Process for the removal of small amounts of methyl acetylene and propadiene from hydrocarbon mixtures, which essentially comprises propylene, methyl, acetylene and propadiene consist

摘要

Gases containing propylene are purified by mixing with hydrogen and passing over a catalyst containing palladium, platinum or rhodium or a mixture of two such metals, at above 120 DEG C. Propadiene and methyl acetylene are selectively hydrogenated. The catalyst may contain 0.001-1% of palladium and preferably also platinum or rhodium supported on alumina, silica, kieselguhr, carbon or diatomaceous earth. The gas may be passed at 400-10,000 standard volumes per hour per volume of catalyst at 120-250 DEG C. and 0-500 p.s.i.g. The gas may contain up to 2% by volume of impurities and hydrogen is added in amount of 1-50 times the stoichiometric quantity for hydrogenation of the impurities.