University Of Pune Question Paper
S.E. (Petroleum/Petrochemical/Polymer) (Sem. – II) Examination, 2011
PROCESS CALCULATIONS
(2003 Course)
Time : 3 Hours Max. Marks : 100
Instructions: 1) Answers 3 questions from each Section.
2) Answers to the two Sections should be written in separate
books.
3) Neat diagrams must be drawn wherever necessary.
4) Figures to the right indicate full marks.
5) Use of logarithmic tables, slide rule, Mollier charts, electronic
pocket calculator and steam tables is allowed.
6) Assume suitable data, if necessary.
SECTION – I
1. a) Small animals such as mice can live at reduced air pressures down to 20 kPa.
In a test mercury manometer attached to a tank inside which a mouse is kept,
reads differential pressure of 64.5 cm. Hg. The barometer reading of the room
is 100 kPa. Will the mouse survive ? 6
b) 164.5 gm of barium chloride (BaCl2) is dissolved in 135 ml of water. Obtain
the salt concentration in wt % and in normality. 6
[Atomic Weight of Ba = 137.34, Cl = 35.45]
c) Define : Molality and Normality. 4
OR
2. a) An binary mixture contains 92% (by weight) of ethanol and rest water. Obtain
the composition in mol percentage. Also evaluate mol fraction of water
present. 6
b) If 6.5 gm of sugar (sucrose) be dissolved in 135 ml of water, what will be
concentration in wt% and in terms of molarity ? 4
c) An aqueous solution of oxalic acid of 32% concentration (by weight) has
density of 1.34 kg/lit at 25°C. Calculate normality, molality and molarity of the
solution. 6
P.T.O.
[3962] – 348 -2-
3. a) A mixed acid containing 65% (by wt) H2SO4, 20% HNO3 and rest water is
to be made by blending following liquids : 10
i) A spent acid containing 10% HNO3, 60% H2SO4 and rest water.
ii) A concentrated nitric acid containing 90% HNO3, rest water.
iii) Concentrated sulfuric acid containing 98% H2SO4 and rest water.
How many kgs of each of the three available acid streams must be used to obtain
1000 kg of mixed acid ?
b) A mixture of gases contains 10.5% CO2, 13.0% Cl2, 12.7% N2 and rest
hydrogen (all in mol %). 6
i) Determine average molecular weight of the gas.
ii) Calculate the gas composition in weight fractions.
OR
4. a) To prepare a solution of 50% sulfuric acid, a dilute waste acid containing 28%
H2
SO4
is fortified with a purchased acid of 96% H2
SO4
. How many kilograms
of purchased acid must be bought for each 100 kg dilute acid ? 4
b) Acetylene gas is produced according to the following reaction : 6
CaC2 + 2 H2O → C2H2 + Ca(OH)2.
Calculate number of hours of service that can be derived from 1 kg of calcium
carbide in an acetylene lamp burning 0.1 m3 of gas per hour at temperature of
298 K and pressure of 99.32 kPa.
c) Define : Limiting Reactant, Yield and Selectivity. 6
5. a) Define : Saturation Pressure, Relative Humidity, Humid Volume. 6
b) An air-tight room having volume of 17.86 m3 at 1 atm pressure. Calculate
partial volume of components in the room and partial pressures of individual
components. 6
c) Define Bubble Point and provide stepwise procedure of obtaining Bubble
Point for a multi-component mixture. 6
OR
6. a) The solubility of barium nitrate at 100 °C is 34g/100 g of water. And at 0 °C is
5.0g/100 g of water. If you start with 100 g of Ba (NO3
)
2
and make a saturated
solution in water at 100 °C, how much water is required ? The precipitated
crystals carry along with them on their surface 4 g of water per 100 g of
crystals. 10
[Atomic Weight of Ba = 137.34].
b) 100 kg of mixture F containing 50% Ethanol, 40% water and rest Methanol
(all in wt. %) flashed to produce P kg of 80% Ethanol, 5% water and rest
Methanol and W kg of 5% Ethanol, 92.5% water and 2% Methanol. Evaluate
P and W. 8
SECTION – II
7. a) Discuss Proximate and Ultimate analysis of coal. 6
b) Propane is mixed with oxygen to obtain a gas containing 67.80% C3H8 and
rest O2 that is burned in an engine with 200% excess air. 82% of the propane
produces CO2, 12.5% goes to CO and rest remains unburned. Calculate
composition of the exhaust gas on a wet basis. 10
OR
8. a) If 300 kg of air and 24 kg of carbon are fed to a reactor at 460°C and after
complete combustion no material remains in the reactor, how many kgs of
carbon will have been removed ? How many kgs of oxygen ? How many kgs
total ? 8
b) Aviation gasoline is iso-octane C8H18. If it is burned with 20% excess air and
30% of the carbon forms carbon monoxide, what is Orsat analysis ? 8
9. a) A synthesis gas analyzing 6.4% CO2
, 0.2% O2, 40% CO and 50.8 % H2
and
rest N2
is burned with 40% dry excess air. What is the composition of the
flue gas ? 8
b) The molar heat capacity of Cumene is given by 10
Cp = 139.2 + 53.76×10–2 T – 39.79×10–5 T2 where Cp is in kJ/(kmol.K) and
T is in K.
i) Calculate the mean molar heat capacity in the temperature range of
300 – 1000 K.
ii) Cumene enters a heat exchanger at a rate of 450 m3/hr at STP. Calculate
the heat to be supplied to the gas to raise its temperature from 400 to 700 K.
