Appendix: Biodiesel Composition and Properties of Components

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The following table summarizes the composition of common fatty oils used in the production of (mono alkyl ester) biodiesel [1391]. The designation Ca:b is used to describe the fatty acid molecules where a is the chain length in carbon atoms and b is the number of unsaturated carbon-carbon bonds.

Table 1
Composition of Common Fatty Oils, % (m/m)

Rapeseed (high erucic)Rapeseed (low erucic)SoybeanSunflowerCoconut oilPalm kernel oilPalm oil (Africa)Palm oil (Indonesia)Beef tallowChicken fatFish oil
Saturated fatty acids< C10:0~13~7trace
C12:0tracetracetrace41-4641-45tracetrace-0.5tracetrace
C14:0tracetrace<0.5trace-0.118-2115-171-2~12-4~16-9
C16:02-43-68-125.5-89-127-1041-4641-4723-2920-2411-20
C18:01-21-2.53-52.5-6.52-42-34-6.54-620-354-71-4
C20:00.5-1<1<0.5<0.5tracetrace-0.3~0.5~0.5<0.5trace-1
C22:00.5-2.0trace-0.5trace0.5-1.0tracetrace-0.5tracetrace
C24:00.5trace-0.2<0.5trace-1
Unsaturated fatty acidsC14:1trace~0.5trace
C16:1~0.50.1-0.5trace<0.5trace<0.5~0.52-4~76-11
C18:111-2452-6618-2514-345-910-1837-4237-4126-4538-4412-15
C18:210-2217-2549-5755-730.5-31-38-12~102-618-231-2
C18:37-138-116-11trace-0.4tracetrace-0.5trace-0.5trace-0.5~1~10.5-1
C20:1~101.5-3.5<0.5<0.5tracetrace-0.5tracetrace<0.51-16
C20:x*trace-0.1trace6-19
C22:141-52trace-2.5trace-0.31-20
C22:x*~0.50.5-15-14
C24:1tracetrace-1
Other constituentsPhosphatides2.51.1-3.2<1.50.05-0.1<0.07
Tocopherols0.07-0.080.09-0.120.07-0.10.0030.02-0.120.001
Sterols0.5-1.10.2-0.40.25-0.450.05-0.10.08-0.120.04-0.080.08-0.14~0.3
* x > 1
trace ≤ 0.05%

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