Lithium 12-hydroxystearate
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| Names | |
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| IUPAC name
Lithium 12-hydroxyoctadecanoate | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.028.669 |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C18H35LiO3 | |
| Molar mass | 306.42 g·mol−1 |
| Appearance | White powder |
| Melting point | > 200 °C (392 °F; 473 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Lithium 12-hydroxystearate is an organic compound with the formula CH3(CH2)5CH(OH)(CH2)10CO2Li. It is classified as a lithium soap, i.e., the lithium salt of the fatty acid 12-hydroxystearic acid. Like most lithium soaps, it a soft white solid. Lithium soaps are key component of many lubricating greases.[1]
Use
Lithium 12-hydroxystearate is a component of commercial greases. It exhibits high oxidation stability and a dropping point up to around 200 °C. Most greases used in motor vehicles, aircraft, and heavy machinery contain lithium stearates, mainly lithium 12-hydroxystearate.[1] For applications, lithium 12-hydroxystearate is usually dispersed in synthetic oils such as silicone oil and ester oil. The synthetic oils are preferred for their greater stability and ability to perform at extreme temperatures.
Production
Lithium soaps manufactured by hydrolysis of hydrogenated castor oil. The hydrogenation process converts ricinoleate moieties in castor oil triglycerides to 12-hydroxystearates. Samples typically consist of a mixture of lithium 12-hydroxystearate and lithium stearate.[2]
Lithium 12-hydroxystearate can also be prepared by combining lithium hydroxide and 12-hydroxystearic acid.[3] Since these lithium soaps are difficult to filter, they are collected by spray drying.
References
- 1 2 Wietelmann, U.; Bauer, R.J. (2000). "Lithium and Lithium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH.
- ↑ Maskaev, A.; Mankovskaya, N.; Lendel, I.; Fedorovskii, T.; Simurova, E.; Terenteva, V (1971). "Preparation of 12-hydroxystearic acid, the raw material for plastic greases". Chemistry and Technology of Fuels and Oils. New York: Springer.
- ↑ Angelo Nora, Alfred Szczepanek, Gunther Koenen, "Metallic Soaps" in Ullmann’s Encyclopedia of Industrial Chemistry 2005 Wiley-VCH, Weinheim. doi:10.1002/14356007.a16_361
External links
- Hughs, R (2011). "Understanding the Basics of Grease". ReliabilityWeb. Archived from the original on 2011-01-07.