Abstract:
Objective By optimizing the gradation ratio of various catalysts loaded in fixed bed residue hydrogenation reactor, the effects of demetalization, desulfurization and carbon residue removal were optimized as a whole.
Methods A residue-hydrogenation test unit with 4 series reactors was used to carry out the research.The reaction rate constants of HDNi, HDV, HDS and HDCCR in 4 reactors were obtained by changing the liquid volume space velocity.
Results The reactions of HDNi, HDV and HDS were more likely to occur in the second stage reactor, while the reaction of HDCCR was more likely to occur in the third stage reactor.After passing through the first three reactors, the remaining impurities were the most difficult to react, and the removal of impurities was more difficult in the fourth stage reactor.
Conclusions Based on the reaction rate constants of HDNi, HDV, HDS and HDCCR in each reactor, the residual oil hydrogenation kinetics model was constructed.The model can predict the impurity removal rate under different catalyst gradation schemes.The difference between the predicted value and the actual value of the model is within 1.7 percentage points, which can meet the needs of industrial applications.
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