ADECH02 SOLUTION PROB3 1

HANOI UNIVERSITY OF MINING AND GEOLOGY
ADVANCED PROGRAM IN CHEMICAL ENGINEERING
ADECH02 - Petroleum Refinery
SOLUTION PROB 3.1
D.V.Dai K4 – 5/2017
Theory
1. API method
 𝑇𝐵𝑃 = 𝑎(𝐴𝑆𝑇𝑀 𝐷86)𝑏
(3.1)
 where a and b are constants varying with percent of liquid sample distilled.TBP is true boiling
point temperatures at 0, 10, 30, 50, 70, 90, and 95 volume percent distilled, in degrees Rankin.
ASTM D86 is the observed ASTM D86 temperatures at corresponding volume percent
distilled, in degrees Rankin. Average error between the calculated and measured TBP is in the
range of 5°C (41°F).
2. Convert temperature °C to °R
9
 T°R = 5 𝑇°𝐶 + 491.67
(3.2)
Result
Table 3.1. Converted ASTM temperatures
Vol%

D86(°C)

0
10
30
50
70
90
95

138.8
149.6
158.8
165.8
169.9
178.1
180.4

TBP (°R)
API method
688.33
729.57
766.46
792.60
807.37
829.78
829.46

TBP (°C)
109.26
132.17
152.66
167.18
175.39
187.84
187.66

Figure 3.1 Conversion of ASTMD86 into TBP
Temperature °C

200
150
100

ASTM D86

50

TBP

0
0

50
Volume%

100


Appendix
Table 3.2.Constants for equation (3.1)
Vol %

a

b

0
10

30
50
70
90
95

0.9167
0.5277
0.7429
0.8920
0.8705
0.9490
0.8008

1.0019
1.0900
1.0425
1.0176
1.0226
1.0110
1.0355

Table 3.3.Convert temperature data in ASTM D86
Vol%
Temp (°C)
Temp (°R)

0.0
138.8
741.51

10.0
149.6
760.95

30.0
158.8
777.51

50.0
165.8
790.11

70.0
169.9
797.49

Convert these data to TBP data
At vol%=0.0 , 𝑇𝐵𝑃 = 0.9167(741.51)1.0019 = 688.33°𝑅 = 109.26°𝐶

90.0
178.1
812.25

95.0
180.4
816.39