Direct extraction of oil from sunflower seeds by twin-screw extruder according to an aqueous extraction process: Feasibility study and influence of operating conditions

Biorefinery of sunflower whole plant can be realized using a twin-screw extruder. Thermo-mechanical fractionation and aqueous extraction are conducted simultaneously. A filter section is outfitted along the barrel to collect continuously an extract and a raffinate (cake meal). Oil yield obtained is 53%. Proteins are partly extracted at the same time, just as pectins and hemicelluloses. Protein yield is 46%. Cake meal is relatively moist (66% for the moisture content). It is first dried to make easier its conservation. It is largely composed of lignocellulosic fibres (59% of the dry matter) from depithed stalk. Lipid content is 13% of the dry matter or 35% of the oil in whole plant. Protein content is 7% of the dry matter or 45% of the proteins in whole plant. DSC measurements indicate that denaturation of proteins is almost complete in the cake meal. DMTA spectrum of its milled powder reveals a significant peak at high temperature (between 175 and 200°C). As already observed with industrial sunflower cake meal, it can be associated with the glass transition of proteins. As a mixture of fibres and proteins, the cake meal can be considered as a natural composite. It is successfully processed into biodegradable and value-added agromaterials by thermo-pressing. As for DMTA analysis, the glass transition of proteins in the cake meal is also observed with PVT analysis at around 180°C. It makes easier the choice of the best thermo-pressing conditions to produce panels with higher mechanical properties in bending. These properties increase simultaneously with temperature, pressure and time chosen for molding operation. The highest flexural strength at break (11.5 MPa) and the highest elastic modulus (2.22 GPa) are obtained for the next molding conditions: 200°C and 320 kgf/cm2 during 60 s. Drop angle measurements show that the corresponding panel is also the most resistant to water. No significant transition is observed inside this panel above 0°C and until 200°C with DMTA analysis. Proteins ensure the agromaterial cohesion without any phase change in this temperature range, and fibres entanglement also acts like reinforcement. This panel could be used as inter-layer sheets for pallets or for the manufacturing of biodegradable containers (composters, crates for vegetable gardening) by assembly of panels.

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CFD Simulation of a Co-rotating Twin-screw Extruder: Validation of a Rheological Model for a Starch-Based Dough for Snack Food

International Journal of Food Engineering ◽

10.1515/ijfe-2017-0116 ◽

2017 ◽

Vol 14 (2) ◽

Cited By ~ 1

Author(s):

Giorgia Tagliavini ◽

Federico Solari ◽

Roberto Montanari

Keyword(s):

Cfd Simulation ◽

Fluid Dynamic ◽

Operating Conditions ◽

Second Phase ◽

Snack Food ◽

Suitable Model ◽

Twin Screw Extruder ◽

Parallel Plates ◽

Screw Extruder ◽

Twin Screw

AbstractThe extrusion of starch-based products has been a matter of interest, especially for the pasta and the snack food production. In recent years, twin-screw extruders for snack food have been studied from both structural and fluid dynamics viewpoints. This project started from the rheological characterization of a starch-based dough (corn 34 wt%, tapioca 32 wt%), comparing viscosity values acquired in laboratory with different theoretical models found in literature. A computational fluid dynamic (CFD) simulation recreating the simple case of a fluid flow between two parallel plates was carried out to validate the former comparison. After the rheological validation was completed, the second phase of this work covered a 3D CFD simulation of the first part of the twin-screw extruder (feeding zone). The objective was to find a suitable model for describing the dough rheological behavior and the operating conditions of a co-rotating intermeshing twin-screw extruder. Once the model would be defined, it would allow to investigate several working conditions and different screws geometries of the machine, predicting the evolution of the product rheological properties.

