This download link is referred from the post: SGBAU B.Pharm Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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B.Tech. Eighth Semester Examination
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11675 : Chemical Reaction Engineering-II : 8 CH 02Pages : 4
Time : Three Hours
Max. Marks : 80
Notes:
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- Answer three questions from Section A and three questions 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 necessary.
- Use of pen Blue/Black ink/refill only for writing the answer book.
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SECTION - A
- a) A pulse input to a vessel gives the results shown in Fig.
- Check the material balance with the tracer curve to see whether the results are consistent.
- If the result is consistent, determine t, V and sketch the E curve.
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v = 4 liters/min
b) A batch of radioactive material is dumped into the Columbia River at Hanford, Washington.
At Bonneville Dam, about 400 km downstream the flowing waters (6000 m³/s) are monitored
for a particular radioisotope and the data of Fig. are obtained.- How many units of this tracer were introduced into the river?
- What is the volume of Columbia River waters between Bonneville Dam and the point of introduction of tracer?
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C, units of radioactivity/m³
20 35 125 - a) Dispersed noncoalescing droplets react (A → R, -rA = kCA, k = 0.5 liter/mol.min) as they pass through a contractor. Find the average concentration of A remaining in the droplets leaving the contactor if their RTD is given by the curve in Fig.
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b) Explain the fitting the Dispersion model for small Extents of dispersion, D/ul < 0.01 and large deviation from plug flow, D/ul > 0.01. - The concentration of reactants and products for the reaction A (g) + aB(s) = solid product for a particle of unchanging size, use SHRINKING-CORE MODEL FOR SPHERICAL PARTICLES OF UNCHANGING SIZE. Obtain the relationship of time with radius and with conversion in which the
- Chemical Reaction controls.
- Ash layer controls.
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Hydrogen sulfide is removed from coal gas by passing the gas through a moving bed or iron oxide particles. In the coal gas environment (Consider uniform) the solids are converted from Fe₂O₃ to FeS by the SCM/reaction control, t=1 hr. Find the fractional conversion of oxide to iron sulfide if the RTD of solids in the reactor is approximated by the E curves of
E
3 min - In Fluid-Fluid Reactions discuss the eight special cases, that is from infinitely fast to very slow reaction. Obtain the rate equation for case B. (Infinitely fast reaction with high CB.)
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We wish to lower the concentration of B in the liquid (Vl = 1.62m³, CB0 = 55555.6mol/m³) of an agitated tank reactor by bubbling gas (Fg = 9000mol/hr, π = 105Pa) containing A (PAin = 1000Pa) through it. A and B react as follows:
A(g → l) + B(l) → product (l), -rB = kCACB.
a) How long must we bubble gas through the vessel to lower the concentration from CB0 = 555.6 to CBf = 55.6mol/m³?
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- b) percent of entering A unreacted
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c) Additional data
KLa = 0.72mol/hr.m².Pa, ε = 0.9m³ liquid /m³ total
Kga = 144hr-1, DA = DB = 3.6x10-9m²/hr, a = 100 m²/m³
HA = 105Pa.m³ / mol k = 2.6x10-6m³/mol - hr
CT = 55655.5 mol/m³--- Content provided by FirstRanker.com ---
CB0 = 555.6 mol/m³ at t=0
CBf = 55.6 mol/m³ at t = ?
Fg = 900 mol/hr
π = 105Pa
PAin = 1000 Pa--- Content provided by FirstRanker.com ---
Vl = 1.62m³
SECTION - B
- a) Explain the method for determination of Surface Area of catalyst.
b) Explain the concept of catalyst deactivation.
c) Define Promoters & Inhibitors in solid catalysts.
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a) Explain the method for determination of pore volume of a catalyst particle.
b) A hydrogenation catalyst is prepared by soaking alumina particles (100 to 150 mesh size) in aqueous NiNO₃ Solution. After drying and reduction the particles contain about 7 wt % NiO. This catalyst is then made into large cylindrical pellets for rate studies. The gross measurements for one pellet are
Mass = 3.15g
Diameter = 1.00 in
Thickness = 1 in--- Content provided by FirstRanker.com ---
Volume = 3.22 cm³
The Al₂O₃ particles contain micropores, and the pelleting process introduces macropores surrounding the particles. From the experimental methods already described the macropore volume of the pellet is 0.645 cm³ and the micropore volume is 0.40 cm³/g of particles. From this information calculate:
a) The density of the pellet.
b) The macropore volume in cubic centimeters per gram.
c) The macropore void fraction in the pellet.--- Content provided by FirstRanker.com ---
d) The micropore void fraction in the pellet. - The following kinetic data are obtained in an experimental Carberry type basket reactor using 100gm of catalyst in the paddles and different flow rates from run to run :
Fpg,mol/min 0.14 0.42 1.67 2.5 1.25 CA0=10mol/m³ CAf mol/m³ 8 6 4 2 1
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- Determine the amount of catalyst needed in a packed bed reactor to treat FA0 = 1000 mol A/min of a CA0 = 8 mol/m³ feed.
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OR
The catalytic reaction
A → 4R
is studied in a plug flow reactor using various amounts of catalyst and 20 liters/hr of pure A feed at 3.2 atm and 117°C. The concentrations of A in the effluent stream is recorded for the various runs as follows.
Run 1 2 3 4 Catalyst used, kg 0.020 0.040 0.080 0.160 CAout-mol/liter 0.074 0.060 0.044 0.029 --- Content provided by FirstRanker.com ---
Find the rate equation for this reaction using the integral method of analysis - The first-order decomposition of A is run in an experimental mixed flow reactor. Find the role played by pore diffusion in these runs; in effect determine whether the runs were made under diffusion-free, strong resistance, or intermediate conditions.
dp W CA0 v XA 2 4 75 10 0.2 6 100 5 0.6
OR
The following kinetic data on the reaction A → R are obtained in an experimental packed bed reactor using various amounts of catalyst and a fixed feed rate FA0 = 10k mol/hr.--- Content provided by FirstRanker.com ---
(W,kgcat 1 2 3 4 5 6 7 XA 0.12 0.20 0.27 0.33 0.37 0.41 0.4 - Find the reaction rate at 40% conversion.
In designing a large packed bed reactor with feed rate F0 = 400 k mol/hr how much catalyst would be needed for 40% conversion.
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This download link is referred from the post: SGBAU B.Pharm Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university