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- Recovering value from organic waste materials: Supercritical fluid extraction of oil from industrial grape seedsPublication . Coelho, Jose; Filipe, Rui; Robalo, Maria Paula; Stateva, Roumiana P.Supercritical extraction of oil from grape seed samples obtained from a Portuguese industry was carried out at temperatures from (313-333) K, pressures up to 40.0 MPa and different scCO(2) flow rates. The qualitative analysis of the crude oil was carried out by NMR. The fatty acids were analyzed by GC-Fid with reference to the parameters in Annex I to European Commission Regulation. The results show similar content of TAGs and DAGs both in the n-hexane and scCO(2) extraction methods, but the latter have higher PUPA and lower saturated fatty acids content. A dynamic model was used to simulate the extraction curves in gPROMS ModelBuilder. The grape seed oil was represented as either a one or a three component mixture of triacylglycerols, and the deviation between the experimental and calculated extraction yields was in the range (2-9) % for the first, and (4-11) % for the second case.
- Application of a novel approach to modelling the supercritical extraction kinetics of oil from two sets of chia seedsPublication . Villanueva Bermejo, David; Fornari, Tiziana; Calvo, Maria V.; FONTECHA, JAVIER; Coelho, Jose; Filipe, Rui; Stateva, Roumiana P.The kinetics of the supercritical fluid extraction of edible and discarded chia seeds was studied and modelled for the first time. The total oil was removed at 45 MPa and 60 degrees C after 240 min. The extraction kinetics was simulated using a dynamic model in gPROMS ModelBuilder environment and the kinetic parameters estimated. Triolein was chosen as a model compound of the chia oil. The agreement between the experimental yields and those calculated by the model was good with deviations in the range (1.2-6.6) %, except at 25 MPa and 60 degrees C (AARD = 9.5%). (C) 2019 The Korean Society of Industrial and Engineering Chemistry.