carbon dioxide emissions.