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    Rights statement: This is the peer reviewed version of the following article: Umar, Y., Aboelazayem, O., Gadalla, M.A. and Saha, B. (2022), Enhanced biodiesel production with improved oxidation stability by water addition to supercritical methanolysis. Can J Chem Eng. Accepted Author Manuscript.. doi:10.1002/cjce.24475 which has been published in final form at https://onlinelibrary.wiley.com/doi/10.1002/cjce.24475 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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Enhanced biodiesel production with improved oxidation stability by water addition to supercritical methanolysis

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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  • Yusuf Umar
  • Omar Aboelazayem
  • Mamdouh Gadalla
  • Basu Saha
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<mark>Journal publication date</mark>30/09/2022
<mark>Journal</mark>The Canadian Journal of Chemical Engineering (Wiley InterScience Publishers)
Issue number9
Volume100
Number of pages21
Pages (from-to)2587-2607
Publication StatusPublished
Early online date30/05/22
<mark>Original language</mark>English

Abstract

Biodiesel has been established as a potential alternative fuel for petroleum diesel. However, one of the main uncertainties about biodiesel is its susceptibility to oxidation. In the present study, biodiesel has been synthesized from high acid value waste cooking oil (WCO) using supercritical methanolysis. The influence of supercritical reaction conditions on enhancing biodiesel's oxidation stability and yield has been extensively studied. Five independent reaction variables have been investigated, including methanol to oil (M:O) molar ratio (3-40), temperature (235-275°C), pressure (65-145 bar), time (5-30 min), and water content (0-8 vol%). The oxidation stability has been analyzed via PetroOxy commercial device based on the ASTM D7545-14 methods and compared to EN14214 standards. Response Surface Methodology (RSM) via Central Composite Design (CCD) has been employed to evaluate the influence of the process variables and to develop empirical models representing the reaction. Interestingly, it has been observed that water content in the feedstock would be an advantage to increase both yield and oxidation stability of biodiesel. Analysis of variance (ANOVA) has been used to investigate the adequacy of the predicted model at a 95% confidence level. The developed optimum conditions have achieved a yield of 99.8% and 26.21 min (oxidation stability) at 10:1 M:O molar ratio at 245°C, 125 bar, 6 vol% water content within 16.7 min reaction time. The predicted optimal conditions have been validated experimentally with 0.8-0.9% relative error for both responses.

Bibliographic note

This is the peer reviewed version of the following article: Umar, Y., Aboelazayem, O., Gadalla, M.A. and Saha, B. (2022), Enhanced biodiesel production with improved oxidation stability by water addition to supercritical methanolysis. Can J Chem Eng. Accepted Author Manuscript.. doi:10.1002/cjce.24475 which has been published in final form at https://onlinelibrary.wiley.com/doi/10.1002/cjce.24475 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.