Formula, molecular weight and properties of fatty acids ...

Formula, molecular weight and properties of fatty acids and their methyl esters.

Fatty acid Methyl ester

Palmitic acid Methyl palmitate

Stearic acid Methyl stearate

Oleic acid Methyl oleate

Linoleic acid Methyl linoleate

Linolenic acid Methyl linolenate

Formula Acronym Molecular Melting point Cetane

weight [?C]

number

C16H32O2 C16:0

256.4

63-64

---

C17H34O2

270.5

30.5

74.5

C18H36O2 C18:0

184.5

70

---

C19H38O2

198.5

39

86.9

C18H34O2 C18:1

282.5

16

C19H36O2

296.5

-20

--47.2-55

C18H32O2 C18:2

280.5

-5

C19H34O2

294.5

-35

--28.5-42.2

C18H30O2 C18:3 C19H32O2

278.4 292.5

-11 -52/-57

--20.6-22.7

American and European specifications for pure biodiesel (B100) prior to use or

blending with diesel fuel.

Property

Acid Number Calcium and magnesium Carbon residue Cetane number Cloud point Cold soak filterability Copper strip corrosion Density Distillation - Atmospheric equivalent temperature 90% recovery Flash point Glycerin ? Free Monoglyceride Diglyceride Triglyceride Glycerin ? Total Iodine value Kinematic viscosity - 40?C Linolenic acid methyl ester Methanol content Oxidation stability Phosphorus content Polyunsaturated (>4 double bonds) methyl esters Sodium and potassium Sulfated ash Sulfur (S15) Sulfur (S500) Total contamination Viscosity 40?C Water content Water and sediment

ASTM D 6751-08 limit

maximum 50 5

maximum 0.050 minimum 47 report maximum 360 maximum 3 ---

DIN EN 14214 limit

maximum 50 ---

maximum 0.3 minimum 51

report maximum 360

Class 1 860 - 900

maximum 360

---

minimum 130 maximum 0.020

------maximum 0.240 --1.9 ? 6.0 --maximum 0.20 minimum 3 10 ---

minimum 101 maximum 0.02 maximum 0.80 maximum 0.20 maximum 0.20 maximum 0.25

120 1.9 ? 6.0

12 maximum 0.20

minimum 6 10

maximum 1.00

maximum 5 maximum 0.02 maximum 15.0 maximum 500

------maximum 0.050

maximum 5 maximum 0.02

----maximum 24.0 3.50 ? 5.00 maximum 500 maximum 0.050

Unit

mgKOH/g ppm wt% No. ?C sec

No./Rating Kg m3 -1

?C

?C wt% wt% wt% wt% wt% unit mm2 sec-1 wt% wt% hours ppm wt%

ppm wt% ppm ppm ppm mm2 ppm Vol.%

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