APPARATUS AND METHOD FOR EXTRACTING ORGANIC COMPOUNDS FROM PLANT MATERIAL USING CARBON DIOXIDE

摘要

An apparatus for extracting organic compounds from plant materials using subcritical or supercritical carbon dioxide is described. The apparatus has a sealable pressure chamber into which carbon dioxide dry ice and the plant materials are inserted, the pressure chamber, once sealed, self-pressurizing as the container and contents are warmed to a chosen temperature, converting the solid CO2 to liquid, or to a super-critical fluid as the temperature and pressure are raised above the Critical Point. The chamber can be rotated when subcritical CO2 liquid is employed to improve mixing between the liquid and the plant material. After a suitable extraction time, the carbon dioxide solvent containing the extracted material is directed into a separator such that the carbon dioxide and extracted material can be effectively separated, thereby avoiding significant quantities of viscous and waxy extracted materials remaining in the chamber and valves after the carbon dioxide solvent is warmed and allowed to exit the chamber.

主权项

1. An apparatus for extracting organic compounds from plant material, comprising:
a first chamber capable of being pressurized having an opening for receiving solid carbon dioxide; a pressure lid for providing a gas-tight seal for the opening, and for maintaining a chosen pressure within the chamber; a first heating element adapted for heating the first chamber; a temperature sensor; a pressure sensor; a porous container adapted to be placed in the first chamber for holding the plant material and for permitting the plant material to be contacted by liquid carbon dioxide or supercritical carbon dioxide; a valve for permitting liquid carbon dioxide or supercritical carbon dioxide containing extracted organic compounds to exit the first chamber; and a separator for receiving liquid carbon dioxide or supercritical carbon dioxide containing extracted organic compounds exiting from the first chamber through said valve, and for separating the extracted organic compounds from the liquid carbon dioxide or supercritical carbon dioxide.