Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 3rd Sem Chemical Engineering Process Calculations Previous Question Paper
10987 : Process Calculations : 3 CH 05/ 3 PP 05/ 3 CT 05
P. Pages : 3 AW - 2998
Time : Three Hours lwyyil?gi Mam. Marks : 80
Notes :
a)
b)
a)
b)
a)
All question carry marks as indicated.
Answer three question from Section A and three question from Section B.
Due credit will be given to neatness and adequate dimensions.
Assume suitable data wherever necessary.
Diagrams and chemical equations should be given wherever necessary.
Illustrate your answer necessary with the help of neat sketches.
Discuss the reaction, mechanism wherever necessaly.
Use of cell phone is not allowed in the exam.
Use of pen Blue/Black ink/re?ll only for writing the answer book.
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SECTION - A
A chemist is interested in preparing 500 ml of 1 normal, 1 molar and 1 molal solution of
H2804. Assuming the density ofH2804 Solution to be 1.075 g/cm?, calculate the quantities
of H230: to be taken to prepare these solutions.
Spent acid from fertilizer plant has the following composition by weight :
H2804 = 20%, NII4HSO4 = 45%, H20 = 30%, and organic compounds = 5%.
F ind the total acid content of the spent acid in temis oszSO4 after adding the acid content
chemically bound in ammonium hydrogen sulphate.
OR
A sample of a gas having volume of 0.5 m3 is compressed in such a manner so that pressure
is increased by 60%. The operation is done for a ?xed mass of a gas at constant temperature.
Calculate the ?nal volume of the gas.
A gaseous mixture has the following composition by volume :
C02 = 8%, C0 = 14%, 02 = 6%, H20 = 5%, CH4 = 1% and N2 = 66%,
Calculate
1) Average molecular weight of gas miXture.
ii) Density of gas mixture at 303 K and 101.325 kPa
'lhe waste acid from a nitrating process containing 20% HN 03, 55% H2804 and 25% H20
by weight is to be concentrated by addition of cone. H2804 acid containing 95% H2SO4 and
cone. HN03 acid containing 90% HN03 to get desired mixed acid containing 26% HN03
and 60% H2804. Calculate the quantities of waste and concentrated acids required for 1000
kg ofdesired mixed acid.
OR
The ground nut seeds containing 45% oil and 45% Solids are fed to expeller the cake coming
out of expeller is found to contain 80% solids and 5% oil. Find the percentage recovery of
oil.
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b) A feed to a continuous t?ractionating column analyses by weight 28% benzene and 72% 6
toluene. The analysis ofthe distillate shows 52 weight "/6 benzene and 5 weight % benzene
was found in the bottom product. Calculate the amount of distillate and bottom product per
1000 kg of feed per hour. Also calculate the ?/0 recovery of benzene.
In production of chlorine gas by oxidation of hydrochloric acid gas, air is used 30% in 13
excess of that theoretically required. Based on 4 Kmol HCl, calculate
i) the weight ratio of air to hydrochloric acid gas in feed.
ii) If oxidation is 80% complete, ?nd the composition of product stream on mole basis.
0R
Ethylene oxide is prepared by oxidation of ethylene. 100K mole of ethylene and 100K molc l3
01?02 are charged to a reactor.
The percent conversion nt'ethylene is 85 and percent yield of C2H4O is 94.12.
Calculate the composition ofproduct stream leaving the reactor. The reaction taking place
are :
02314 + ?02 ??)C2H4()
C2114 +302 ?-?>2C02 + 21120
SECTION - B
1116 gas having the following composition is at temperature of 775 K : 14
SO; 2 7.09%. Oz : 10.55%, 303 = 0.45% and N2 = 81.91%.
Calculate the heat content 01? 1 Kmol gzu mixture over 298K using the heat capacity data
given below: (:13? = 3+ hT 1 cT2 +dT3 kJ/(Kmol.K)
Gas 3 __ hx103 1310" 0x109
"80; 24.77_06_7 $129481 ?442582 11.122
02 26.0257 1 1.7551 2.3426 ?0.562_3_
_ g1; 22.0376 121.624 ?91.8673 24.3691
N: 29.5909 9?5141 13_.1_829 ?4.968
OR
at A sneam ?owing at a rate 0f l50()0 mobhr containing 25 mole % N2 and 75 mole % H2 is 8
to be heated from 298 K to 473 K. Calculate the heat that must be transferred using C?
data given below :
cg a +b'l'+cT2 +dT3 kJ ,1 (K 11101.1()
1_? V a 1
' G95 3 bx10?_ cx106 1 0x109
N5 29.5909 -;5.41_ 13182914968
H2 28.6105 1.0195 ?0.1476[ 0.769
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b) In a liquid phase heating system, Diphenyl DT is used as a thermic ?uid. The thermic ?uid
enters an indirect ?red heater at a temperature of 453 K and leaves the heater at a
temperature of 533 K. Calculate the heat to be supplied in the heater per kg of the liquid
heated.
Data : The heat capacity of the ?uid is given by
C =1.436+2.18 x10?3T kJ/(kg.K) where Tis inK.
Obtain an empirical equation for calculating the heat of reaction at any temperature T in K
for the reaction : cog) + 2112(g) ???)CH3OH(g)
Data : AHOR = ?90.41 kJ/mol
C3 = a+ bT+ cTz +013 kJ/(KmoLK)
COmPOHCm a bx103 cx106 dx109
com, 29.0277 ?2.8165 11.6437 ?4.7063
?2(2) 28.6105 1.0194 ~0.1476 0.769
L c113o11(g, 21.137 70.843 25.86 ?2s.497
OR
a) Discuss in brief the concept of adiabatic process and adiabatic ?ame temperature.
b) Calculate the standard heat of reaction of the following reaction :
(351112?) + 802(g) -??-) 5C02(g) + 6H20([,)
Data :
Component AH? kJ/mol at 298 K
CsHmt) -1 73.49
com) ?393.51 __
H20?) ~285.83
The ultimate analysis of a residual fuel oil sample is given below :
C = 88.4%, H = 9.4% and S = 2.2% by weight. It is used as a fuel in a power generating
boiler with-25% excess air. Calculate :
a) The theoretical dry air requirement
b) The actual dry air supplied and
c) The orsat analysis of ?ue gases.
OR
a) What do you mean by calori?c value ? Discuss in brief the concept of Net Calori?c Value
(NCV) and Gross Calori?c Value (GCV).
b) A sample of fuel oil has C/H ratio 9.33 (by weight) and contains 1.3% sulphur (weight
basis). The net calori?c value of the fuel oil is 39685 kJ/kg at 298 K. Calculate the gross
calori?c value using latent heat of water at 298 K.
Data : Latent heat of water vapour at 298 K = 2442.5 kJ/kg.
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This post was last modified on 10 February 2020