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ASTM distillation
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The following data are obtained by performing the experiment

Initial boiling point  of the product = 540C

 

Volume percent distilled    

Temperature 0C

10 65
15 69
20 74
25 78.5
30 83.5
35 90
40 94.5
45 100
50 104.5
55 109
60 114
65 119.5
70 125.5
75 133
80 141.5
85 155
90 173
92 150

 

Final  boiling point  of the product = 1730C

Volume distilled = 92 ml

Residue left = 2 ml

Evaporated = 6 ml

 A plot of volume percent distilled and temperature can be plotted as shown below:

 

 

Discussions :

1.The boiling range gives the information on the composition ,the properties and the behaviour of the fuel during storage and use.

 

2.The distillation characteristics of hydrocarbons have an important efffect on their safety and performance.

 

3. Volatility is the major determinant of the tendency of a hydrocarbon mixture to produce potentially explosive vapour.

 

Applicable literature :

A comparison between indian gasoline specification for BS - IV and our experimental result is given below :

  Our result BS - IV
IBP (0C) 54 38
FBP (0C) 173 210
Residue (ml) 2 2
Recovery upto  (700C) 10-15 10-45
Recovery upto  (1000C) 75 70

 

Finally we can also convert out ASTM data  obtained from the experiment into TBP data as follows :

 

1. Firstly  a probability chart is plotted  on which all points connecting IBP, ASTM 10 %, ASTM 20 %…… ASTM end point shall lie on a straight line. In other words, knowing any two ASTM temperatures at any two volume % values, the entire ASTM data for the product can be
estimated.

 

Table 1 :ASTM‐TBP correlation data from Edmister method.

 

Table 2: End point correlation data . Data sets represent fractions whose cut point starts at 200 oF TBP or lower (Set A); 300 oF (Set B); 400 oF (Set C); 500 oF (Set D).


2. The ASTM temperatures of the product can be converted to the TBP using Edmister correlation table 1 given in the next tab (Expt calc 2).

 

 3.It is assumed that the 50 % TBP of the crude matches with the 50 % TBP point of the products. Eventually, the 50 % ASTM can be converted to obtain 50 % TBP  point for the products (other than the residue).

 

 

 

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