Yes you can extract essential oil by using clevenger apparatus using water as a solvent. it is also called hydrodistillation method.
clevenger apparatus is the best to obtain good yeild of essential oil
see the following article
Yes you can extract essential oil by using clevenger apparatus using water as a solvent. it is also called hydrodistillation method.
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If you are looking for laboratory quantification, you can do it through hydro-distillation in a clevenger apparatus. If you have the facilities, you can also use supercritical carbon dioxide extraction method for extracting essential oil.
Steam distillation Steam is possible for large scale production; however, steam distillation is an expensive method of extracting the blue oil from German chamomile due to the heavy steel equipment required to withstand high pressures due to super heated steam. The use of combined SE-CD is less expensive than steam distillation and also avoids the problem flowers compacting together in the standard clavenger method.
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http://chemistry.uonbi.ac.ke/node/1696
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