Process for producing 1,9-nonanedial
AssigneeKuraray Co., Ltd.
InventorsMitsuo Matsumoto, Noriaki Yoshimura, Masuhiko Tamura
Life of this patent
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Abstract
A process for producing 1,9-nonanedial which comprises hydroformylating 7-octen-1-al with a mixture of hydrogen and carbon monoxide in an aqueous sulfolane or 1,4-butanediol solution in the presence of a rhodium complex and the sodium, potassium or lithium salt of m-(diphenylphosphino)benzenesulfonic acid, extracting 1,9-nonanedial from the reaction mixture with a primary alcohol or a mixture of a primary alcohol and a saturated aliphatic hydrocarbon, and recycling the extraction residue containing the catalyst components to the 7-octen-1-al hydroformylation step.
Claims9
A process for producing 1,9-nonanedial, which comprises the steps of:
- (I) hydroformylating 7-octen-1-al with a mixture of hydrogen and carbon monoxide in an aqueous solution of sulfolane or 1,4-butanediol in which the weight ratio of sulfolane or 1,4-butanediol to water is 15/85 to 75/25, in the presence of (a) a rhodium complex and (b) the sodium, potassium or lithium salt of m-(diphenylphosphino)-benzenesulfonic acid at a temperature of 40.degree. C. to 110.degree. C.;
- (II) extracting 1,9-nonanedial from the reaction mixture obtained in step (I) with a saturated aliphatic primary alcohol containing about 5 to 11 carbon atoms or a mixture of said primary alcohol and a saturated aliphatic hydrocarbon containing about 5 to 10 carbon atoms;
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- (III) recycling the extraction residue containing the catalyst components obtained in step (II) to the hydroformylation step (I).
Dependencies are inferred from the claim text.