Modelling of supercritical carbon dioxide extraction of canola oilseed in fixed beds

Abstract

Supercritical carbon dioxide extraction of oil from fixed beds (4.8 mm, 24.5 and 12.7 mm I.D.) of crushed canola seeds is described. Experiments were performed to obtain equilibrium data and extraction rates at 55 C, 36 MPa using solvent velocities ranging from 0.04 to 2.8 mm/s. A one‐dimensional, unsteady state mathematical model was used to obtain the oil concentration profiles in both the solvent and solid phases, and to determine the overall volumetric mass transfer coefficients. The calculated concentrations and extraction rates are in good agreement with experimental results. The overall volumetric mass transfer coefficient for the initial, constant rate extraction was correlated with interstitial velocity.

Influence of extraction conditions on antioxidant properties of passion fruit (Passiflora edulis) peel

“…Longer extraction time might increase the oxidation of phenolic compounds, thus contributing to lower DPPH radical scavenging activity [Naczk and Shahidi 2006]. The use of different extraction times to extract phenolic compounds may be due to the varying degrees of phenolic polymerization, solubility of phenolics and interaction between phenolic compounds and sample extract [Silva et al 2007], where the fi nal equilibrium between solvent and solid diffusion was attained exactly at an optimum extraction point [Lee et al 1986]. After considering the cost of extraction time and its practicality based on the high scavenging activity, the best extraction time for extraction of antioxidants in the passion fruit peels was 60 min.…”

Extraction of safflower seed oil by supercritical CO2

“…There is a change in equilibrium relationship in inlet part of extraction region and the extraction is under mass transfer controlled. When all of the easily accessible oil has been removed, the rate of extraction depends on diffusion of oil from the interior to the surface of the seed particles, the extraction falls into slow extraction period (Lee et al, 1986).…”

Supercritical carbon dioxide extraction of cottonseed oil

“…A lot of work published on SFE in the food processing industry has dealt with extraction of vegetable oils (Bulley, Fattori, Meisen, & Moyls, 1984;Christianson et al, 1984;Dakovic, Turkulov, & Dimic, 1989;Hierro & Santa-Maria, 1992;Lee, Bulley, Fattori, & Meisen, 1986;List, Friedrich, & Pominski, 1984;Stahl, Schü ltz, & Mangold, 1980;Taniguchi, Tsuji, Shibata, & Kobayashi, 1985). Supercritical carbon dioxide (SC-CO 2 ) has been established as a good alternative solvent for several lipid processing operations such as separation of FFA from vegetable oils, separation of polyunsaturated fatty acids (PUFA) from animal lipids, refining and deodorization of vegetable oil, fractionation of glycerides, recovery of oil from oil bearing materials, deoiling of lecithin and decholesterolization and delipidation of food products (Mukhopadhyay, 2000).…”