Aqueous extraction of residual oil from sunflower press cake using a twin-screw extruder: Feasibility study - Archive ouverte HAL Access content directly
Journal Articles Industrial Crops and Products Year : 2009

Aqueous extraction of residual oil from sunflower press cake using a twin-screw extruder: Feasibility study

Philippe Evon
Virginie Vandenbossche
  • Function : Author
  • PersonId : 1202986
Pierre-Yves Pontalier

Abstract

The objective of this study was to evaluate the feasibility of an aqueous process to extract the residual oil from sunflower press cakes using a co-rotating twin-screw extruder. Two different configurations were tested: the expression from whole seeds followed by the aqueous extraction, in two successive apparatus or in the same one. For the aqueous extraction stage, the oil yield depended on the operating conditions including screw rotation speed, screw profile, and inlet flow rates of press cakes and water. Liquid/solid separation required the addition of a lignocellulosic residue (wheat straw), upstream from the filtration zone. However, even with maximum fiber inlet flow (around 20% of the inlet flow rate of the solid matters for the highest amount of wheat straw), drying of the cake meal did not improve. The lixiviation of the material was also incomplete. Oil yield was better when the expression and the aqueous extraction were conducted in the same extruder. For all the trials carried out using such a configuration, the corresponding cake meal contained less than 10% residual oil, and the total oil yield was 78% in the best operating conditions. Nevertheless, the contribution of the aqueous extraction stage was extremely limited, less than 5% in the best trial, partly due to a ratio of the water to the press cake too low. For the aqueous extraction stage, the oil was extracted in the form of an oil-in-water emulsion whose stability was minimized because of its low proteins content due to their thermomechanical denaturation during the expression stage.
Fichier principal
Vignette du fichier
Evon_3520.pdf (404.01 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00726829 , version 1 (31-08-2012)

Identifiers

Cite

Philippe Evon, Virginie Vandenbossche, Pierre-Yves Pontalier, Luc Rigal. Aqueous extraction of residual oil from sunflower press cake using a twin-screw extruder: Feasibility study. Industrial Crops and Products, 2009, vol. 2 (2-3), pp.455-465. ⟨10.1016/j.indcrop.2008.09.001⟩. ⟨hal-00726829⟩
110 View
566 Download

Altmetric

Share

Gmail Facebook X LinkedIn More