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Epoxy Acyloxy Castor Polyol Esters: Multifunctional Base Oil for Aviation to Marine Formulations

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Abstract

With an intention to develop base oils with multi-functional properties, about 16 epoxy acyloxy castor polyol esters were prepared. Acyloxy castor polyols were prepared by the acylation of hydroxy functionality of castor fatty acids (acetylated, propionylated, butanoylated and hexanoylated) using kieselguhr-G method followed by reaction with polyols namely trimethylolpropane (TMP), neopentyl glycol (NPG), pentaerythritol (PE) and 2-ethyl hexanol (2-EtH) in 95–98% yields. Acyloxy castor polyol esters were epoxidized at the double bond to yield epoxy acyloxy castor polyol esters in 98–99% yields. The base stocks were characterized by 1H and 13C NMR, ESI–MS. When evaluated for base oil properties, exhibited high viscosity indices (86.27 to 427.01), very low pour points (–52 to –42°C) and high oxidative (30 to 50 min) and thermal (200 to 335°C) stabilities. These base stocks with good viscosity properties can withstand heavy loads, supported by low wear scar diameter. Overall the base stocks with superior properties can find applications right from aviation to marine engine formulations.

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ACKNOWLEDGMENTS

Authors would like to thank Director CSIR-IICT for the necessary laboratory facilities. IICT Communication Number: IICT/Pubs./2022/071.

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Authors and Affiliations

  1. Department of Organic Chemistry, Food, Drugs and water, Andhra University, 530003, Visakhapatnam, India

    Thirupathi Azmeera & Siddaiah Vidavalur

  2. Centre for Lipid Science & Technology, CSIR Indian Institute of Chemical Technology, 500007, Hyderabad, India

    Thirupathi Azmeera, Kamalakar Kotte & M. S. L. Karuna

  3. Department of Chemistry, Indian Institute of Technology (BHU) Varanasi, 221005, Varanasi, India

    Devarapaga Madhu

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  1. Thirupathi Azmeera
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  2. Kamalakar Kotte
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  3. Siddaiah Vidavalur
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  4. M. S. L. Karuna
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  5. Devarapaga Madhu
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Correspondence to M. S. L. Karuna or Devarapaga Madhu.

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Azmeera, T., Kotte, K., Vidavalur, S. et al. Epoxy Acyloxy Castor Polyol Esters: Multifunctional Base Oil for Aviation to Marine Formulations. Pet. Chem. 62, 1273–1282 (2022). https://doi.org/10.1134/S0965544122070210

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