Dear researchers,
I want to determine exergy flow for the fuel analysis of a particular diesel engine with known fatty acid composition of methyl ester .How can I determine the mass fraction specified above?
The conversion from mole composition to mass uses the molar mass. One mole of a the core ester group R'-COO-R has two O and one C in moles. Expand the atomic composition in C, H, and O for the R' and R groups the same way using a basis of one mole of your compound. I have done such calculations directly in a spreadsheet application.
Fatty acid containing S is excluded in this answer but you can added in your calculation if the exact composition ids known.
The general chemical formula for a fatty acid methyl ester and their mixture is;
CzH (2z-1-2Nd) OOCH3; where z, number of carbon atoms of fatty acid; Nd, number of double bond(s).
For methyl palmitate, C16H(2×16-1-(2×0)OOCH3 or C16H31OOCH3 and the nominal MW = 16×12 + 31×1 + 47 = 270.
For methyl oleate, C18H(2×18-1-(2×1)OOCH3 or C18H33OOCH3, MW = 296.
For methyl linolenate, C18H(2×18-1-(2×3)OOCH3 or C18H29OOCH3, MW = 292
Similarly, the general structure for the mixture of FAME is CzH (2z-1-2Nd) OOCH3, where z and Nd are the average number of carbon atoms of fatty acid and average number of double bond(s), respectively.
The average of both values can be calculated from fatty acid composition according to (J Am Oil Chem Soc (2016) 93:1407–1414. DOI 10.1007/s11746-016-2874-x),
(This mathematical formula cannot be shown, the file contained the formula is attached
Thus, H/C, O/C can be easily calculated from the chemical structure.
Dear Colleagues,
I am impressed by your explanation but still have some issue. Highlighted in Table 1 is the values of the fatty acid composition of biodiesel determined from GC.of the B100.
How can determine the mass fraction values of h/c, o/c and s/c for B0, B7.5, B15, B22.5, B30, B37.5, B45, B60 and B100 in order to determine Ef for the B0, B7.5, B15, B22.5, B30, B37.5, B45, B60 and B100, please.
Table 1: Acid Methyl Ester Composition Based on Percent Mass biodiesel
Caprylic (C8:0)- 0.485
Capric (C10:0)- 0.388
Lauric (C12:0)- 1.133
Myristic (C14:0)- 1.432
Palmitic (C16:0)- 32.792
Palmitoleic (C16:1)- 0.111
Margaric (C17:0)- 0.174
Stearic (C18:0)- 4.381
Oleic (C18:1)- 43.000
Linoleic (10:2)- 12.660
Linolenic (C18:3)- 0.942
Arachidic (C20:0)- 0.567
Arachidonic (C20:4)- 0.779
Behenic (C22:0)- 0.418
Erucic (C22:1)- 0.208
Lignoceric (C24:0)- 0.525
Dear Colleagues,
A good paper entitled, "Shahavi, M. H., Hosseini, M., Jahanshahi, M., Meyer, R. L., & Darzi, G. N. (2016). Clove oil nanoemulsion as an effective antibacterial agent: Taguchi optimization method. Desalination and Water Treatment, 57(39), 18379-18390", you can be explored for Taguchi study.
there are other than ester components in a "FAME" product, these are rarely checked in routine analysis
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