From the upper series of curves given in Fig. 14, the correction to the volumetric
average boiling point (VABP) to obtain the mean average (MEABP) is À5
F.
Thus, the MEABP is
ASTM D 86. 10%−90% slope °F/% recovered
0
To obtain
weight average
boiling point (WABP)
To obtain
molal average
boiling point (MABP)
Correction to be added to volumetric average
boiling point (°F) obtain other boiling points
Characterizing boiling points
of petroleum reactotrs
(from API Technical Data Book)
To obtain
mean average
boiling point (MeABP)
To obtain
cubic average
boiling point (CABP)
20
−20
−40
−60
280
240
200
Molecular weight
160
120
9 0 ° A P I
8 0 °
7 0 °
6 0 ° A P I
5 0 °
4 0 °
3 0 °
2 0 °
1 0 °
4 0 ° A P I 3 0 ° 2 0 ° 1 0 °
80
100
200
300
400
Mean average boiling point (°F)
500
600
700
800
0
2
4
20 0
20 0
2 0 0
2 0 0
40 0
40 0
4 0 0
4 0 0
8 0 0
60 0
60 0
6 0 0
6 0 0
6 0 0
6
80 0
80 0
VA BP
V A B P
V A B P
V A B P
8
VABP= volumetric average boiling point (°F)
Fig. 14 Correlation between boiling point, molecular weight, and gravity
32
D.S.J. Jones