Brazilian Journal of Chemical Engineering
On-line version ISSN 0104-6632
PAVIANI, L.; PERGHER, S. B.C. and DARIVA, C.. Application of molecular sieves in the fractionation of lemongrass oil from high-pressure carbon dioxide extraction. Braz. J. Chem. Eng. [online]. 2006, vol.23, n.2, pp. 219-225. ISSN 0104-6632. http://dx.doi.org/10.1590/S0104-66322006000200009.
The aim of this work was to study the feasibility of simultaneous process of high-pressure extraction and fractionation of lemongrass essential oil using molecular sieves. For this purpose, a high-pressure laboratory-scale extraction unit coupled with a column with four different stationary phases for fractionation: ZSM5 zeolite, MCM-41 mesoporous material, alumina and silica was employed. Additionally, the effect of carbon dioxide extraction variables on the global yield and chemical composition of the essential oil was also studied in a temperature range of 293 to 313 K and a pressure range of 100 to 200 bar. The volatile organic compounds of the extracts were identified by a gas chromatograph coupled with a mass spectrometer detector (GC/MS). The results indicated that the extraction process variables and the stationary phase exerted an effect on both the extraction yield and the chemical composition of the extracts.
Keywords : High-pressure CO2 extraction; Lemongrass; Molecular sieves; Fractionation.