Pilot tests of catalysts for selective hydrogenation of methylacetylene and propadiene

Abstract

The testing of KGS-3 catalyst is made in the reaction of selective hydrogenation of methylacetylene and propadiene from an industrial pyrolysis propane-propylene fraction into a pilot plant in two successive adiabatic flow reactors with a fixed catalyst bed. There is a definition of the optimal process conditions of hydrogenation, providing residual acetylene and diene impurities not more than 5 ppm: pressure in the system – 18 atm, the volume flow rate of hydrocarbons – 2100 h–1, the molar ratio of hydrogen to the amount of methyl acetylene and propadiene in the 1st and 2nd reactor respectively 1,1: 1,0 and 1,6 : 1,0, and temperature – 50 and 55 °С. Under these conditions, the KGS-3 catalyst provides total 100 % conversion of the methyl acetylene and propadiene with propylene selectivity 76,7 %. Expected service cycle of the catalyst is about 14 months. The catalyst may be used for the purification of hydrocarbon fractions containing up to 5 wt.% diene and acetylenic impurities.