OR
10. a) What is adiabatic flame temperature ? How it is determined ? Discuss its
importance. 6
b) Discuss following :Combustion, Orsat, Analysis. 6
c) A stream flowing at rate of 132.5 mol/hr containing 72.5 mole % N2 and rest
H2 is to be heated from 25°C to 230°C . Calculate total quantity of heat to be
transferred. Cp data are as follows : 6
Gas a b×103
c×106
N
2
25.591 −5.41 13.183
H
2
28.61 1.02 − 0.15
11. a) An irn pyrite ore containing 85% FeS2
and 15% gaunge (inert, dirt, rock etc.)
is roasted with an amount of air equals to 200% excess air according to the
reaction
4FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2
In order to produce SO2. All the gauge plus Fe2O3 end up in the solid waste
product (cinder), which on analysis shows 4% FeS2. Determine the standard
heat of reaction per kilogram of ore. 8
b) A tank contains 10 m3
of fresh water. Brine having a concentration of 10 kg
salt/m3 is sent into the tank at the rate of 250 lit/min. The mixture is kept
uniform by mixing and runs out at a rate of 120 lit/min. Calculate the exit
brine concentration when tank contains 20 m3
of brine. 8
OR
12. a) Hydrochloric acid is an important industrial chemical. To make aqueous
solution of it of commercial grade (called muriatic acid), purified HCl (g) is
absorbed in water in a tantlum absorber in a continuous process. How much
heat is to be removed from the absorber per 100 kg of product if hot HCl (g)
at 120°C is fed into water in the absorber. The feed water can be assumed to
be at 25 °C and the exit product HCl (aq.) is 25% HCl (by wt) at 35°C
Data: Cp for HCl (g) = 29.13 – 0.1341×10–2 T + 0.9715×10–2 T2
where, Cp is in kJ/ (kmol. K) with T in K
Cp for product is approximately 2.7 kJ/ (kg. K) 8
b) A square tank 4 m on a side and 10 m high is filled to the brim with water.
Find the time required for it to empty through a hole in the bottom 5 cm2 in
area. 8
——————
S.E. (Petroleum/Petrochemical/Polymer) (Sem. – II) Examination, 2011
PROCESS CALCULATIONS
(2003 Course)
Time : 3 Hours Max. Marks : 100
Instructions: 1) Answers 3 questions from each Section.
2) Answers to the two Sections should be written in separate
books.
3) Neat diagrams must be drawn wherever necessary.
4) Figures to the right indicate full marks.
5) Use of logarithmic tables, slide rule, Mollier charts, electronic
pocket calculator and steam tables is allowed.
6) Assume suitable data, if necessary.
SECTION – I
1. a) Small animals such as mice can live at reduced air pressures down to 20 kPa.
In a test mercury manometer attached to a tank inside which a mouse is kept,
reads differential pressure of 64.5 cm. Hg. The barometer reading of the room
is 100 kPa. Will the mouse survive ? 6
b) 164.5 gm of barium chloride (BaCl2) is dissolved in 135 ml of water. Obtain
the salt concentration in wt % and in normality. 6
[Atomic Weight of Ba = 137.34, Cl = 35.45]
c) Define : Molality and Normality. 4
OR
2. a) An binary mixture contains 92% (by weight) of ethanol and rest water. Obtain
the composition in mol percentage. Also evaluate mol fraction of water
present. 6
b) If 6.5 gm of sugar (sucrose) be dissolved in 135 ml of water, what will be
concentration in wt% and in terms of molarity ? 4
c) An aqueous solution of oxalic acid of 32% concentration (by weight) has
density of 1.34 kg/lit at 25°C. Calculate normality, molality and molarity of the
solution. 6
P.T.O.
[3962] – 348 -2-
3. a) A mixed acid containing 65% (by wt) H2SO4, 20% HNO3 and rest water is
to be made by blending following liquids : 10
i) A spent acid containing 10% HNO3, 60% H2SO4 and rest water.
ii) A concentrated nitric acid containing 90% HNO3, rest water.
iii) Concentrated sulfuric acid containing 98% H2SO4 and rest water.
How many kgs of each of the three available acid streams must be used to obtain
1000 kg of mixed acid ?
b) A mixture of gases contains 10.5% CO2, 13.0% Cl2, 12.7% N2 and rest
hydrogen (all in mol %). 6
i) Determine average molecular weight of the gas.
ii) Calculate the gas composition in weight fractions.
