Method for preparing primary alcohols having alkyls branched at the second carbon
AssigneeProduits Chimiques Ugine Kuhlmann
InventorsAuguste Gueant, Serge Mercier
Life of this patent
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Abstract
Aldehydes branched at the second carbon are surprisingly hydrogenated selectively in good yield to the corresponding primary alcohols over a copper catalyst by using a hydrogen/carbon monoxide mixture having molar ratio about 2/1; simultaneously said mixture is depleted of hydrogen to a level where it can be used directly in the Oxo-hydroformylation process without further pretreatment.
Claims10
A method for preparing a primary alkyl alcohol branched at the second carbon atom which comprises reacting over a hydrogenation catalyst which is insensitive to carbon monoxide under the reaction conditions and which does not form metal carbonyls
- a. an aldehyde, in the liquid phase, of formula ##STR6## wherein R' is H or alkyl and wherein R" and R'", and R' when it is alkyl, are the same or different C.sub.1 -C.sub.20 straight or branched alkyl or alkenyl or wherein R" and R'" together may be a methylene or an alkyl-substituted methylene having the formula ##STR7## wherein R.sub.a and R.sub.b, which can be the same or different, are H or C.sub.1 -C.sub.20 straight or branched alkyl or alkenyl, with
- b. a hydrogen/carbon monoxide gas mixture having a molar ratio of about 2/1,
- and continuing the reaction until the residual hydrogen/carbon monoxide molar ratio in the gas mixture reaches between about 1/1 and 1.5/1.
A method comprising reacting over a hydrogenation catalyst which is insensitive to carbon monoxide under the reaction conditions and which does not form metal carbonyls
- a. an aldehyde, in the liquid phase, of formula ##STR8## wherein R' is H or alkyl and wherein R" and R'", and R' when it is alkyl, are the same or different C.sub.1 -C.sub.20 straight or branched alkyl or alkenyl or wherein R" and R'" together may be a methylene or an alkyl-substituted methylene having the formula ##STR9## wherein R.sub.a and R.sub.b, which can be the same or different, are H or C.sub.1 -C.sub.20 straight or branched alkyl or alkenyl, with
- b. a hydrogen/carbon monoxide gas mixture having a molar ratio of about 2/1,
- continuing the reaction until the residual hydrogen/carbon monoxide molar ratio in the gas mixture reaches between about 1/1 and 1.5/1 and a primary alkyl alcohol branched at the second carbon atom is formed, separating said residual gas mixture from said reaction, and employing said residual gas mixture as a hydroformylation agent in the Oxo process to form an aldehyde.
Dependencies are inferred from the claim text.