This paper presents a semi-empirical model to predict catalyst life in hydrodesulfurization reactors. Four reactors were studied over a period of three years. A finite difference scheme is used to model transient, forced convective flow and heat transfer in an axisymmetric packed bed made up of layers of varying permeability. Predicted temperatures compare extremely well with measurements. A semi-empirical model, using hydrogen partial pressures, feed quality (primarily aromatics content) and temperatures has been developed and is used to predict coke deposition on the catalyst. Data from a run in 2010-2011 were used to develop the model. The model then predicted coke deposition rates for the 2011-2012 run, and also predicted that catalyst life would be adequate to run till a planned unit shutdown. At the end of the run, several catalyst samples were analyzed. Predicted coke deposition quantities were found to be within 5-10% of the measured coke content.

Simulating catalyst deactivation in hydrodeslufurization reactors: Comparison of predicted and modeled temperatures and coke deposition rates

245th National Meeting (2013)

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