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Study of a novel co-rotating non-twin screw extruder in processing flame retardant polymer materials

Journal of Polymer Engineering ◽

10.1515/polyeng-2016-0235 ◽

2017 ◽

Vol 37 (8) ◽

pp. 827-835

Author(s):

Song Zhao ◽

Baiping Xu ◽

Liang He ◽

Huiwen Yu ◽

Shouzai Tan

Keyword(s):

Flame Retardant ◽

Mechanical Performance ◽

Acrylonitrile Butadiene Styrene ◽

Operating Conditions ◽

Polymer Materials ◽

Twin Screw Extruder ◽

Screw Extruder ◽

Limiting Oxygen Index ◽

Twin Screw ◽

Halogen Free

Abstract A thorough study was carried out to investigate the priority of a novel co-rotating non-twin screw extruder (NTSE) over a traditional twin screw extruder (TSE) in the mixing process of halogen-free intumescent flame-retardant acrylonitrile-butadiene-styrene (ABS) composites. The homogeneity of the flame-retardant additives of the composites processed by NTSE and TSE under the same operating conditions was characterized by using mechanical performance properties, limiting oxygen index values, UL-94 tests, and thermogravimetric analysis. All the results suggested that NTSE could achieve better mixing of the flame-retardant additives in the polymer matrix than TSE, which was further clarified by the scanning electron microscope pictures.

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Extraction of coriander oil by twin-screw extruder: Screw configuration and operating conditions effect

Industrial Crops and Products ◽

10.1016/j.indcrop.2012.03.034 ◽

2012 ◽

Vol 40 ◽

pp. 355-360 ◽

Cited By ~ 17

Author(s):

Jazia Sriti ◽

Kamel Msaada ◽

Thierry Talou ◽

Mamadou Faye ◽

Ika Amalia Kartika ◽

...

Keyword(s):

Operating Conditions ◽

Twin Screw Extruder ◽

Screw Extruder ◽

Extruder Screw ◽

Twin Screw

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EFFECT OF OPERATING CONDITIONS ON THE MIXING PERFORMANCE OF THE SCREW ELEMENT AND THE KNEADING BLOCK IN A TWIN-SCREW EXTRUDER

Journal of Polymer Engineering ◽

10.1515/polyeng.2007.27.3.183 ◽

2007 ◽

Vol 27 (3) ◽

Author(s):

Haibo Yang ◽

Yuqing Tong ◽

Ming Tian ◽

Liqun Zhang

Keyword(s):

Operating Conditions ◽

Twin Screw Extruder ◽

Screw Extruder ◽

Mixing Performance ◽

Twin Screw

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Steady and Transient Flow of a Non-Newtonian Chemically Reactive Fluid in a Twin-Screw Extruder

10.1115/imece2001/htd-24364 ◽

2001 ◽

Author(s):

W. Zhu ◽

Y. Jaluria

Keyword(s):

Steady State ◽

Response Time ◽

Transient Flow ◽

Transient Behavior ◽

Operating Conditions ◽

Twin Screw Extruder ◽

Screw Extruder ◽

Twin Screw ◽

Calculated Velocity ◽

Screw Extruders

Abstract The flow of chemically reactive non-Newtonian materials, such as bio-polymers and aciylates, in a fully intermeshing, co-rotating twin-screw extruder is numerically investigated. A detailed study of the system transient behavior is carried out. The main transient aspects, including response time, variation of system variables, and instability of operation, are studied for both single- and twin-screw extruders. The effect of a time-dependent variation in the boundary conditions is studied. The coupling due to conduction heat transfer in the screw barrel is found to be very important and is taken into account for single-screw extruders. In the absence of this conjugate coupling, the response time is much shorter. Several other interesting trends are obtained with respect to the dependence of the transient response on the fluid, materials, and operating conditions. Steady state results are obtained at large time. The calculated velocity distributions in the screw channel are compared with experimental results in the literature for steady state flow and good agreement has been obtained. The numerical results show that not all desired operating conditions are feasible. The calculated results for transient transport agree with the few experimental observations available on this system. These results will be useful in the design, control and optimization of polymer extrusion processes.

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