| 摘要 |
<p>Aldehydes, ketones and carboxylic acids are obtained by reacting an olefine with oxygen or a gas containing oxygen in a neutral to acid medium in the presence of water and a catalyst comprising a salt of palladium, iridium, ruthenium, rhodium or platinum, and a salt of a metal which can exhibit different valencies under the reaction conditions and which during the reaction conditions is reduced to another metal compound but not the metal itself, the gaseous and vaporous portions of the reaction products, after leaving the reactor, being contacted with one or more metals and/or metal alloys which have a potential in the electromotive series more positive than -1.7 and more negative than the noblest components of the catalyst. Salts of metals which may exhibit different valencies are, for example, those of copper, mercury, cerium, thallium, tin, lead, titanium, vanadium, antimony, chromium, molybdenum, uranium, manganese, iron, cobalt or nickel. The metals or alloys of an electrochemical potential above -1.7 should have a large surface area and suitable ones are iron, iron alloys with carbon, silica or chromium or chromium alloys, cadmium or cadmium alloys, zinc or zinc alloys with copper, aluminium, chromium, or iron or magnesium alloys. The preferred salts of palladium, iridium, ruthenium, rhodium or platinum are the chlorides. Specifications 922,694 and 938,831 also are referred to.</p> |
