Abstract
Palm fatty acid distillate is a processing by-product resulting from physical refining of crude palm oil products. Producing renewable fuels and biodegradable ester-based biolubricants using saturated palm fatty acid distillate (SFA) is one of environmentally friendly and an efficient way to reuse such by-product for the production of feasible high-end products. This study was carried out to synthesize and determine the optimal conditions for the esterification of Malaysian SFA with high degree polyhydric alcohols (trimethylolpropane, TMP; di-trimethylolpropane, Di-TMP; pentaerythritol, PE; and di-pentaerythritol, Di-PE) in the presence of sulfuric acid as catalyst. The esterification reaction parameters involved such as amount of catalyst, effect of reaction temperature (°C) and time (h), and effect of different alcohols, and molar ratio used was investigated. The results showed that the ester yield percentages varied with the corresponding reaction parameters and chemical structure of the alcohol used. The resultant esters with small-branched hydrocarbon chain alcohol produced the highest yield percentage for the SFA-TMP tri-ester (89 ± 3%) followed by the SFA-Di-TMP tetra-ester (87 ± 4%), SFA-PE tetra-ester (83 ± 5%), and SFA-Di-PE hexa-ester (77 ± 4%), respectively. The results showed the reaction temperature has more significant effect on the esterification reaction yield as compared to other parameters. The lubrication properties of the synthesized polyol esters indicated their appropriateness to be used as grease and bearing lubricant application.
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This project received funding from Universiti Kebangsaan Malaysia under the research grant no. GUP-2016–058 and Sime Darby Plantation Berhad through grant no. ST-2014–019.
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Majd Ahmed Jumaah: investigation and methodology. Firas Layth Khaleel: formal data analysis and data curation. Nadia Salih: visualization, writing—original draft, and writing—review and editing. Jumat Salimon: conceptualization, funding acquisition, resources, project administration, supervision, validation, and writing—review and editing.
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Jumaah, M.A., Khaleel, F.L., Salih, N. et al. Synthesis of tri, tetra, and hexa-palmitate polyol esters from Malaysian saturated palm fatty acid distillate for biolubricant production. Biomass Conv. Bioref. 14, 1919–1937 (2024). https://doi.org/10.1007/s13399-022-02517-x
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DOI: https://doi.org/10.1007/s13399-022-02517-x