Selective Hydrotreating over Tungsten Nickel Sulfide Catalyst: Treatment of Cracked Gasolines

On the hydrodesulfurization of FCC gasoline: a review

“…As early as in the mid-1950s, in a study aiming at improving the lead susceptibility of cracked gasoline fractions by sulfur reduction, Casagrande et al [39] pointed out that it was possible to adjust the operating conditions of a process using a nickel-tungsten sulfide catalyst so as to perform efficient hydrodesulfurization while maintaining a good octane rating in the fraction. This was made possible by taking advantage of the acidic properties of the catalyst in order to promote skeletal isomerization of the olefins and hence compensate their saturation.…”

Reaction Studies with Mixtures of Pure Compounds

“…THE previous paper (4) the practical aspects of selective hydrotreating of cracked gasolines were discussed. The questions of reaction mechanism and reaction rates were not taken into consideration.…”

“…The experimental work was carried out in a laboratory unit with essentially the same flow scheme as that presented in the previous paper (4). Operating conditions for these experiments were similar to those used in the selective hydrotreating of thermally cracked gasoline: namely, 600°F ., 75 pounds per square inch gage, 2H2: oil mole ratio, and varying space velocities from 1.4 to 8.3.…”

Desulfurization of coal model compounds and coal liquids. [M. S. Thesis; treatment with metallic sodium or sodium salts followed by distillation]

“…Also predicted by Wiser, Hill and Lyon are hetero-aromatic compounds with sulfur present in thiophenic form (25). These compounds can also be called residual sulfur due to their generally high boiling points and molecular weights (26,27). Thiophene has been isolated from coal tar as a product of low-temperature pyrolysis (28,29).…”