Abstract
A computer model was developed to compare a conventional cocurrent trickle-bed reactor with two novel countercurrent three-phase reactors: the three-levels-of-porosity reactor and the internally finned monolith reactor. The hydrodesulfurization of a vacuum gas oil was taken as a case study. It was found that the application of countercurrent flow in the novel reactors results in significant increase of conversion. Sensitivity for mass transfer and H 2S inhibition were investigated. Reduced mass transfer compared to a conventional trickle-bed does not limit the reaction.
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