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AssigneeInstitute Francais du Petrole
InventorsJean Cosyns, Robert Stern, Jean-Francois Le Page
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Process for selectively hydrogenating acetylenic hydrocarbons such as vinylacetylene contained in an unsaturated hydrocarbon fraction such as a C.sub.4 fraction also containing a diolefinic hydrocarbon such as butadiene, without substantially hydrogenating said diolefinic hydrocarbon, comprising the step of contacting said fraction, at least partially in the liquid phase, in the presence of hydrogen, with a catalyst of palladium on alumina whose palladium crystallites have an average size of at least 50 Angstroms, said step being optionally followed with a step of contacting the resultant fraction from the preceding step, in the presence of hydrogen, with a catalyst of palladium an alumina whose palladium crystallites have an average size of at most 45 Angstroms.
In a process for selectively hydrogenating a hydrocarbon fraction containing simultaneously at least one diolefinic hydrocarbon and at least one acetylenic hydrocarbon, including the hydrogenation of the acetylenic hydrocarbon but without substantial hydrogenation of the diolefinic hydrocarbon, wherein said fraction, at least partially in the liquid phase, and hydrogen are contacted with a catalyst of palladium on alumina, the improvement wherein the average size of the palladium crystallites in said catalyst is of at least 50 Angstroms, whereby the selective hydrogenating activity of the catalyst is substantially prolonged.
Dependencies are inferred from the claim text.