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US 8,558,015 B2Granted
Solvent addition and removal in the hydrogenation of catmint oil
AssigneeE. I. Du Pont de Nemours and Company
InventorsJohn Charles Fisher, Keith W. Hutchenson, Scott Christopher Jackson, Leo Ernest Manzer, Mark A. Scialdone, Mayis Seapan
Life of this patent
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Abstract
Disclosed are methods for treating catmint oil. The treated catmint oil can be used for the production of hydrogenated catmint oil, which is enriched in the insect repellent, dihydronepetalactone, and from which formulated products may be prepared.
Claims10
A process for preparing hydrogenated catmint oil comprising:
- (a) distilling a beginning amount of crude catmint oil to produce (i) a distillate fraction comprising volatile components driven off from the beginning amount of crude catmint oil, and (ii) a pot fraction;
- and
- (b) contacting the pot fraction of step (a) with hydrogen and a hydrogenation catalyst to produce hydrogenated catmint oil;
- wherein one or both of steps (a) and (b) are conducted in the presence of a solvent;
- wherein the distillation of step (a) comprises a steam distillation followed by a solvent distillation;
- and
- wherein the beginning amount of crude catmint oil has at least about 150 ppm of sulfur-containing compounds, and the distillate fraction comprises at least about 8 wt % of the amount of sulfur-containing compounds in the beginning amount of crude catmint oil.
4 more elements
Dependencies are inferred from the claim text.