A Continuous Lumping Model for Hydrocracking on a Zeolite Cata- lysts: Model Development and Parameter Identification
Résumé
Process models are a vital tool for the development of industrial hydrocracking units and to drive innovation
of process design and novel catalysts. A hydrocracking model, based on the continuous lumping
approach, is presented in this work. A zeolite catalyst was used for hydrocracking of pre-treated VGO
feeds. The model includes inhibition terms for organic nitrogen and NH3 gas. A total of 74 data points,
from experimental runs in a fixed-bed pilot plant, have been used for parameter identification (52 points)
and model validation (22 points). The model has been found to provide a good estimation of total residue
(>370 C cut) conversion and yield structure (naphtha, kerosene and diesel). A statistical analysis of the
12 model parameters, based on the Eigenvectors of the Hessian has been presented. The impact of the
individual parameters on the objective function was thus evaluated. This analysis can help guide future
refinement of the model.
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