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Reactor design and optimization for converting crude (and refinery wastes) to chemicals in one step through steam-fluidized catalytic cracking

    Problem Statement

    The direct catalytic cracking from crude oil to chemicals could dominate the petrochemical industry shortly, with less fuel consumption and increasing production of light olefins and aromatics. We aim to simplify the refinery into a unique one-step conversion scheme, targeting the production of the most demanded petrochemicals.

    Using a bottom-up holistic approach, we design a catalytic crude-to-chemicals process toward this goal using a bottom-up holistic approach. We investigate advanced reactors with intrinsic kinetic data and controlled hydrodynamics to improve the process. We study the non-linear multiscale phenomena by coupling the hydrodynamics, heat transfer, and reaction kinetics.

    We use particle image/tracking velocimetry experiments, kinetic modeling, computational particle fluid dynamic modeling, and optimization approaches to improve operating scenarios and develop innovative reactor prototypes.

    We focus on the catalyst, reactor, and process levels for system enhancement and intensification. We are optimizing several state-of-the-art laboratory and pilot-scale units, including a circulating Berty, downer, and multifunctional fluidized bed reactors.

    C2C-FCC

    Goals

    • Develop and scale up advanced reactors for converting crude oil to chemicals through fluid catalytic cracking, approaching intrinsic kinetics
    • Model process dynamics using reactive particle fluid dynamics coupled with experimental validations
    • Establish a design workflow for short-contact time reactors based on modeling, prototyping, and testing
    • Analyze the novel process developments in fluid catalytic cracking: novel feedstock, process modifications, etc.

    Related People

    Related Publications

    The Role of Zeolite Acidity in Coupled Toluene Hydrogenation and Ring-Opening in One and Two Steps

    by Castaño, Pawelec, Aguayo, Gayubo, Arandes
    Ind. Eng. Chem. Res. Year: 2008

    Abstract

    In this work, the effect of HZSM-5 zeolite acidity on hydroconversion of methylcyclohexane and toluene has been studied. These are test reactions for the second step and the single step of aromatic valorization process, respectively, with the aim of obtaining C2+n-alkanes and isoalkanes. Monofunctional HZSM-5 zeolite catalysts (Si:Al ratio between 15 and 140) have been studied in methylcyclohexane ring opening while bifunctional catalysts (hybrid Pt/Al2O3-HZSM-5, same zeolites) have been used in the hydrocracking of toluene. Runs have been carried out in a fixed bed reactor under 250−450 °C and 20−80 bar. A positive effect of HZSM-5 zeolite acidity on methylcyclohexane conversion and C2+n-alkane selectivity is evident at certain conditions, whereas the maximum selectivity to isoalkanes requires an intermediate value of acidity. On the basis of the relationship between conversion and the Si:Al ratio of the HZSM-5 zeolite, the hydrogenolytic cracking of methylcyclohexane is proposed as a test reaction to determine the Si:Al ratio. Acidity has a highly favorable effect in the hydrocracking of toluene given that it avoids the thermodynamic restrictions for toluene hydrogenation and enhancing all the cracking steps during methylcyclohexane (MCH) transformation, which increases selectivity to C2+n-alkanes and isoalkanes.

    Keywords

    HCE HPC FCC