Abstract: A process for the production of 2-ethyl-hexanol comprising reacting propene with carbon monoxide and hydrogen, in the presence of an aqueous catalyst containing rhodium and at least one sulfonated triarylphosphine, to form an aqueous phase and an organic phase, said organic phase comprising a mixture of materials having boiling points lower than that of n-butanal and substances having boiling points equal to or higher than that of n-butanal, said materials including i-butanal, separating said material from said substances, subjecting said substances to aldol condensation, in the presence of aqueous alkali, to form 2-ethyl hexenal, first hydrogenating said 2-ethyl-hexenal in a gas phase in the presence of a first hydrogenation catalyst and thereafter hydrogenating said 2-ethyl-hexenal in a liquid phase to form 2-ethyl-hexanol in the presence of a second hydrogenation catalyst.

Abstract: A process for the hydroformylation of olefins having 2 to 5 carbon atoms using rhodium catalysts in a low pressure process, wherein the waste gas from the low pressure plant containing the olefin is compressed and used in a high pressure plant.

Abstract: An improved process for continuously producing oxygen-containing compounds by the oxo process from olefins, carbon monoxide and hydrogen at a pressure of 5 to 1000 bar and at a temperature of 50.degree. to 200.degree. C. in the presence of a metal of Group VIII and/or a compound thereof as catalyst is disclosed. According to the invention, the unreacted olefin carbon monoxide and hydrogen is passed to a high pressure reactor wherein unreacted olefin is reacted under oxo process conditions to form oxygen-containing compounds.