The aqueous extraction of sunflower oil from whole plant in twin-screw extruder, a first step for the manufacturing of biodegradable agromaterials by thermo-pressing

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Evon, Philippe and Vandenbossche, Virginie and Pontalier, Pierre-Yves and Rigal, Luc The aqueous extraction of sunflower oil from whole plant in

twin-screw extruder, a first step for the manufacturing of biodegradable agromaterials by thermo-pressing. (2011) In: World Conference on Oilseed

Processing, Fats & Oils Processing, Biofuels & Applications, 21 June 2011 - 23 June 2011 (Izmir, Turkey). (Unpublished)

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

- Topic: “By-products and utilization”.

The aqueous extraction of sunflower oil from whole plant

in twin-screw extruder, a first step for the manufacturing

of biodegradable agromaterials by thermo-pressing

Ph. Evon*, 1, 2, V. Vandenbossche1, 2, P.Y. Pontalier1, 2, L. Rigal1, 2

1

Université de Toulouse; INP; LCA (Laboratoire de Chimie Agro-industrielle); ENSIACET, 4 Allée Emile Monso, 31030 Toulouse Cedex 4, France

2

INRA; LCA (Laboratoire de Chimie Agro-industrielle); 31030 Toulouse Cedex 4, France

Keywords: Sunflower whole plant, twin-screw extruder, aqueous extraction process, oil and

extraction, proteins and extraction, thermo-pressing, biodegradable agromaterials.

Twin-screw extrusion is an original solution for the biorefinery of sunflower whole plant according to an aqueous extraction process. In best operating conditions, oil yield is 57% and residual oil content in the cake meal is 14%. Oil is extracted in the form of two oil-in-water emulsions stabilized by phospholipids and proteins at interface.

The cake meal would be suitable for use in animal feeds and for energy production in pellets burning furnaces. As a mixture of fibers and proteins, it is also considered as a natural composite. It can be processed into biodegradable agromaterials by thermo-pressing.

During molding, part of residual oil is expressed (until 41% of oil from whole plant), leading to the increase of the total oil extraction yield (aqueous extraction in twin-screw extruder and expression during thermo-pressing): until 81% of oil from whole plant.

Panels have promising mechanical properties in bending (until 12MPa for stress at break). They are usable as inter-layer sheets for pallets, for their sound and heat insulation properties or for the manufacturing of containers by assembly of panels. Their hydrophobic character (8% for residual oil content in the panels) makes them resistant to water.

__________

* Corresponding author. Tel.: + 33 (0)5 62 44 60 80; fax: + 33 (0)5 62 44 60 82. E-mail address: Philippe.Evon@ensiacet.fr (Ph. Evon).

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