Lubricity of light-end fuels with commercial diesel lubricity additives

Paper #:
  • 2017-01-0871

Published:
  • 2017-03-28
Abstract:
Lubricity of various fuels was tested using a modified version of ASTM D6079, which uses a high frequency reciprocating rig (HFRR). The fuels were tested as received, and with various amounts of commercial diesel lubricity additives. Lubricity of the neat fuels was found to be the best for diesel certification fuel, and worst for light-end fuels. Among the light-end fuels, market gasoline and several formulated gasolines had slightly better lubricity than straight-run naphtha. Several commercial diesel lubricity additives were tested including those with organic-acid, ester, and arctic ester chemistry. All diesel lubricity additives tested were able to substantially improve the lubricity of the naphtha and gasoline fuels. The best additives (Infineum R697 and Infineum R650) reduced the wear scar diameter in the HFRR test to around 200 μm at a concentration of 200 mg/kg (the typical maximum dosage), putting them well below the maximum specifications for market No. 2 diesel fuel (520 μm in the US and 460 μm in many other countries). Improved lubricity may be able to compensate for low viscosity; however this effect has yet to be verified. In general, lubricity additives are expected to improve the durability of high-pressure, fuel-lubricated pumps when they are used with low viscosity, low lubricity fuels.
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