- Predicting ASTM D93 PMCC flash point from Distillation Data

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- Predicting ASTM D93 PMCC flash point from Distillation Data

Earlier I had posted an correlation equation of predicting Abel FP (IP 170) with Front end distillation data at my blog on March 25, 2015 as follow:  https://rjpatelioc-petroleum.blogspot.in/2015/03/relationship-between-flash-point-and.html

Predicted Abel FP=0.613*IBP+0.193*T10- 84

The same equation for ASTM D56 - Tag Flash point is

Predicted  Tag FP=0.613*IBP+0.193*T10- 82

In above equations Flash Point and Distillation data are in Centigrade.
Equations are applicable  to Jet A-1 and Kerosene samples and accuracy is up to 60 C.

Now Predicting ASTM D93 PMCC flash point from Initial Boiling Point of Distillation is innovated as follow:

Predicted PMCC FP=0.0092*(TIBP)2 - 2.589*(TIBP) + 236

- FP and IBP figures are in C
- Applicable to Gasoil Samples from 60 C  and above
- FP is manual and Auto D93,  as well as D3828
- Distillation is D86 Manual and Auto & D7345

Accuracy of this equation is very high as can be seen validation against ASTM Proficiency testing program samples of past few years, Comparison given below:  


ASTM PRP No.
IBP manual
Flash Point


D93 actual
Predicted
Difference
DF21010
183.62
55.3
57.9
-2.6
DF21102
173.21
55.5
55.4
0.1
DF21106
184.82
58.5
58.7
-0.3
DF21202
153.74
59.6
58.2
1.3
DF21206
161.67
59.6
61.3
-1.7
DF21210
178.22
59.9
59.3
0.7
DF21302
167.84
61.3
59.9
1.4
DF21306
163.68
62.3
60.6
1.6
DF21310
166.29
63.6
63.6
0.0
DF21402
178.69
63.6
62.4
1.2
DF21406
164.94
65.6
67.1
-1.5
DF21410
171.17
67.3
66.8
0.5
DF21502
162.52
70.2
70.8
-0.6
Df21506
189.1
70.4
71.8
-1.3
DF21510
169.17
77.1
75.4
1.7

Above ASTM PTP data correlated  are from robust mean of hundreds labs and the innovated prediction equation gives so accuracy despite reproducibility of PMCC Flash point and IBP both are about 5 C. The test case will off course depend on how accurately you have determined IBP and D93 Flash Point.

Thus prediction equation is very much useful to verify accuracy of both IBP and PMCC Flash Point and any variation demands recheck of those parameters.

As of now, no other more accurate than above equations can be found on internet. 

The Abel equation was developed way back in 1980s whereas the D93 prediction equation is developed recently.  Some of the available internet references are given below which are much less accurate than above.

Author's Profile

Follow me on twitter @RJPatel13 to get notification when my new post is available in my blog.

http://www.eng-tips.com/viewthread.cfm?qid=178623

http://simulationots.blogspot.in/2013/03/what-are-flash-point-calculation-methods.html

http://www.sciencedirect.com/science/article/pii/S0016236112004358

RJ Patel

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