Journal
RENEWABLE ENERGY
Volume 162, Issue -, Pages 1940-1951Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.10.001
Keywords
Musca domestica L.; Bio-lubricant; Trimethylolpropane fatty acid triester; Pour point; 2-Ethylhexyl fatty acid ester
Funding
- National Natural Science Foundation of China [31901603]
- International Program for Ph.D. Candidates, Sun Yat-Sen University, Guangdong Provincial Department of Science and Technology [2011B010700098]
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Lipid generated from housefly (Musca domestica L.) larvae fed by municipal waste is a renewable lipid resource, however, the low unsaturated degree prevents it from producing trimethylolpropane fatty acid triester as lubricant, due to its poor low-temperature performance. A new fatty acid esters complex consisting of trimethylolpropane fatty acid triester and 2-ethylhexyl fatty acid ester was produced from housefly larval lipid. Separated from molecular distillation, the acylglycerols were first trans-esterified into fatty acid methyl ester and then further trans-esterified with trimethylolpropane into trimethylol-propane esters. The purified trimethylolpropane fatty acid triester is with purity of 98.4% and further blended with 30 wt% 2-ethylhexyl fatty acid ester derived from housefly larval free fatty acid. The pour point was substantially lowered from -3 degrees C to -12 degrees C while the lubricity performance is within standard of ISO VG 32, with minor improvement of water separability compared with pure trimethylolpropane fatty acid triester. By blending two type bio-lubricants with different advantages on viscosity and pour point, the ester complex with favorable properties was produced using saturated non-food lipid source rather than unsaturated virginal vegetable oil. This study also offers a cleaner and energy-efficient approach for high value-added product production for non-food lipid industry. (C) 2020 Elsevier Ltd. All rights reserved.
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