Journal of the American Oil Chemists’ Society

, Volume 72, Issue 8, pp 895–904

Low-temperature properties of triglyceride-based diesel fuels: Transesterified methyl esters and petroleum middle distillate/ester blends

  • R. O. Dunn
  • M. O. Bagby

DOI: 10.1007/BF02542067

Cite this article as:
Dunn, R.O. & Bagby, M.O. J Am Oil Chem Soc (1995) 72: 895. doi:10.1007/BF02542067


This work examines low-temperature properties of triglyceride-based alternate fuels for direct-injection compression-ignition engines. Methyl esters from transesterified soybean oil were studied as neat fuels and in blends with petroleum middle distillates (No. 1 or No. 2 diesel fuel). Admixed methyl esters composed of 5–30 vol% tallowate methyl esters in soyate methyl esters were also examined. Pour points, cloud points, and kinematic viscosities were measured; viscosities at cooler temperatures were studied to evaluate effects of sustained exposure. Low-temperature filterability studies were conducted in accordance with two standard methodologies. The North American standard was the low-temperature flow test (LTFT), and its European equivalent was the cold-filter plugging point (CFPP). With respect to cold-flow properties, blending methyl esters with middle distillates is limited to relatively low ester contents before the properties become preclusive. Under most conditions, cold-flow properties were not greatly affected by admixing the methyl esters with up to 30 vol% tallowate (before blending). Least squares analysis showed that both LTFT and CFPP of formulations containing at least 10 vol% methyl esters are linear functions of cloud point. In addition, statistical analysis of the LTFT data showed a strong 1:1 correlation between LTFT and CP. This result may prove crucial in efforts to improve low-temperature flow properties of alternate diesel fuels that contain methyl esters derived from triglycerides.

Key words

Blendscloud pointcold-filter plugging pointkinematic viscositylow-temperature flow testmethyl estersmethyl soyatemethyl tallowatepour point

Copyright information

© AOCS Press 1995

Authors and Affiliations

  • R. O. Dunn
    • 1
  • M. O. Bagby
    • 1
  1. 1.Oil Chemical Research, USDA, ARS, NCAURPeoria