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Lithium soap

Soap consisting of a lithium salt of a fatty acid

Summary

Soap consisting of a lithium salt of a fatty acid

[[File:Stearic Acid Lithium Salt Structural Formula V.2.svg	center	200px]] Lithium stearate, the lithium salt of stearic acid.

Lithium soap is a soap consisting of a lithium salt of a fatty acid. Sodium-based and potassium-based soaps are used as cleaning agents in domestic and industrial applications, whereas lithium soaps are used as components of lithium grease (white lithium).

Lithium soaps are produced by saponification of triglycerides, using lithium hydroxide or lithium carbonate as the saponification agent. Lithium soaps are used as lubricant components and form-release agents at relatively high temperatures. The main components of lithium soaps are lithium stearate and lithium 12-hydroxystearate.

Lithium grease

Tube of grease ("Fett" in German) made from lithium soap.

Lubricating greases are commonly formulated as mixtures of an oil and a lithium soap thickener. Some formulations include PTFE or other substances, such as molybdenum disulfide.

Lithium grease adheres particularly well to metal, is non-corrosive, may be used under heavy loads, and exhibits good temperature tolerance. It has a dropping point of 190 to and resists moisture, so it is commonly used as lubricant in household products, such as electric garage doors, as well as in automotive applications, such as constant-velocity joints. Lithium greases using a thickener formed by reacting a simple lithium soap with an acid are known as lithium complex greases and have higher dropping points as well as improvements to other properties.

References

Tharwat F. Tadros. (1 April 2014). "An Introduction to Surfactants". De Gruyter.
Arno Cahn. (30 May 2003). "5th World Conference on Detergents: Reinventing the Industry : Opportunities and Challenges". The American Oil Chemists Society.
(1934). "The Significance of Tests of Petroleum Products: A Report". ASTM International.
Uttam Ray Chaudhuri. (19 April 2016). "Fundamentals of Petroleum and Petrochemical Engineering". CRC Press.
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
David Turner. "Grease Selection: Lithium vs. Lithium Complex".

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

greases lithium-salts organolithium-compounds

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