Journal
JOURNAL OF CLEANER PRODUCTION
Volume 360, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.131905
Keywords
Electrostatic field; Canola oil; Refining; Contaminants; Triglyceride structure; Oil loss
Categories
Funding
- Saskatchewan Ministry of Agriculture [20180253]
- China Scholarship Council [201708420163]
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Traditional vegetable oil refining methods are inefficient and lead to oil loss, while using an electrostatic oil cleaner can improve oil quality. This study found that applying an electric field can reduce contaminants in crude canola oil without significantly affecting its nutritional composition, and with minimal oil loss.
Traditional vegetable oil refining strategies are energy-intensive and can result in substantial oil loss. In metalworking and machine shops, electrostatic `oil cleaners are used to remove particulate matter (e.g., wear particles, soot, vanish, and dust) from non-polar working fluids with low dielectric constants (e.g., lubricating oil and hydraulic oil). Vegetable oils are also non-polar fluids. Polar contaminants (e.g., phospholipids, free fatty acids, peroxides) can be present in unrefined vegetable oils. The effects of electrostatic field (E-field) applied using a commercial electrostatic `oil cleaner on crude canola oils were studied. E-field treatments of crude canola oils reduced suspended particles and the contents of phospholipids (reduction of 74.9%), free fatty acids (reduction of 53.2%), and peroxides (reduction of 47.0%). These treatments did not significantly alter either carotenoid content or fatty acid composition. Furthermore, oil loss was negligible (0.37%) during E-field treatment. Therefore, E-field can provide an economical, sustainable, and environmentally friendly alternative to conventional refining methods with minimal oil loss.
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