OR
4. a) To prepare a solution of 50% sulfuric acid, a dilute waste acid containing 28%
H2
SO4
is fortified with a purchased acid of 96% H2
SO4
. How many kilograms
of purchased acid must be bought for each 100 kg dilute acid ? 4
b) Acetylene gas is produced according to the following reaction : 6
CaC2 + 2 H2O → C2H2 + Ca(OH)2.
Calculate number of hours of service that can be derived from 1 kg of calcium
carbide in an acetylene lamp burning 0.1 m3 of gas per hour at temperature of
298 K and pressure of 99.32 kPa.
c) Define : Limiting Reactant, Yield and Selectivity. 6
5. a) Define : Saturation Pressure, Relative Humidity, Humid Volume. 6
b) An air-tight room having volume of 17.86 m3 at 1 atm pressure. Calculate
partial volume of components in the room and partial pressures of individual
components. 6
c) Define Bubble Point and provide stepwise procedure of obtaining Bubble
Point for a multi-component mixture. 6
OR
6. a) The solubility of barium nitrate at 100 °C is 34g/100 g of water. And at 0 °C is
5.0g/100 g of water. If you start with 100 g of Ba (NO3
)
2
and make a saturated
solution in water at 100 °C, how much water is required ? The precipitated
crystals carry along with them on their surface 4 g of water per 100 g of
crystals. 10
[Atomic Weight of Ba = 137.34].
b) 100 kg of mixture F containing 50% Ethanol, 40% water and rest Methanol
(all in wt. %) flashed to produce P kg of 80% Ethanol, 5% water and rest
Methanol and W kg of 5% Ethanol, 92.5% water and 2% Methanol. Evaluate
P and W. 8
SECTION – II
7. a) Discuss Proximate and Ultimate analysis of coal. 6
b) Propane is mixed with oxygen to obtain a gas containing 67.80% C3H8 and
rest O2 that is burned in an engine with 200% excess air. 82% of the propane
produces CO2, 12.5% goes to CO and rest remains unburned. Calculate
composition of the exhaust gas on a wet basis. 10
OR
8. a) If 300 kg of air and 24 kg of carbon are fed to a reactor at 460°C and after
complete combustion no material remains in the reactor, how many kgs of
carbon will have been removed ? How many kgs of oxygen ? How many kgs
total ? 8
b) Aviation gasoline is iso-octane C8H18. If it is burned with 20% excess air and
30% of the carbon forms carbon monoxide, what is Orsat analysis ? 8
9. a) A synthesis gas analyzing 6.4% CO2
, 0.2% O2, 40% CO and 50.8 % H2
and
rest N2
is burned with 40% dry excess air. What is the composition of the
flue gas ? 8
b) The molar heat capacity of Cumene is given by 10
Cp = 139.2 + 53.76×10–2 T – 39.79×10–5 T2 where Cp is in kJ/(kmol.K) and
T is in K.
i) Calculate the mean molar heat capacity in the temperature range of
300 – 1000 K.
ii) Cumene enters a heat exchanger at a rate of 450 m3/hr at STP. Calculate
the heat to be supplied to the gas to raise its temperature from 400 to 700 K.
OR
10. a) What is adiabatic flame temperature ? How it is determined ? Discuss its
importance. 6
b) Discuss following :Combustion, Orsat, Analysis. 6
c) A stream flowing at rate of 132.5 mol/hr containing 72.5 mole % N2 and rest
H2 is to be heated from 25°C to 230°C . Calculate total quantity of heat to be
transferred. Cp data are as follows : 6
Gas a b×103
c×106
N
2
25.591 −5.41 13.183
H
2
28.61 1.02 − 0.15
11. a) An irn pyrite ore containing 85% FeS2
and 15% gaunge (inert, dirt, rock etc.)
is roasted with an amount of air equals to 200% excess air according to the
reaction
4FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2
In order to produce SO2. All the gauge plus Fe2O3 end up in the solid waste
product (cinder), which on analysis shows 4% FeS2. Determine the standard
heat of reaction per kilogram of ore. 8
b) A tank contains 10 m3
of fresh water. Brine having a concentration of 10 kg
salt/m3 is sent into the tank at the rate of 250 lit/min. The mixture is kept
uniform by mixing and runs out at a rate of 120 lit/min. Calculate the exit
brine concentration when tank contains 20 m3
of brine. 8
OR
12. a) Hydrochloric acid is an important industrial chemical. To make aqueous
solution of it of commercial grade (called muriatic acid), purified HCl (g) is
absorbed in water in a tantlum absorber in a continuous process. How much
heat is to be removed from the absorber per 100 kg of product if hot HCl (g)
at 120°C is fed into water in the absorber. The feed water can be assumed to
be at 25 °C and the exit product HCl (aq.) is 25% HCl (by wt) at 35°C
Data: Cp for HCl (g) = 29.13 – 0.1341×10–2 T + 0.9715×10–2 T2
where, Cp is in kJ/ (kmol. K) with T in K
Cp for product is approximately 2.7 kJ/ (kg. K) 8
b) A square tank 4 m on a side and 10 m high is filled to the brim with water.
Find the time required for it to empty through a hole in the bottom 5 cm2 in
area. 8
——————
