Title:
The Twin-Screw Extrusion Technology, an Original and Powerful Solution for the Biorefinery of Sunflower Whole Plant
Author(s):
Evon, P., Vandenbossche, V., Pontalier, P.Y., Rigal, L.
Document(s):
Paper
Abstract:
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.
Keywords:
biomaterial, biorefinery, emulsion, sunflower, aqueous extraction process, twin-screw extruder
Topic:
Biomass Chemistry
Subtopic:
Next-to-market applications
Event:
18th European Biomass Conference and Exhibition
Session:
OB10.5
Pages:
1481 - 1489
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-OB10.5
Price:
FREE
