| 摘要 |
A primary alcohol is produced by reacting an olefin with carbon monoxide and hydrogen in the presence of a soluble catalyst complex containing cobalt, carbon monoxide and a tertiary phosphine in a process wherein at least part of the catalyst is removed from the reaction zone and recycled and a purge stream containing dissolved catalyst and impurities is withdrawn from the recycle stream, at least part of the catalyst complex being recovered from the purge stream by conversion into a less soluble complex, isolation of the less-soluble complex and reconversion into the initial complex. Examples relate to conversion of propylene to n-butanol and 2-ethylhexanol, using a catalyst complex which is largely dicobalt hexacarbonyl-bis (tributylphosphine).ALSO:In a process for the production of a primary alcohol by reacting an olefin with carbon monoxide and hydrogen in the presence of a soluble complex catalyst containing cobalt, carbon monoxide and a tertiary phosphine in which process at least part of the catalyst is removed from the reaction zone and recycled a purge stream containing dissolved catalyst and impurities is withdrawn from the recycle stream, and at least part of the catalyst is recovered from the purge stream by conversion into another, less soluble cobalt carbonyl-tertiary phosphine complex, isolation of the less soluble complex and reconversion into the initial catalyst complex to be re-used in the process. The initial catalyst complex probably has the formula [Co(CO)3PA]2, where A is alkyl, alkaryl, aryl or aralkyl, and may be recovered by reducing the pH of the purge stream to 3.0 to 8.0, treating with carbon monoxide at a partial pressure of at least 10.2 atmospheres and a temperature of not more than 150 DEG C, optionally with addition of a polar solvent, recovering the less soluble form of the catalyst complex and converting it to the initial form, for example by slurrying in butanol and heating to drive off the carbon monoxide, or by dissolving the complex in a more polar solvent and recycling to the reaction zone for conversion in situ. In the Examples, the catalyst is largely dicobalt hexacarbonyl-bis (tributylphosphine). |
