INTRO.TO CHEM.ENGR.THERMO.-EBOOK>I<
8th Edition
ISBN: 9781260940961
Author: SMITH
Publisher: INTER MCG
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Chapter 14, Problem 14.14P
The following reaction, hydrogenation of styrene to ethylbenzene, reaches equilibrium at 650°C and atmospheric pressure:
If the system initially contains 1.5 mol H2 for each mole of styrene (
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Two rods (fins) having same dimensions, one made of brass(k=85 m
K) and the other of copper (k = 375 W/m K), having one of their ends inserted
into a furnace. At a section 10.5 cm a way from the furnace, the temperature
brass rod 120°C. Find the distance at which the same temperature would be
reached in the copper rod ? both ends are exposed to the same environment.
22.05
ofthe
4.59
Using the unilateral z-transform, solve the following difference equations with the given initial
conditions.
(a) y[n]-3y[n-1] = x[n], with x[n] = 4u[n], y[− 1] = 1
(b) y[n]-5y[n-1]+6y[n-2]= x[n], with x[n] = u[n], y[-1] = 3, y[-2]= 2
Ans. (a) y[n] = -2+9(3)", n ≥ -1
(b) y[n]=+8(2)" - (3)", n ≥ -2
(30)
6. In a process design, the following process streams must be cooled or heated:
Stream
No
mCp
Temperature In Temperature Out
°C
°C
kW/°C
1
5
350
270
2
9
270
120
3
3
100
320
4
5
120
288
Use the MUMNE algorithm for heat exchanger networks with a minimum approach
temperature of 20°C.
(5)
a. Determine the temperature interval diagram.
(3)
(2)
(10)
(10)
b. Determine the cascade diagram, the pinch temperatures, and the minimum hot and
cold utilities.
c. Determine the minimum number of heat exchangers above and below the pinch.
d. Determine a valid heat exchange network above the pinch.
e. Determine a valid heat exchange network below the pinch.
Chapter 14 Solutions
INTRO.TO CHEM.ENGR.THERMO.-EBOOK>I<
Ch. 14 - Prob. 14.1PCh. 14 - A system initially containing 2 mol C2H4 and 3 mol...Ch. 14 - A system formed initially of 2 mol CO2 , 5 mol H2...Ch. 14 - Consider the water-gas-shift reaction:...Ch. 14 - Rework Prob. 14.4 for a temperature of: (a) HOOK:...Ch. 14 - Use the method of equilibrium constants to verify...Ch. 14 - Prob. 14.7PCh. 14 - For ideal gases, exact mathematical expressions...Ch. 14 - For the ammonia synthesis reaction written:...Ch. 14 - Peter. Paul, and Mary, members of a thermodynamics...
Ch. 14 - The following reaction reaches equilibrium at...Ch. 14 - The following reaction reaches equilibrium at...Ch. 14 - The following reaction reaches equilibrium at...Ch. 14 - The following reaction, hydrogenation of styrene...Ch. 14 - The gas stream from a sulfur burner is composed of...Ch. 14 - Prob. 14.16PCh. 14 - Ethylene is produced by the dehydrogenation of...Ch. 14 - The production of 1,3-butadiene can be carried out...Ch. 14 - The production of 1,3-butadiene can be carried out...Ch. 14 - For the ammonia synthesis reaction, 12N2g+32H2NH3g...Ch. 14 - Prob. 14.21PCh. 14 - Prob. 14.22PCh. 14 - Ammonium chloride NH4Cls decomposes upon heating...Ch. 14 - A chemically reactive system contains the...Ch. 14 - The relative compositions of the pollutants NO and...Ch. 14 - Carbon black is produced by the decomposition of...Ch. 14 - Consider the reactions 12N2g+12O2gNOg12N2g+O2gNO2g...Ch. 14 - Oil refineries often have both H2S and SO2 to...Ch. 14 - Species N2O4 and NO2 as gases come to equilibrium...Ch. 14 - The following isomerization reaction occurs in the...Ch. 14 - Prob. 14.32PCh. 14 - The feed gas to a methanol synthesis reactor is...Ch. 14 - Prob. 14.34PCh. 14 - Consider the gas-phase isomerization reaction: ....Ch. 14 - A low-pressure, gas-phase isomerization reaction,...Ch. 14 - Set up the equations required for solution of Ex....Ch. 14 - Reaction-equilibrium calculations may be useful...Ch. 14 - Ethylene oxide as a vapor and water as liquid,...Ch. 14 - In chemical-reaction engineering, special measures...Ch. 14 - The following problems involving chemical-reaction...Ch. 14 - The following is an industrial-safety rule of...Ch. 14 - Prob. 14.43PCh. 14 - The standard heat of reaction A/f3 for gas-phase...Ch. 14 - Ethanol is produced from ethylene via the...Ch. 14 - A good source for formation data for compounds is...Ch. 14 - Reagent-grade, liquid-phase chemicals often...Ch. 14 - Cracking propane is a route to light olefin...Ch. 14 - Equilibrium at 425 K and 15 bar is established for...
