Process for selectively hydrogenating a hydrocarbon cut containing at least one diolefinic hydrocarbon and at least one acetylenic hydrocarbon using a palladium catalyst with crystallites of at least 50 angstroms

摘要

Process for selectively hydrogenating acetylenic hydrocarbons such as vinylacetylene contained in an unsaturated hydrocarbon fraction such as a C4 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 Angströms, 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 Angströms.