Thumba (Citrullus colocynthis L.) seed oil: a potential bio-lubricant base-stock

Authors

  • K. Kamalakar Centre for Lipid Research, CSIR- Indian Institute of Chemical Technology
  • G. N.V.T. Sai Manoj Centre for Lipid Research, CSIR- Indian Institute of Chemical Technology
  • R. B.N. Prasad Centre for Lipid Research, CSIR- Indian Institute of Chemical Technology
  • M. S.L. Karuna Centre for Lipid Research, CSIR- Indian Institute of Chemical Technology

DOI:

https://doi.org/10.3989/gya.0576141

Keywords:

Epoxidation, Lubricant properties, Polyols, Thumba seed oil

Abstract


Thumba seed oil, a minor, renewable tree borne oil, was exploited for the preparation of biolubricant base-stocks. The different base-stocks prepared were epoxy thumba oil (ETO), branched, 2-ethylhexyl ester (T2-EtHE), and polyol esters, namely, neopentyl glycol (TNPGE), trimethylolpropane (TTMPE) and pentaerythritol (TPEE) esters of thumba fatty acids. All the base-stocks were thoroughly characterized using spectral techniques. When evaluated for lubricant properties, ETO showed much higher viscosity (216.9 cSt), good oxidative stability (RBOT Method, ASTM D 2272) (20 min) and weld load (ASTM IP 239) (180 kg) behavior when compared to the branched and polyol esters. Polyol esters, T2-EtHE, TNPGE and TTMPE (−9 to −18 °C) showed low pour points compared to ETO and TPEE. The thermal stabilities (Thermo gravimetric analysis, TGA) of ETO and TPEE (425 °C) were higher compared to other base-stocks. The lubricant properties of ETO matched well with ISO VG 220 and Aviation Grade 100 lubricant specifications, while polyol esters can be well exploited for hydraulic and metal working fluid applications.

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Published

2015-03-30

How to Cite

1.
Kamalakar K, Sai Manoj GN, Prasad RB, Karuna MS. Thumba (Citrullus colocynthis L.) seed oil: a potential bio-lubricant base-stock. grasasaceites [Internet]. 2015Mar.30 [cited 2021Dec.5];66(1):e055. Available from: https://grasasyaceites.revistas.csic.es/index.php/grasasyaceites/article/view/1520

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