During the extraction, a continuous flow of CO2 (3000 mL/h)
was introduced into the column, through the bottom. When the
operating pressure and temperature were reached, the liquid
sample was pumped at the selected flow rate (300 mL/h) during
the entire extraction time (90 min). The liquid sample introduction
was carried out through the middle point of the packed
column (see Fig. 5), located over the inlet of the CO2, creating a
countercurrent flow between the liquid sample (downward) and
the SC-CO2 (upward). When the extraction was finished CO2
was pumped for another 30 min.