TAILIEUCHUNG - Scientific, Health and Social Aspects of the Food Industry Part 17

Tham khảo tài liệu 'scientific, health and social aspects of the food industry part 17', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Quality Preservation and Cost Effectiveness in the Extraction of Nutraceutically-Relevant Fractions from Microbial and Vegetal Matrices 469 grape hyprose sunflower etc--see Reverchon and De Marco 2006 given that oilseed triglycerides solubilise well in SC-CO2 at 40 C and pressure higher than 280 bar. Main parameters of this process are particle size pressure and residence time. After extraction the extract solution is sent to a separator working at subcritical conditions so that the reduced solubility enables recovery of oil and elimination of gaseous CO2 from oil. Alternatively temperature variations may be used to recover the oil extracted in a process operated at a fixed pressure energy consumption can be reduced if thermal integration is properly deployed throughout the plant Reverchon and De Marco 2006 . While several seed oils have been extracted this way up to the pilot scale here we take sunflower oil as an example. The main models of SFE from vegetal matrices are derived from classical models of mass transfer and extraction kinetics. Several models were already published they mostly assume plug flow of the fluid through the fixed bed of the solid matrix and mass transfer control located in the fluid phase as done by Lee et al. 1986 in the solid phase . Reverchon 1986 or in both . Sovová et al. 1994 . Most of them consider only one pseudocomponent the solute characterised by one averaged solubility value obtained experimentally. The solid matrix of the seeds is porous homogeneous and with constant physical properties during extraction. The physical properties of the fluid are constant as well. Usually pressure and temperature gradients that appear in the fixed bed are neglected. Perrut et al. 1997 considered one solid phase and one fluid phase where external mass transfer is the controlling step. Axial dispersion in the bed is neglected and all pores are pre-filled by the solvent during the initial increase of pressure in the extractor until .

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