Hydrogen Consumption by Reaction Average Contributions

The calculation of hydrogen consumption when experimental information is not sufficient or for quick estimations can be done according to acqnired experience. Edgar (1993) reported the following average contributions of each HDT reaction to the hydrogen consumption (scf/bbl)  

In addition to Edgar equations, Speight (1999) presented a correction in hydrogen consumption by metal content (Table 12.11). 

Correction in Hydrogen Consumption as Function of Metals Content 

In general, the calculation of hydrogen consumption by means of kinetics is done by the summation of the rates of all H2-consuming reactions of course, the stoichiometry of each reaction, that is, stoichiometric coefficients must be taken into account. Thus, the more reactions the kinetic model includes in which hydrogen is present, the better and more precision in the estimation of hydrogen consumption. 

Various simplified approaches based on kinetics have been reported in the literature. Papayannakos and Georgiou (1988) developed a kinetic model for hydrogen consumption during catalytic hydrodesulfurization of a residue in a trickle-bed reactor. The atmospheric residue of Greek petroleum deposits in the Aegean Sea was used as feedstock. They found that the kinetic model correlated well with the experimentally measured hydrogen consumption. 

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