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- Example (6): An evaporator is concentrating F kg/h at 311K of a 20wt% solution of NaOH to 50wt %. The saturated steam used for heating is at 399.3K. The pressure in the vapor space of the evaporator is 13.3 KPa abs. The 5:48 O Transcribed Image Text: Example (7): Determine thearrow_forward14.9. A forward feed double-effect vertical evaporator, with equal heating areas in each effect, is fed with 5 kg/s of a liquor of specific heat capacity of 4.18 kJ/kg K. and with no boiling point rise, so that 50 per cent of the feed liquor is evaporated. The overall heat transfer coefficient in the second effect is 75 per cent of that in the first effect. Steam is fed at 395 K and the boiling point in the second effect is 373 K. The feed is heated by an external heater to the boiling point in the first effect. It is decided to bleed off 0.25 kg/s of vapour from the vapour line to the second effect for use in another process. If the feed is still heated to the boiling point of the first effect by external means, what will be the change in steam consumption of the evaporator unit? For the purpose of calculation, the latent heat of the vapours and of the steam may both be taken as 2230 kJ/kgarrow_forwardExample(3): It is desired to design a double effect evaporator for concentrating a certain caustic soda solution from 12.5wt% to 40wt%. The feed at 50°C enters the first evaporator at a rate of 2500kg/h. Steam at atmospheric pressure is being used for the said purpose. The second effect is operated under 600mmHg vacuum. If the overall heat transfer coefficients of the two stages are 1952 and 1220kcal/ m2.h.°C. respectively, determine the heat transfer area of each effect. The BPR will be considered and present for the both effect 5:49arrow_forward
- العنوان ose only Q Example (7): Determine the heating surface area 개 required for the production of 2.5kg/s of 50wt% NaOH solution from 15 wt% NaOH feed solution which entering at 100 oC to a single effect evaporator. The steam is available as saturated at 451.5K and the boiling point rise (boiling point evaluation) of 50wt% solution is 35K. the overall heat transfer coefficient is 2000 w/m²K. The pressure in the vapor space of the evaporator at atmospheric pressure. The solution has a specific heat of 4.18kJ/ kg.K. The enthalpy of vaporization under these condition is 2257kJ/kg Example (6): 5:48 An evaporator is concentrating F kg/h at 311K of a 20wt% solution of NaOH to 50wt %. The saturated steam used for heating is at 399.3K. The pressure in the vapor space of the evaporator is 13.3 KPa abs. The 5:48 1 J ۲/۱ ostrarrow_forwardExample 8: 900 Kg dry solid per hour is dried in a counter current continues dryer from 0.4 to 0.04 Kg H20/Kg wet solid moisture content. The wet solid enters the dryer at 25 °C and leaves at 55 °C. Fresh air at 25 °C and 0.01Kg vapor/Kg dry air is mixed with a part of the moist air leaving the dryer and heated to a temperature of 130 °C in a finned air heater and enters the dryer with 0.025 Kg/Kg alry air. Air leaving the dryer at 85 °C and have a humidity 0.055 Kg vaper/Kg dry air. At equilibrium the wet solid weight is 908 Kg solid per hour. *=0.0088 Calculate:- Heat loss from the dryer and the rate of fresh air. Take the specific heat of the solid and moisture are 980 and 4.18J/Kg.K respectively, A. =2500 KJ/Kg. Humid heat at 0.01 Kg vap/Kg dry=1.0238 KJ/Kg. "C. Humid heat at 0.055 Kg/Kg 1.1084 KJ/Kg. "C 5:42 Oarrow_forwardQ1: From the Figure below for (=0.2 find the following 1. Rise Time 2. Time of oscillation 3. Overshoot value 4. Maximum value 5. When 1.2 which case will be? 1.6 1.4 1.2 12 1.0 |=0.8- 0.6 0.4 0.8 0.2- 0.6 0.4 0.2 1.2 = 1.0 0 2 4 6 8 10 10 t/Tarrow_forward
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