Depression of pour points of vegetable oils by blending with diluents used for biodegradable lubricants

Asadauskas, Svajus; Erhan, Sevim Z.

doi:10.1007/s11746-999-0237-6

Cited by 156 publications

(96 citation statements)

References 14 publications

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“…However, the improvement reached with those additives is limited when the exposition to low temperatures is longer than that used in the laboratory test. other additives like synthetic diesters and polyol esters or oleates have typically been employed as diluents in biodegradable lubricants, and their effect on biodegrable lubricants has been extensively tested (Asadauskas and Erhan, 1999), reporting reductions in the pour points of vegetable oil basestocks to as low as -24°C.…”

Section: Pour Points and Viscositymentioning

confidence: 99%

Vegetable oil basestocks for lubricants

Garcés¹,

Martı́nez-Force²,

Salas³

2011

Grasas y Aceites

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Section: Pour Points and Viscositymentioning

confidence: 99%

Vegetable oil basestocks for lubricants

Garcés¹,

Martı́nez-Force²,

Salas³

2011

Grasas y Aceites

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“…The most common epoxidation process is carried out using peracetic or performic acid, with soluble mineral acids like sulphuric acid as catalyst. But traditionally employed low cost mineral acids often hinder the achievement of high yields owing to the oxirane ring opening leading to deleterious consecutive reactions (Rangarajan et al, 1995;Asadauskas and Erhan, 1999;Petrovic et al, 2002). The environmental concerns related to the disposal of salts during the neutralization of mineral acids and the technical problems associated with their use such as corrosion and separation constitute a strong driving force in searching for alternatives to this technology.…”

Section: Introductionmentioning

confidence: 99%

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

Kamalakar¹,

Manoj²,

Prasad³

et al. 2015

Grasas y Aceites

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SUMMARY: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. KEYWORDS:Epoxidation; Lubricant properties; Polyols; Thumba seed oil RESUMEN: Aceites de semillas de thumba (Citrullus colocynthis L.): una reserva potencial para biolubricantes. Las semillas de thumba producen un aceite de escasa importancia que ha sido explotado como base para la preparación de biolubricantes. Los diferentes derivados de thumba preparados fueron: éteres epoxi (ETO), éteres ramificados, éster de 2-etilhexilo (T2-ETHE), y los ésteres de poliol:, neopentil glicol (TNPGE), trimetilolpropano (TTMPE) y pentaeritritol (TPEE). Todas las bases se caracterizaron en su totalidad utilizando técnicas espectrales. Cuando se evaluaron las propiedades del lubricante, ETO mostró una viscosidad mucho más alta (216,9 cSt), buena estabilidad a la oxidación (RBOT Método, ASTM D 2272) (20 min) y buena carga (239 ASTM IP) (180 kg) en comparación con el comportamiento de los ésteres de poliol y los ramificados. Los ésteres de poliol, T2-EEl, TNPGE y TTMPE (−9 a −18 °C) mostraron bajos puntos de fluidez en comparación con ETO y TPE. Las estabilidades térmicas (análisis termogravimétrico, TGA) de ETO y TPE (425 °C) fueron más altos en comparación con las otras bases. Las propiedades lubricantes de ETO coinciden bien con las especificaciones de los lubricantes, ISO VG 220 y Grado Aeronautica 100, mientras que los ésteres de poliol pueden aprovecharse bien para aplicaciones en fluidos hidráulicos y trabajos de metal.

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“…For many reactions, unsaturated double bonds in the fatty acids act as active sites. There are two major problems associated with vegetable oils as functional fluids offer low resistance to thermal oxidative stability (9,(22)(23)(24)(25)(26)(27)(28)(29)(30) and poor low-temperature properties (24,25,29,(31)(32)(33)(34).…”

Section: Introductionmentioning

confidence: 99%

Lubricants from renewable energy sources – a review

Soni

Agarwal

2014

Green Chemistry Letters and Reviews

114

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Lubricant oils are known to decrease the friction coefficient between two contacting surfaces. It is essential for the correct function of almost the totality of mechanical machinery working in the entire world. Lubricant oils consist of about 80% of oily base stocks which attributes to their properties of viscosity, stability, and pour point to the lubricant plus additives supplemented to improve these properties. Petroleum lubricants are usually environmentally unacceptable due to their low biodegradability and toxicity. These oils contaminate the air, soil, and drinking water and affect human and plant life to a great extent. Thus, the demand for environmentally acceptable lubricants is increasing along with the public concerns for a pollution-free environment. Plant oils are promising as base fluid for biolubricants because of their excellent lubricity, biodegradability, viscosity-temperature characteristics, and low volatility. The purpose of this paper is to present a survey of the current status of biolubricating oil. This research provides an overview on the synthesis, tribochemical behavior; the effect of structure on friction/wear, load-bearing capacity, resistance to rise in specimen temperature, and varying response of antiwear/extreme-pressure additives in the presence of vegetable oil/derivative structures has also been discussed. Though a significant number of papers have been published in this area, there is still much to explore. A proper selection of base oil and additives is therefore essential for an efficient synthesis of biolubricating oil.

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Depression of pour points of vegetable oils by blending with diluents used for biodegradable lubricants

Cited by 156 publications

References 14 publications

Vegetable oil basestocks for lubricants

Vegetable oil basestocks for lubricants

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

Lubricants from renewable energy sources – a review

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