Volume 17, Number 6, November-Décembre 2010Dossier : Palmier à huile et développement durable
|Page(s)||404 - 417|
|Published online||15 November 2010|
La technologie d’extrusion bi-vis, une solution originale et performante pour le bioraffinage du tournesol plante entière
Université de Toulouse, INP, LCA (Laboratoire de chimie agro-industrielle), ENSIACET, 4, allée Émile-Monso, BP 44362, 31432 Toulouse Cedex 04, France
2 Inra, LCA (Laboratoire de chimie agro-industrielle), 31432 Toulouse Cedex 04, France
Accepté : 25 Octobre 2010
The objective of this study is to evaluate the feasibility of an aqueous process for the biorefinery of sunflower whole plant using a co-rotating twin-screw extruder. Traditionally, aqueous extraction of oil is looked upon as an environmentally cleaner alternative technology to the solvent extraction (Rosenthal et al., 1996) and the twin-screw extruder carries out three essential unit operations continuously: conditioning and grinding of whole plant, liquid/solid extraction and liquid/solid separation. Wringing out the mixing is favoured thanks to the stalk fibers. However, drying of the cake meal is not optimal and lixiviation of cotyledon cells within the seed is incomplete. Extraction efficiency depends on the operating conditions: screw rotation speed, input flow rates of whole plant and water. In best conditions, oil yield is 57% and residual oil content in the cake meal is 14%. These conditions lead to the co-extraction of proteins, pectins and hemicelluloses. Protein yield is 44% and residual protein content in the cake meal is 7%. Oil is extracted in the form of two oil-in-water emulsions stabilized by phospholipids and proteins at interface. An aqueous extract containing part of the water-soluble constituents from whole plant, mainly proteins and pectins, is also generated. As a mixture of fibers and proteins, the cake meal can be moulded by thermo-pressing. Panels have promising mechanical properties in bending.
Key words: sunflower whole plant / twin-screw extruder / aqueous extraction process / oil and extraction / proteins and extraction / thermo-pressing / biodegradable agromaterials
© John Libbey Eurotext 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.