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US 4,625,067 AGranted
Hydroformylation catalyst removal
AssigneeExxon Research & Engineering Co.
InventorJean A. A. Hanin
Life of this patent
Estimating the term…
Abstract
Cobalt values are removed from the crude product of a cobalt-catalyzed hydroformylation reaction by contacting the product with stripping gas to entrain volatile cobalt compounds, in the presence of water or aqueous acid to dissolve cobalt values not so entrained.
Claims22
The method for removing cobalt values from the crude product of a cobalt-catalyzed hydroformylation reaction, said crude product containing cobalt compounds in addition to an organic hydroformylation reaction product, which comprises:
- (a) contacting said crude product with a stream of stripping gas in the presence of water or aqueous acid at a temperature of not greater than 100? C. and at a pressure below 10 atmospheres, said pressure being lower than the decomposition pressure of said cobalt compounds at said contacting temperature, to entrain volatile cobalt compounds in said stripping gas and to form an aqueous phase containing cobalt values dissolved therein;
- and (b) separating said aqueous phase from said organic hydroformylation reaction product.
A method for producing higher aldehydes and higher alcohols which comprises:
- (a) hydroformylating an olefinic feddstock with synthesis gas in the presence of a cobalt-containing catalyst to form a product mixture containing higher aldehyde, higher alcohol, secondary products and dissolved cobalt catalysts;
- (b) removing said cobalt catalysts from said product mixture by contacting said product mixture at a temperature of from 60.degree. to 100.degree. C. with a stream of stripping gas comprising carbon monoxide and hydrogen at a pressure below 10 atmospheres in the presence of an aqueous acid to entrain volatile cobalt compounds in said gas and to form an aqueous phase containing cobalt values dissolved therein;
- (c) separating said aqueous phase from said aldehyde and said alcohol and recovering said aldehyde and alcohol as hydroformylation reaction product;
- (d) recovering the stripping gas containing said volatile cobalt compounds and contacting said recovered gas with said liquid olefinic feedstock to dissolve said cobalt compounds therein;
- and
- (f) recycling said contacted liquid olefinic feedstock to said hydroformylation step (a).
3 more elements
Dependencies are inferred from the claim text.