Steam distilling is great, but in this case it is leaving an off putting smell and taste in the desired end product. Are there any other methods to distill the volatile oils without direct solvent extraction of the plant? We do not want to use solvent directly on the plant because it will pick up other compounds that we cannot have in our end product.
You can perform the distillation using some reagents for making the undesired compounds not to vaporize. An example is the hydro distillation of tobacco essential oil by using H2SO4 to bind the nicotine.
It depends on your plant. For example, for the Summer Savory essential oil, method of water distillation is great .
Supercritical fluid extraction is the most effective and efficient way to extract valuable constituent botanicals. Supercritical Fluid Extraction (SFE) is the process of separating one component (the extractant) from another (the matrix) using supercritical fluids that is CO2 as the extracting solvent. CO2 is the king of extraction solvents for botanicals. Extraction conditions for supercritical CO2 are above the critical temperature of 31°C and critical pressure of 74 bar. Supercritical fluids are highly compressed gases, which have combined properties of gases and liquids in an intriguing manner. Supercritical fluids can lead to reactions, which are difficult or even impossible to achieve in conventional solvents. It is a fast process completed in 10 to 60 minutes.
Не забудте про анфлераж - самый легкий и провереный метод. Но конечно надо попробовать несколько адсорбентов.
Microwave dry distillation is more convenient
see the link below
http://www.univ-tebessa.dz/fichiers/usthb/Tigrine2eme%20Article%202006.pdf
Microwave extraction is the best without solvent nor water nor organic solvant !
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