| 摘要 |
<p>1,228,348. Oxo process; butanols; 2-ethylhexanol. UGINE KUHLMANN. 12 Feb., 1969 [15 Feb., 1968], No. 7605/69. Heading C2C. Butanols are prepared by hydroformylation of propylene in the presence of a cobalt carbonyl using as solvent a mixture of butyl ethers, at least part of which is obtained by catalytic dehydration of butanols formed during the hydroformylation reaction. The dehydration may be effected by heating with metal sulphates or oxides, H 2 50 4 or H 3 P0 4 . The butyl ethers facilitate the recovery of the catalyst as cobalt tetracarbonyl hydride salts formed by alkali treatment by reducing the solubility thereof in the organic reaction medium, allowing them to be extracted with water. The above process may be built into a process for the preparation of 2-ethylhexanol in which after removal of the catalyst, isobutanal is distilled off and the residue treated with alkali to convert n-butanol by an aldolizing-crotonizing reaction into 2-ethylhexenal (and also to hydrolyse butyl formates present as by-products to butanols); the resulting mixture is catalytically hydrogenated to convert the ethylhexenol to 2-ethylhexanol; the product is then distilled to separate an azeotropic mixture of butanols and butyl ethers (which is then dehydrated to convert the butanols to butyl ethers) from a mixture of ethylhexanol and butyl ethers which is further distilled to separate the constituents thereof; the butyl ethers from the aforesaid conversion and those from the aforesaid further distillation are used at least in part as solvents in a further hydroformylation of propylene.</p> |
