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High - pressure extraction of cork with CO2 and 1,4-dioxane

TitleHigh - pressure extraction of cork with CO2 and 1,4-dioxane
Publication TypeCase
Year of Publication1996
AuthorsMiranda, A. M., Machado A. S. Reis, Pereira H., & da Ponte M. Nunes
Secondary AuthorsProceedings, P. Rudolf von, & Technology C. Trepp B. T.
ReporterHigh Pressure Chemical Engineering Proceedings of the 3rd International Symposium on High Pressure Chemical Engineering
Reporter VolumeVolume 12
First Page417-422
CourtElsevier
ISBN Number0921-8610
Keywords1, 4-Dioxane, Cork, high-pressure extraction, suberin, supercritical CO2
Abstract

The extraction of cork from cork-oak (Quercus suber L.) by high-pressure dioxane and supercritical CO2 mixtures was studied at 170 bar and in the temperature range of 160°C - 180°C. Suberin is preferably extracted, but extraction percentages were lower than 46%. Lignin extraction percentages are lower than 11%. Extraction selectivity did not change significantly with extracting fluid composition. The results so far obtained support the idea of the existence of an extensive polymeric system across the cell wall and the concept of a close interaction of suberin and lignin, which hinders lignin depolymerization and solubilization in the high-pressure fluid. Fourier transform infrared spectra of cork, extraction residues and extracts are also presented.