Cetane index (CI) is a quality indicator for diesel fuel. It can be calculated based on the distillation characteristics and density according to ASTM D976. ASTM D976 Cetane Index = 454.74 – 1641.416 D + 774.74 D² – 0.554 T5o + 97.803 (log Ts0)² where D: Density at 15 °C, g/mL Tso: The temperature at which 50% of the fuel evaporates, °C The density and distillation temperature for 2 diesel samples are tabulated Table 3. Calculate the CI of these samples. Table 3 D, g/mL Sample 1 2 CI 51.938 32.521 T50, °C 0.8491 0.9210 290 290 ) Briefly explain the relationships between the index and the sample characteristics. (ii) Explain the changes in the CI values for both samples in relation to the density and the auto-ignition characteristics.
Cetane index (CI) is a quality indicator for diesel fuel. It can be calculated based on the distillation characteristics and density according to ASTM D976. ASTM D976 Cetane Index = 454.74 – 1641.416 D + 774.74 D² – 0.554 T5o + 97.803 (log Ts0)² where D: Density at 15 °C, g/mL Tso: The temperature at which 50% of the fuel evaporates, °C The density and distillation temperature for 2 diesel samples are tabulated Table 3. Calculate the CI of these samples. Table 3 D, g/mL Sample 1 2 CI 51.938 32.521 T50, °C 0.8491 0.9210 290 290 ) Briefly explain the relationships between the index and the sample characteristics. (ii) Explain the changes in the CI values for both samples in relation to the density and the auto-ignition characteristics.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Answer questions (i) and (ii)
Transcribed Image Text:Cetane index (CI) is a quality indicator for diesel fuel. It can be calculated based on
the distillation characteristics and density according to ASTM D976.
ASTM D976
Cetane Index = 454.74 – 1641.416 D + 774.74 D² – 0.554 T50 + 97.803 (log T50)?
where
D: Density at 15 °C, g/mL
Tso: The temperature at which 50% of the fuel evaporates, °C
The density and distillation temperature for 2 diesel samples are tabulated Table
3. Calculate the CI of these samples.
Table 3
Sample
D, g/mL
T50, °C
CI
1
290
51.938
0.8491
0.9210
290
32.521
(i) Briefly explain the relationships between the index and the sample
characteristics.
(ii) Explain the changes in the CI values for both samples in relation to the density
and the auto-ignition characteristics.
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