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AssigneeEastman Kodak Company
InventorsJohn L. Dawes, Thomas J. Devon
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This invention concerns an oxo process, either batch or continuously operated, for the preparation of aldehydes, principally in relatively high proportions of branched isomer, from olefins and synthesis gas employing an unmodified rhodium catalyst feed or recycle such as the rhodium salts of organic carboxylic acids. More particularly the invention concerns such a process wherein at least a portion of the reaction medium, e.g., the oxo reactor effluent, is contacted with a ligandizing compound such as triphenylphosphine, prior to product recovery by distillation, such that the rhodium catalyst is converted to a stable form and not lost by plating out on the distillation column or base heater during the distillation. Thereafter, the catalyst is deligandized and regenerated by air treatment and reused in the process.
A hydroformylation process comprising contacting at least one olefin of from 2 to 20 carbon atoms in a reaction zone at a temperature of from about 20.degree. C. to about 300.degree. C. and a pressure of from about 15 psig to about 10,000 psig with hydrogen, carbon monoxide and a catalyst consisting essentially of unmodified rhodium for a sufficient period of time to produce aldehyde product, contacting reactor effluent with at least one ligand selected from trimethylphosphite, triethylphosphite, butyldiethylphosphite, tri-n-propylphosphite, tri-n-butylphosphite, tri-2-ethylhexylphosphite, tri-n-octylphosphite, tri-n-dodecylphosphite, triphenylphosphite, trinaphthylphosphite, triphenylphosphine, tri(p-chlorophenyl)phosphite, trinaphthylphosphine, phenyldiphenylphosphinite, diphenylphenylphosphonite, diphenylethylphosphonite, triphenylarsine, triphenylstibine, tris(p-chlorophenyl)phosphine, tri(p-cyanophenyl)phosphite, tri(p-methoxyphenyl)phosphite, and ethyldiphenylphosphinite, and separating said product from said effluent in a distillation zone at a temperature of about 120.degree. C. or less to leave a base product.
Dependencies are inferred from the claim text.