Mathematical Modeling of Sunflower Seed Extraction by Supercritical CO₂

Abstract

Extraction of oil from crushed sunflower seeds with supercritical CO 2 was performed at 280 bar and 40 °C on a laboratory apparatus of 0.15 × 10 -3 m 3 volume and on a pilot plant of 1.5 × 10 -3 m 3 volume. CO 2 flow rate ranged between 5 and 45 kg h -1 . To study the influence of the vegetable matrix on the extraction rate, a re-extraction experiment on the extraction product was also performed on the pilot scale apparatus. A mathematical model of the supercritical extraction process was developed on the basis of the experimental evidence. The equilibrium between the solids and the fluid phase appeared to be the controlling step during the extraction process. A simplified form of a sigmoidal-shaped equilibrium curve was adopted to fit the experimental data in the whole range of CO 2 flow rates explored. The meaning of this nonlinear equilibrium relationship was also discussed.

Mathematical modeling of supercritical fluid extraction of oil from canola and sesame seeds

“…The experimental results were used to develop a model of the extraction process. Many researchers have considered the Henry isotherm because the Henry relation is simple and linear (Goto et al, 1996;Reverchon, 1997;Gooderznia and Ekani, 1998;Reverchon, 2001;Carvalho et al, 2012). Goto et al (1998) Ghoreishi et al (2001) employed the Freundlich isotherm for the modeling of supercritical extraction of mannitol from pane tree leaf.…”

Method development in inverse modeling applied to supercritical fluid extraction of lipids

“…Foo and Hameed [12]. Adsorption isotherms, usually linear, have only sparsely been considered in the modeling of SFE [13][14][15][16][17][18]. The expressions of adsorption isotherms may be used as partition isotherms [19], which may be more correct in cases where partition is occurring rather than adsorption.…”

“…6-9), the mass transfer inside the pores of the particle (Eqs. 10b, 12, 13b, [16][17] and also includes a solutesolid interaction inside the particle. As opposed to the EHBM the solubility and the partitioning of the solute is rather taken into consideration inside the particle.…”

“…11) whilst GRM does not since the solute is initially located in the solid matrix which is a different domain (Eqs. [16][17]. The initial solute concentration is based on the linseed density and the extractable amount which has previously been determined [28].…”

“…In either case the material is contained in an extraction vessel with frits on either side to ensure that the material is kept in place [1]. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] http://dx.doi.org/10.1016/j.supflu.2016.01. 006 2…”