Extraction of plant material by using carbon dioxide

Details Extraction of plant material by using carbon dioxide Extraction of plant material by using carbon dioxide

1983-05-02

1985-11-19

Roberts, Elbert L.

Food or edible material: processes, compositions, and products

Products per se, or processes of preparing or treating...

Flavor or flavor adjunct, acidulant or condiment

4241951, A23L 1222, A61K 3578

Patent

active

045541701

ABSTRACT:
Plant material (for example, milled hop pellets) is placed in a pressure vessel and carbon dioxide is passed through the vessel in order to extract essential oil and resin components. Said passage is stopped after a predetermined period of time and inert gas(es) is/are used to displace said carbon dioxide and the extract(s) from said vessel to another location.
If liquid carbon dioxide is used, it is displaced to an evaporator in which the extract is deposited, carbon dioxide being gasified. If supercritical carbon dioxide is used, it is displaced to a separator.
Alternatively, the plant material may be steeped in liquid carbon dioxide which, after the steeping period, is displaced as aforesaid.
The gases (carbon dioxide and inert) may be vented to atmosphere or recovered for re-use.
Extraction using liquid carbon dioxide is isobaric whereas using supercritical carbon dioxide, the pressure in the pressure vessel is higher than in the separator.

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