Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
  • C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
  • C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
  • C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
  • C07C45/72—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups
  • C07C45/74—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms by reaction of compounds containing >C = O groups with the same or other compounds containing >C = O groups combined with dehydration
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
  • C07C45/78—Separation; Purification; Stabilisation; Use of additives
  • C07C45/81—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
  • C07C45/82—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation

Definitions

• TITLE A PROCESS FOR PREPARATION OF UNSATURATED KETONE
• the invention relates to a process for preparation of an unsaturated ketone compound.
• Unsaturated ketones have numerous applications in organic chemistry. They are generally used as additives during the manufacture of perfumes. Various methods are available in the art for the preparation of unsaturated ketones.
• unsaturated ketones are prepared by aldol condensation of aldehydes with ketone using sulfuric acid as a catalyst.
• this process produces huge amount of toxic wastes so that large amount of effluent treatment is required which results in increase in cost of manufacturing.
• the yield of the final product the unsaturated ketone is less.
• ⁇ 10 ⁇ 0922 ⁇ 1- Provides for a process of preparing unsaturated ketones by reacting the corresponding ⁇ , ⁇ -unsaturated alcohols with alkyl acetoacetates in the presence of from 0.1 to 5 mol%, based on the alkyl acetoacetate to be reacted, with an organic aluminum compound as catalyst with elimination and continuous removal by distillation of the carbon dioxide which forms during the reaction and of the alcohol which is eliminated from the acetoacetate in a reactor system with fitted fractionating column, wherein the ⁇ , ⁇ -unsaturated alcohol is introduced with less than 10% by weight of an inert solvent and with less than 0.5% by weight of a liquid which has a boiling point between that of the alkyl acetoacetate and that of the alcohol to be eliminated there from into the reaction vessel together with the organic aluminum compound, and the alkyl acetoacetate is metered into this mixture, a reaction temperature which is as constant as possible at between 175°C and 220°C is adjusted and during the reaction
• the present invention relates to a process for preparing unsaturated ketone compound using an ion exchange polymer as a catalyst.
• the process comprises the steps of mixing an aldehyde with ketone and passing the mixture of aldehyde and ketone through a fixed bed catalytic reactor comprising of the ion exchange polymer at a temperature of atleast 60 degree C at atmospheric pressure for a retention period of atleast 30 min.
• the unsaturated ketone obtained from the reaction is purified by distillation.
• the present invention provides a process for preparing unsaturated ketone using a catalyst.
• the process comprises the steps of mixing an aldehyde with ketone and passing the mixture of aldehyde and ketone through a fixed bed catalytic reactor comprising ion exchange polymer at a temperature of atleast 60 degree C at atmospheric pressure for a retention period of atleast 30 min.
• the unsaturated ketone obtained from the reaction is purified by distillation.
• the yield of the product is not less than 80% based on Ketone and not less than 75% based on aldehyde.
• the unsaturated ketone thus obtained is 99.5 % pure.
• the temperature is maintained above the room temperature.
• the range of the temperature is 60 - 90 degree C, preferably 70- 80 degree C and more preferably 75-78 degree c.
• the reaction is preferably carried out at atmospheric pressure.
• the predetermined retention period is about 30-50 min, preferably 40 min.
• the selectivity of the catalyst is about 80 mole % based on ketone- or is about 75 mole % based on aldehyde.
• the process further comprises the step of recovery of the unreacted aldehyde and ketone before purification of the unsaturated ketone obtained.
• the recovery step includes distillation of the reaction mixture of unreacted aldehyde, ketone and unsaturated ketone. The unreacted aldehyde and ketone are dried and recycled back to the reaction mixture.
• the process is continuous process.
• the process can be a batch or semi continuous process.
• the aldehyde is selected from acetaldehyde or butyraldehyde.
• the ketone is selected from methyl ethyl ketone or acetone.
• the catalyst is an ion exchange polymer.
• the ion exchange polymer is polystyrene sulphonated or carbonated cation resin wherein the resin is sulphonated or carbonated by sulphonic acid or carboxylic acid. More preferably, the ion exchange catalyst is polystyrene sulphonated cation resin.
• a preferred embodiment of the present invention relates to a process for preparation of 3-methyl-3-penten-2-one by using a polymer catalyst.
• the process comprises the steps of mixing acetaldehyde with methyl ethyl ketone and passing the solution of acetaldehyde and methyl ethyl ketone through a fixed bed catalytic reactor comprising of polystyrene sulphonated cation resin at an atmospheric pressure and at a temperature in the range of 60 -90 degrees C for 30-50 minutes to obtain 3-methyl-3- penten-2-one.
• the process is carried out in a continuous mode.
• the crude 3-methyl-3-penten-2-one thus obtained is purified by distillation and 99.5 % pure 3-methyl-3-penten-2-one is obtained.
• the unreacted acetaldehyde and methyl ethyl ketone were recovered by distillation.
• the recovered acetaldehyde and methyl ethyl ketone were dried and recycled into the reaction.
• the crude product thus obtained was 3-methyl-3-penten-2-one which was further purified by distillation and obtained around 520 gms of 99.5% pure 3-methyl-3-penten-2-one and the yield was 70%.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Crystallography & Structural Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

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Publications (2)

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• 2013
  • 2013-08-30 IN IN2838MU2013 patent/IN2013MU02838A/en unknown
• 2014
  • 2014-08-21 US US14/915,052 patent/US9670123B2/en active Active
  • 2014-08-21 WO PCT/IN2014/000538 patent/WO2015029059A2/en active Application Filing
  • 2014-08-21 ES ES14841272T patent/ES2771152T3/es active Active
  • 2014-08-21 EP EP14841272.9A patent/EP3039004B1/en active Active

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