The single effects of FFA content and water contents should be noted. Without adding FFA and water, the 0.0 0.2 0.4 0.6 Amount of free fatty acid, % of beef tallow apparent yield of BTME was highest. When 0.6% of FFA was added, the apparent yield of BTME reached the lowest, less than 5, with any level of water added. The products were solid at room temperature, similar to the original beef tallow. When 0.9% water was added, without addition of FFA, the apparent yield was about 17. The apparent yield decreased with the increase of the amount of FFA added, and reached the lowest point with 0.6% FFA The
apparent yield decreased with the increase of the amount of FFA added, and reached the lowest point with 0.6% FFA.