PATENTS

      1496.  ------.  [I. G. FARBENINDUSTRIE, A. G.]  [Production of Oxidation Products of Carboxylic Acids.]  German Patent Appl. I 66,643. OZ 12,052, filed Mar. 7, 1940 (Cl. IV d-12 o).  FIAT Reel B-196. frames 658-665: PB 83,253.

            In producing oxygenated products of carboxylic acids by the catalytic oxidation of hydrocarbons, the liquid, olefinic hydrocarbons obtained through the catalytic hydrogenation of CO by H₂, preferably under pressure and in presence of Fe catalysts, are subjected to oxidation by air of other O₂-containing gases.  Such hydrocarbon mixtures are very rich in olefins (up to 70-80%), particularly when they are produced from a synthesis gas containing <2 vol. H₂-1 CO.  Suitable catalysts for the oxidation are those consisting of Mn, Cu, Pb, Co, or alkali- and alkaline-earth compounds.  The best temperature is 70º-140º .  For the lower-boiling fractions pressure is often necessary (up to 200 atm.) ad a higher temperature (up to 180º).  The oxygenated products have good lubricating properties: are solvents for natural and synthetic resins: and re useful as solvents and thinners in the paint and dye industries, as softeners in the linoleum, oil-cloth, patent leather, and plastic fields, and as an assistant in the finishing of textiles and leather as a substitute for fatty oils.