TWO STAGE RESIDUAL OIL HYDRODESULFURIZATION PROCESS WITH AMMONIA ADDITION

摘要

A process for hydrodesulfurization of an asphaltic oil in the presence of a catalyst comprising Group VI and Group VIII metals on alumina in two stages in series wherein a greater quantity of catalyst is required in the second stage than in the first stage. Ammonia is added to the second stage to tend to equalize the amount of catalyst and the space velocity in each stage.