process for selective hydrogenation of small amounts of acetylenkohlenwasserstoffen ueberwiegend conjugated diolefins from mixtures containing

摘要

Acetylenic hydrocarbons in admixture with conjugated diolefines, particularly C4 acetylenes in admixture to the extent of up to 2000 p.p.m. with 1,3-butadiene, are selectively hydrogenated by passage over a copper-oxide-chromium oxide catalyst containing 20-70% copper oxide and 80-30% chromium oxide, the amount of hydrogen being at least equivalent to the acetylenic hydrocarbons, and preferably being 2-10 moles, and the pressure and temperature being 15-50 p.s.i.g. and 100-250 DEG F., respectively. A suitable catalyst is that containing 50-55% copper oxide and 40-45% chromium oxide, prepared according to the disclosure of U.S.A. Specification 2,088,425. Other catalysts are produced by precipitation with ammonia or other water-soluble base from an aqueous copper and chromium-containing solution and calcination of the precipitate at 600-800 DEG F.