CHE-422- Chemical Process Safety
Due Date: 28-09-2021
Dr. Faheem Hassan Akhtar
Assignment 1 (Total Marks :40)
Q1
A chemical process industry is producing nitroaniline and (10)
ammonium
chloride
from
ammonia
and
onitrochlorobenzene in a batch reactor, which is an exothermic
reaction. The reactor is normally maintained at a constant
temperature of 150 °C by a cooling jacket and a pressure of
about 400 psi.
Identify the potential hazards/consequences if:
i)
ii)
iii)
CLO 1
(C4)
Pressure higher than required pressure
Temperature higher than required temperature
Composition varies
Q2
A company manufactures and supplies a variety of powder (10)
coating and paint additives by polymerizing acrylic
monomers. The company had received an order for slightly
more of an additive than the normal size recipe would
produce. Managers at the facility made several changes in
reaction conditions and decided to scale up the recipe to
produce a single batch rather than running two half-batches.
This decision was made to save time and effort, but the
changes in conditions increased the total amount of
monomer in the reactor by 50%, increased the concentration
of the monomer by 33%, and increased the atmospheric
boiling point of the mixture by almost 5°C. What are the
possible hazards and consequences in this case?
CLO 1
(C4)
Q3
The Centers for Disease Control and Prevention estimates that (10)
several thousand people go to hospital emergency rooms
every year to be treated for CO poisoning. Most people will
not experience any symptoms from prolonged exposure to
CO levels of approximately 1 to 70 ppm but heart patients
might experience an increase in chest pain. As CO levels
increase and remain above 70 ppm, symptoms become more
noticeable and can include headache, fatigue. At sustained
CO concentrations above 150 to 200 ppm, even, deaths are
possible. Analyze the claim about possibility of deaths using
the probit variable equation
CLO 2
(C5)
Q4
Coronavirus disease (COVID-19) is an infectious disease (10)
caused by the SARS-CoV-2 virus. Most people who fall sick with
COVID-19 will experience mild to severe symptoms and
recover without special treatment. However, some will
become seriously ill and require medical attention. According
to Coronavirus Resource Center at John Hopkins University of
Medicine, there were 79 confirmed COVID positive cases in
Madagascar in the past month. Whereas the severity of
symptoms varied in these positive cases and represented on
a scale of 0-10, with 0 indicating mild symptoms such as low
grade fever, dry cough etc. and 10 indication high symptoms
such as Shortness of breath, chest discomfort, etc. The number
of individuals exhibiting a specific level of symptoms is given in
the following table:
Level of Symptoms
Number of individuals
affected
0
0
1
5
2
3
3
2
4
15
5
17
6
12
7
10
8
8
9
4
10
3
a) Determine the mean and the standard deviation
b) Determine the probability (or fraction) of individuals
experiencing a specific level of symptoms
CLO 2
(C5)
CLOs
CLO 1
Identify the potential hazards and hazardous conditions in the
chemical industries
C4
CLO 2
Evaluate the toxic effect of chemicals and other occupational
hazards
C5
CLO 3
Assess the risk and apply the risk management plan in the
chemical processes using various models, such as HAZOP
C5