Abstract
The influence of particle size and solvent flow rate on the kinetics of oil extraction from soybean (eight fractions from 0.433 to 0.122 mm) was studied using hexane, simulating commercial percolation type extractor. The reduction in particle size from 0.433 mm to 0.141 mm showed an increase in the oil yield. However, further reduction to 0.129 mm and 0.122 mm affected the yield due to bed compaction, reducing porosity and contact area. The yield (21.5%) of the ground mass was similar to the major mass fractions (0.239–0.353 mm). The rate of extraction increased drastically with the solvent flow rate. The highest flow rate (9.67 mL/min) exhibited the highest mass transfer coefficient (km) 1.62 × 10–3 s−1 and the diffusion coefficient (De) 1.77 × 10–12 m2/s. At 7.33 mL/min, the yield and the rate of extraction were optimal and no potential benefits were obtained at higher flow rates.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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Abbreviations
- a:
-
Radius of equivalent sphere (m)
- De :
-
Effective diffusion coefficient (m2/s)
- \({\overline{D} }_{s}\) :
-
Volume surface mean diameter (m)
- km :
-
Mass transfer coefficient (s−1)
- M0 :
-
Average initial oil content at time t = t0 (g/g)
- Mt :
-
Average residual oil content at time t = t (g/g)
- M∞ :
-
Equilibrium residual oil content at time t = t∞ (g/g)
- t:
-
Time (s)
- x1 :
-
Mass fraction in a given sieve
- AOCS:
-
American Oil Chemists’ Society
- FFA:
-
Free fatty acids
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Acknowledgements
Deepali D Shejawale thanks, UGC New Delhi, India, for the award of RGNF. The authors thank Ministry of Food Processing Industries, New Delhi, India for project grant and Gopika S Kumar for her help in preparing the manuscript.
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The work was funded by Ministry of Food Processing Industries, New Delhi, India.
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DDS conceived, carried out the work and wrote the manuscript. CSM carried out the mathematical modelling and provided support for manuscript preparation. NKR supervised the mathematical modelling part and edited the manuscript. RS conceived and supervised the work, and edited the manuscript.
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Shejawale, D.D., Murugesh, C.S., Rastogi, N.K. et al. Effect of feed particle size and solvent flow rate on soybean oil extraction in a percolation type extractor. J Food Sci Technol 59, 4723–4730 (2022). https://doi.org/10.1007/s13197-022-05554-6
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DOI: https://doi.org/10.1007/s13197-022-05554-6