Method for the enhanced recovery of catmint oil
AssigneeE.I.Du Pont De Nemours and Company
InventorsMark A. Scialdone, David L. Hallahan
Life of this patent
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Abstract
A high yielding method is described for recovery of catmint oil from catmint plants of the genus Nepeta by improved separation of a catmint oil containing phase from the condensed steam distillate of catmint plants. Catmint oil may be obtained in quantitative yields for use in insect repellent compositions.
Claims10
A method for recovering catmint oil from plants of the genus Nepeta, comprising
- (a) contacting Nepeta plant material with steam to form a volatilized mixture comprising catmint oil and water;
- (b) condensing the volatilized mixture to form a first liquid mixture comprising catmint oil and water;
- (c) contacting the first liquid mixture with at least one non-water miscible organic extracting solvent to form a second liquid mixture that contains a solvent phase and an aqueous phase;
- (d) in the second liquid mixture, separating the solvent phase from the aqueous phase, and recovering the solvent phase;
- and
- (e) removing the extracting solvent from the solvent phase to isolate the catmint oil.
A method for recovering catmint oil from plants of the genus Nepeta, comprising
- (a) contacting Nepeta plant material with steam to form a volatilized mixture comprising catmint oil and water;
- (b) condensing the volatilized mixture to form a first liquid mixture comprising catmint oil and water;
- (c) in the first liquid mixture, separating catmint oil from water, and recovering the catmint oil;
- (d) contacting the catmint oil recovered in (c) with at least one non-water miscible extracting solvent to form a second liquid mixture that contains a solvent phase and an aqueous phase;
- (e) in the second liquid mixture, separating the solvent phase from the aqueous phase, and recovering the solvent phase;
- and
- (f) removing the extracting solvent from the solvent phase to isolate the catmint oil.
A method for recovering catmint oil from plants of the genus Nepeta, comprising
- (a) providing a first liquid mixture comprising catmint oil and water;
- (b) contacting the first liquid mixture with at least one non-water miscible organic extracting solvent to form a second liquid mixture that contains a solvent phase and an aqueous phase;
- (c) in the second liquid mixture, separating the solvent phase from the aqueous phase, and recovering the solvent phase;
- and
- (d) removing the extracting solvent from the solvent phase to isolate the catmint oil.
A method for recovering catmint oil from plants of the genus Nepeta, comprising
- (a) providing a first liquid mixture comprising catmint oil and water;
- (b) in the first liquid mixture, separating catmint oil from water, and recovering the catmint oil;
- (c) contacting the catmint oil recovered in (b) with at least one non-water miscible extracting solvent to form a second liquid mixture that contains a solvent phase and an aqueous phase;
- (d) in the second liquid mixture, separating the solvent phase from the aqueous phase, and recovering the solvent phase;
- and
- (e) removing the extracting solvent from the solvent phase to isolate the catmint oil.
Dependencies are inferred from the claim text.