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Removal of Cobalt Compounds from Cobalt Catalyzed Hydroformylation Reaction

IP.com Disclosure Number: IPCOM000247854D
Publication Date: 2016-Oct-06
Document File: 5 page(s) / 217K

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Abstract

The present description relates to a method for removing dissolved cobalt compounds from the effluent from a cobalt catalyzed hydroformylation reaction. This method is particularly useful in removing dissolved cobalt from crude products formed from olefinic feedstock having a carbon number in the range from C4 to C14, preferably from C5 to C9.

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Removal of Cobalt Compounds from Cobalt Catalyzed Hydroformylation Reaction

The present description relates to a method for removing dissolved cobalt compounds from the effluent from a cobalt catalyzed hydroformylation reaction. This method is particularly useful in removing dissolved cobalt from crude products formed from olefinic feedstock having a carbon number in the range from C4 to C14, preferably from C5 to C9.

Hydroformylation reactions involve the preparation of oxygenated organic compounds by reaction of carbon monoxide and hydrogen, for example synthesis gas (syn gas), with carbon compounds containing olefinic unsaturation. The reaction is performed in the presence of a cobalt carbonyl catalyst, typically hydridocobalt tetracarbonyl ((HCo)(CO)4) and results in the formation of a compound, for example an aldehyde, which has one more carbon atom in its molecular structure than the starting olefinic feed.

The crude product of the hydroformylation reaction will contain cobalt carbonyl, aldehyde, alcohols, syn gas and by-products. Before further processing of the crude product is possible, it is necessary to remove the cobalt carbonyl compounds therefrom.

U.S. Patent No. 4,625,067 discloses a method which involves contacting of the crude product with a stream of stripping gas to entrain volatile cobalt compounds wherein the contacting is performed at a temperature below 100°C and pressure below 10 atmospheres in the presence of aqueous acid to dissolve the cobalt compounds not so entrained under the conditions of temperature and pressure employed for the contacting, and the aqueous phase is subsequently separated from the organic hydroformylation reaction product.

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