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The use of hypercritical carbon dioxide extraction is a fairly new way to extract essential oils from botanical material and although a bit on the expensive side, does yield good quality oils.
Carbon dioxide becomes hypercritical at 33 degrees Celsius, which is a state in which it is not really gas or liquid, but has qualities of both, and is an excellent solvent to use in the extraction of essential oils since the low temperature required and the fact that the process is near to instantaneous.
The carbon dioxide is furthermore inert and therefore does not chemically interact with the essence that is being extracted. To remove the carbon dioxide solvent, you simply need to remove the pressure under which it is kept.
This process has to take place in a closed chamber for the hypercritical pressure required for carbon dioxide is 200 atmospheres - that is 200 times the pressure of normal atmosphere.
To achieve this type of pressure some heavy-duty stainless steel equipment is required, and this is where high capital investment is required for this extraction method.
To view further information on extraction methods in essential oil manufacture, please visit the following links
Other information 
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