CATALYST AND PROCESS FOR SELECTIVE HYDROGENATION OF ALKYNES AND DIENES.

摘要

Selective hydrogenation process comprising: ° contacting in the presence of hydrogen an hydrocarbon feedstock comprising at least one unsaturated compound selected from the group consisting of al kynes and dienes and mixtures thereof with a first hydrogenation catalyst in a first reaction zone to produce a first product stream having a reduced proportion of alkynes and/or dienes; and ° contacting the first product stream in a second reaction zone having an inlet and an outlet, in the presence of optional additional hydrogen, with a second hydrogenation catalyst to produce a second product stream, wherein, the first hydrogenation catalyst comprises: ° a first constituent of at least one metal or metal-based component selected from the elements consisting of Groups 1-10 of the Periodic Table of Elements (new IUPAC notation) and optionally a second constituent of at least one metal or metal-based component selected from the elements consisting of Groups 11-14 of the Periodic Table of Elements, and said first constituent and optional second constituent are on a carrier made essentially of SiC or of an alkaline earth metal silicate. Hydrogenation catalyst comprising : ° a first constituent of at least one metal or metal-based component selected from the elements consisting of Groups 1-10 of the Periodic Table of Elements (new IUPAC notation) and a second constituent of at least one metal or metal-based component selected from the elements consisting of Groups 11 -14 of the Periodic Table of Elements, and ° said first constituent and second constituent are on a carrier made essentially of an alkaline earth metal silicate or of SiC, ° the second constituent is optional if the carrier is made essentially of SiC.