Home Work #2
CHE - 441, Chemical Engineering
Department
2nd Semester 1434-1435
King Saud University
Prof. Tariq AI-Fariss
1. Define the following terms and mention the significance of their
measurements:
(a) Smoke Point
(b) Flash and Fire Point
(c) Pour Point
(d) Aniline Point
(e) BS & W
2. Why does Crude Oil need to be desalted?
3. Describe how the hydrocarbon series influence the properties of
petroleum?
4. How do you adjust the vapor pressure of gasoline?
5. Which one of the following molecules is likely to have a higher octane
number and why?
a. n-octane and isooctane
b. n-heptane and n-octane
c. n- heptene and n-octane
d. n-pentane and cyclopentane
6. Calculate the Diesel Index of diesel oil with 40 API and 140 Faniline point.
What is the significance of this number?
7. In a heat exchanger, kerosene enters at 420F and leaves at 300F, while
crude oil is heated from 270 F to 285 F. Calculate the ratio of the flowrate
of Kerosene (45 API) to that of the crude oil (43 API). Characterization
factor K=11.
8. Choose the Correct Answer
1. Octane number of n-heptane is
a. 80
2.
b.20
c.l00
d.O
Octane number of gasoline is a measure of its
a. anti knock property b. Ignition delay C. volatility d. viscosity
3.
Which of the following has highest octane number
a. aromatics
4.
b. olefins c. iso-paraffins
d. naphthenes
Cetane number of a diesel oil is a measure of its
a. anti-knock property b. ignition delay c. volatility
5.
Cetane number for alpha methyl naphthalene is
a. 50
6.
b.l00
d.15
b.olefins c. iso-paraffins
d. normal parafinns
Viscosity index is a measure of
a.
Flow characteristics c. variation of viscosity with temperature
b.cloud point
8.
c.0
Which of the following has highest cetane number
a. aromatics
7.
d. viscosity
d: lubricating oil oxidation stability
Aniline point is the temperature at which
a.
equal weight of diesel and aniline are completely miscible
b.
equal weight of aniline and test sample are completely miscible
c.
equal volume of aniline and test sample are completely miscible
d. aniline vaporizes
9. Gum formation in stored gasoline is mainly due to
a.alkylation of unsaturates c. presence of sulfur
b. oxidation and polymerization of unsaturates
d. high aromatic content
10. True vapor pressure of a petroleum fraction
a. is less than Reid Vapor Pressure by 5-9%
b.
is more than Reid Vapor Pressure by 5-9%
c.
is the same as Reid Vapor Pressure
d. may be either less or more than Reid Vapor Pressure depending on the
composition
11. which of the following fractions have largest API gravity
a. diesel
b. gasoline
c. atmospheric gas oil
12. The characterization factor of crude oil is around
a. 3
b.ll
c.22
d.28
d. vacuum gas oil