銅・クロム・マンガン酸化物触媒の性能について-10-

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The authors have studied on the activtiy and selectivity of the copper-chromium-manganese oxide catalyst for the hydrogenation of carbon-carbon double bond and carbonyl radical of “wet” crotonaldehyde in the vapor phase. It was found that in the presence of excess hydrogen (H2 : crotonaldehyde=over 6 : 1mole) at the temperature of 170200°C and LHSV (liquid hourly space velocity) at 0.4, croton-aldehyde was almost completely hydrogenated to butyl alcohol and a small amount of higher boiling substances, such as 2-ethylhexenal, were byproduced. The authors also found that in the presence of the limited hydrogen (H2 : crotonaldehyde=1.31.5mol) at the temperature of 170200°C and LHSV at 0.30.5, almost crotonaldehyde was selectively hydrogenated to butylaldehyde with a small amount of higher boiling substance. The amount of the by-products may greatly be reduced by using the “dry” crotonaldehyde or “wet” croton-aldehyde mixed with butyl alcohol (1 : 1) as raw material. From the facts, the authors are considering that the formation of high boiling substances would account for free water present in the reactant and not for the unavoidable side reaction due to the catalyst.