Process for the production of 6-methylheptanone
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First Claim
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1. A process for the production of a methylketone of a formula (1) wherein x represents a number from 1-3, comprising:
- reacting hydrogen, acetone and an aldehyde of formula (2)
as reaction components;
wherein x represents a number from 0-2 and the broken lines each represent an olefinic double bond;
wherein said process is carried out as a 2-phase reaction and the reaction components are reacted in the presence of a catalyst suspension which contains a suspended heterogeneous hydrogenating contact and a dissolved, alkali- or earth alkali metal-containing aldolizing catalyst; and
wherein an aqueous phase of the catalyst suspension following phase separation of the aqueous phase from an organic phase, is used for a further reaction cycle at the end of the 2-phase reaction, wherein the catalyst suspension is a 2-phase mixture with acetone in the presence of hydrogen, and the aldehyde is continually dosed into it, and wherein the aldolizing catalyst is dissolved in the aqueous phase, which is also the suspension medium of the heterogeneous hydrogenating contact.
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Abstract
Methylheptanone and corresponding homologous methylketones, in particular phytone and tetrahydrogeranyl acetone, are produced by aldol condensation of isovaleraldehyde or prenal or the corresponding aldehydes with acetone in the presence of a catalyst phase, which contains an aldolizing catalyst and a heterogeneous hydrogenating catalyst.
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12 Claims
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1. A process for the production of a methylketone of a formula (1)
wherein x represents a number from 1-3, comprising: -
reacting hydrogen, acetone and an aldehyde of formula (2)
as reaction components;
wherein x represents a number from 0-2 and the broken lines each represent an olefinic double bond;
wherein said process is carried out as a 2-phase reaction and the reaction components are reacted in the presence of a catalyst suspension which contains a suspended heterogeneous hydrogenating contact and a dissolved, alkali- or earth alkali metal-containing aldolizing catalyst; and
wherein an aqueous phase of the catalyst suspension following phase separation of the aqueous phase from an organic phase, is used for a further reaction cycle at the end of the 2-phase reaction, wherein the catalyst suspension is a 2-phase mixture with acetone in the presence of hydrogen, and the aldehyde is continually dosed into it, and wherein the aldolizing catalyst is dissolved in the aqueous phase, which is also the suspension medium of the heterogeneous hydrogenating contact. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
wherein organic phase and catalyst suspension are brought into contact with each other in concurrent or counterflow; and
wherein, after phase separation, a product phase is separated off, while the catalyst suspension is recycled.
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Litigation Data
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Current AssigneeDegussa AG (Rag-Stiftung)
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Original AssigneeDegussa AG (Rag-Stiftung)
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InventorsKrill, Steffen
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Primary Examiner(s)Richter, Johann
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Assistant Examiner(s)Witherspoon, Sikarl A.
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Application NumberUS10/092,478Publication NumberTime in Patent Office473 DaysField of Search568/390, 568/392US Class Current568/390CPC Class CodesC07C 45/73 combined with hydrogenationC07C 49/04 Saturated compounds contain...Y02P 20/582 Recycling of unreacted star...
