10.5071/18THEUBCE2010-OB10.5
Evon, P.
P.
Evon
Vandenbossche, V.
V.
Vandenbossche
Pontalier, P.Y.
P.Y.
Pontalier
Rigal, L.
L.
Rigal
The Twin-Screw Extrusion Technology, an Original and Powerful Solution for the Biorefinery of Sunflower Whole Plant
ETA-Florence Renewable Energies
2010
Conference paper
Biomass
2010
en
978-88-89407-56-1
9 Pages
application/pdf
Proceedings of the 18th European Biomass Conference and Exhibition, 3-7 May 2010, pp. 1481-1489
The objective of this study was to evaluate the feasibility of an aqueous process for the biorefinery of sunflower whole plant using a twin-screw extruder. Aqueous extraction of oil was chosen as an environment-friendly alternative to the solvent extraction. The extruder was used to carry out three essential unit operations: grinding, liquid/solid extraction, and liquid/solid separation. Wringing out the mixing was effective. However, drying of the cake meal was not optimal. Lixiviation of cotyledon cells was also incomplete. Extraction efficiency depended on operating conditions: screw rotation speed, and input flow rates of whole plant and water. In the best conditions, oil yield was 57%. Residual oil content in the cake meal was 14%. These conditions leaded to the co-extraction of proteins, pectins, and hemicelluloses. The corresponding protein yield was 44%. Oil was extracted in the form of two oil-in-water emulsions. These hydrophobic phases were stabilized by phospholipids and proteins at interface. An aqueous extract containing part of the water-soluble constituents, mainly proteins and pectins, was also generated. As a mixture of fibers and proteins, the cake meal was molded by thermo-pressing. Panels produced had interesting mechanical properties in bending. The obtained fractions may have applications as bases for industrial products.
Proceedings of the 18th European Biomass Conference and Exhibition, 3-7 May 2010, Lyon, France, pp. 1481-1489