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Vol. 35 No. 8 (2023): Vol 35 Issue 8, 2023

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Synthesis and Evaluation of Jatropha Oil Branched Esters as Potential Fire Resistant Hydraulic Fluids

https://doi.org/10.14233/ajchem.2023.28065
Amit Kumar Rajak
Department of Oils, Lipid Science & Technology, CSIR–Indian Institute of Chemical Technology, Hyderabad-500007, India Department of Chemistry, Andhra University, Visakhapatnam-530003, India
https://orcid.org/0000-0002-6083-1434
Korlipara V. Padmaja
Department of Oils, Lipid Science & Technology, CSIR–Indian Institute of Chemical Technology, Hyderabad-500007, India
https://orcid.org/0000-0002-8014-2361
Siddaiah Vidavalur
Department of Chemistry, Andhra University, Visakhapatnam-530003, India
https://orcid.org/0000-0002-7190-7932
Mallampalli S.L. Karuna
Department of Oils, Lipid Science & Technology, CSIR–Indian Institute of Chemical Technology, Hyderabad-500007, India
https://orcid.org/0000-0002-4574-4471
Madhu Deverapaga
Department of Chemistry, Indian Institute of Technology (BHU) Varanasi, Varanasi-221005, India
https://orcid.org/0000-0002-6448-0619

Corresponding Author(s) : Madhu Deverapaga

deverapaga.rs.chy14@itbhu.ac.in

Asian Journal of Chemistry, Vol. 35 No. 8 (2023): Vol 35 Issue 8, 2023

Abstract

Jatropha oil (Jatropha curcas L.), a non-edible oil with oleic acid (45.7%) and linoleic acid (33%) as major components, was used to prepare basestocks for biolubricants. The hydrolyzed fatty acids underwent reaction with two iso-alcohols, 2-ethyl-1-hexanol (EH) and 3,5,5-trimethyl-1-hexanol (TMH) and 5 different polyols, namely neopentyl glycol (NPG), 2-methyl-2-propyl-1,3-propandiol (MPPD), trimethylolpropane (TMP), trimethylolethane (TME) and pentaerythritol (PE) at around 140 ºC in presence of catalyst p-toluenesulfonic acid (p-TSA) and xylene as solvent. The yields for the branched mono- and polyol esters ranged from 90% to 97.5%. The physico-chemical, lubricant and tribological properties of these esters as well as their 1H NMR, 13C NMR, IR and ESI-MS techniques were investigated. Among the products, polyol esters were found to possess good viscosity indices, good foam stability, higher thermal stability and higher flash and auto ignition points compared to branched mono esters. TMP and TME esters have matched the specifications of ISO VG 46 and PE esters match ISO VG 68 fire resistant hydraulic fluids, which are in high demand.

Keywords

Jatropha oil Polyol Biolubricant Environmentally friendly Fire resistant hydraulic fluids
Rajak, A. K., Padmaja, K. V., Vidavalur, S., Karuna, M. S., & Deverapaga, M. (2023). Synthesis and Evaluation of Jatropha Oil Branched Esters as Potential Fire Resistant Hydraulic Fluids. Asian Journal of Chemistry, 35(8), 1957–1962. https://doi.org/10.14233/ajchem.2023.28065
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