Experimental apparatus and procedure for the extractions
The experiments were performed in a laboratory scale unit
consisting of a solvent reservoir, two thermostatic baths, a syringe
pump (ISCO 500D), a 100 cm3 jacketed extraction vessel, an absolute
pressure transducer (Smar, LD301) equipped with a portable
programmer (Smar, HT 201) with a precision of 0.12 bar, a collector
vessel with a glass tube, and a cold trap.
In each run, approximately 10 g of sample was charged into the