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Functional Fluids

The liquid nature of Solvay's phosphonium salt and ionic liquids and alkylphosphine derivatives products renders them useful in a range of functional fluid applications including lubrication, solvent extraction, separation and electrolytes.

The use of phosphonium ionic liquids as lubricants is based on its tribological properties and compatibility with base oils and high thermal stability. The absence of acidic protons in the phosphonium cation results in low wear. The relatively low viscosity and high viscosity index is one of the more effective lubricants. The wide electrochemical window of ionic liquids makes them well suited as electrolytes for various devices such as batteries, capacitors and solar cells.