Process

Details Process Process

C - Chemistry, Metallurgy

07

C

260/573.2

C07C 47/02 (2006.01) C07C 45/50 (2006.01)

Patent

CA 1129439

PROCESS ABSTRACT n-valeraldehyde is produced by hydroformylation of butene-l in the presence of one or more of cis- and trans-butene-2 and iso-butylene using a rhodium complex catalyst such as HRh(CO)PPh3)3. Reaction conditions include use of at least about 100 moles of free triorganophosphine per gram atom of rhodium, a temperature of about 80°C to about 130°C, a total pressure of not more than about 50 kg/cm2 absolute, a partial pressure of carbon monoxide of not more than about 1.5 kg/cm absolute, and a partial pressure of hydrogen of from about 1.5 to about 7.5 kg/cm absolute. An n-/iso-ratio of 20:1 and a conversion efficiency of butene-1 to n-valeraldehyde of over 85% are possible under these conditions with essentially no resin formation despite the presence of iso-butylene. The n-/iso-valeraldehyde mixture can be aldolized and reduced without intermediate purification to give a commercially acceptable C10-plasticiser alcohol.

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