PBE Flashcards
MEMORIZE AND LEARN
A cyclone separator, 0.3 m in diameter and 1.2 m long, has a circular inlet 75 mm in diameter and an outlet of the same size. If the gas enters at a velocity of 1.5 m/s, at what particle size will the theoretical cut occur? The viscosity of air is 0.018 mN s/m2, the density of air is 1.3 kg/m3 and the density of the particles is 2700 kg/m3.
2.17 × 10−6 m or 2.17 μm
Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(a) voidage
(b) the density of the fluidised bed,
(c) the pressure gradient in the bed attributable to the presence of the particles.
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively. (sa original na tanong given naman yung galileo no.)
e = 0.755
Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(b) the density of the fluidised bed,
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively. (sa original na tanong given naman yung galileo no.)
1367 kg/m3
Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(c) the pressure gradient in the bed attributable to the presence of the particles.
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively. (sa original na tanong given naman yung galileo no.)
3605 (N/m2)/m
A liquid with no appreciable elevation of boiling-point is concentrated in a triple-effect evaporator. If the temperature of the steam to the first effect is 395 K and vacuum is applied to the third effect so that the boiling-point is 325 K, what are the approximate boiling-points in the three effects? The overall transfer coefficients may be taken as 3.1, 2.3, and 1.1 kW/m2 K in the three effects respectively.
381.5K
363.2K
325K
In order to extract acetic acid from dilute aqueous solution with isopropyl ether, the two immiscible phases are passed countercurrently through a packed column 3 m in length and 75 mm in diameter.
It is found that, if 0.5 kg/m2s of the pure ether is used to extract 0.25 kg/m2s of 4.0 per cent acid bymass, then the ether phase leaves the column with a concentration of 1.0 per cent acid by mass. (kg acid/kg isopropyl ether) = 0.3 (kg acid/kg water).
Calculate:
(a) the number of overall transfer units based on the raffinate phase, and
0.461
In order to extract acetic acid from dilute aqueous solution with isopropyl ether, the two immiscible phases are passed countercurrently through a packed column 3 m in length and 75 mm in diameter.
It is found that, if 0.5 kg/m2s of the pure ether is used to extract 0.25 kg/m2s of 4.0 per cent acid bymass, then the ether phase leaves the column with a concentration of 1.0 per cent acid by mass. (kg acid/kg isopropyl ether) = 0.3 (kg acid/kg water).
Calculate:
the overall extraction coefficient based on the raffinate phase.
5.53
Seeds containing 20% by mass of oil, are extracted in a countercurrent plant,and 90% of the oil is recovered in a solution containing 50% by mass of oil. I fthe seeds are extratced by fresh solvent and 1kg of solution is removed in the underflowin association with every 2kg of insoluble matter, how many ideal stages are requried?
5 thickeners
TiCl4 can be formed by reacting titanium dioxide (TiO2) with hydrochloric acid. TiO2 is available as an ore containing 78 % TiO2 and 22 % inerts. The HCl is available as 45 wt% solution (the balance is water). The per pass conversion of TiO2 is 75 %. The HCl is fed into the reactor in 20 % excess based on the reaction. Pure unreacted TiO2 is recycled back to mix with the TiO2 feed. TiO2 + 4 HCl → TiCl4 + 2 H2O For 1 kg of TiCl4 produced, determine: a. the kg of TiO2 ore fed.
see himmelbalau
A pump draws a solution of specific gravity 1.84 from a storage tank through a 3 in. (75-mm) Schedule 40 steel pipe. The efficiency of the pump is 60 percent. The velocity in the suction line is 3 ft/s (0.914 m/s). The pump discharges through a 2-in. (50-mm) Schedule 40 pipe to an overhead tank. The end of the discharge pipe is 50 ft (15.2 m) above the level of the solution in the feed tank. Friction losses in the entire piping system are 10 ft lbf/lbm (29.9 J/kg). What pressure must the pump develop? What is the power delivered to the fluid by the pump?
see mccabe and smith
The synthesis of ammonia proceeds according to the following reaction N2 + 3 H2 —–> 2 NH3 In a given plant, 4202 lb of nitrogen and 1046 lb of hydrogen are fed to the synthesis reactor per hour. Production of pure ammonia from this reactor is 3060 lb per hour. a. What is the limiting reactant. b. What is the percent excess reactant. c. What is the percent conversion obtained (based on the limiting reactant).
see himmelblau?
What unit operation originated in Trona Process?
crystallization
Based on the following reactions, choose the Hagreave’s process.
Production of Sodium Sulfate (Na2SO4)
In the calculation of the compressibility factor, which of the following equations apply for a high pressure condition
Z=1 + BP/RT
If the concentration of the reactant increases, the half life decreases, what order of the reaction is this?
2nd Order Reaction
Which of the following is the reaction time is directly proportional to the concentration of the reactant?
zero order
Which of the following process uses the MIMO system in controlling their process parameter?
distillation column
How is the fluctuation in the process is controlled?
Equipping the instrument with integral controller
What do yu call the temperature in which the reactor condition cannot be controlled?
runaway temperature
A mixture of water and ethyl alcohol containing 0.16 mole fraction alcohol is continuously distilled in a plate fractionating column(Problem 11.3) … Determine number of theoretical plates.
see problem 11.3
10Mg of a solution containing 0.3kg Na2CO3/kg solution is cooled slowly to 293K to form crystals of Na2CO3X10H20. What is the yield of crystals…
6536 kg
Hydrogen is pumped from a reservoir at 2MN/m2 pressure through a clean horizontal mildsteel pipe 50mm diameter and 500 m long. what is the flowarate?
0.213kg/s
Hydrogen is pumped from a reservoir at 2MN/m2 pressure through a clean horizontal mildsteel pipe 50mm diameter and 500 m long. What is the effective rate?
113kw
Tests on a small scale tank 0.3m diameter (Rushton Impeller, diameter 0.1m) have shown that a blending process…
a.) what speed should be chosen for the larger impeller
0.346Hz/ 20.8 rev/min
Tests on a small scale tank 0.3m diameter (Rushton Impeller, diameter 0.1m) have shown that a blending process…
b) What power will be required?
9.8 W
Tests on a small scale tank 0.3m diameter (Rushton Impeller, diameter 0.1m) have shown that a blending process…
c. What will be the blend time in the large tank
1.15min
600L/s of water at 320K is pumped through in a 40mm inside diameter pipe through lengthof 150m in a horizontal direction up through a vertical height…what power must be delivered to the pump if it is 60% efficient?
128W
MW OF SUCROSE
C12H22O11-342.3
Definition of henrys law
states that the amount of dissolved gas is proportional to its partial pressure in the gas phase
Given pH of dolomite=6.6, if pH becomes 5.6, what is the concentration of Calcium and Magnesium?
see this problem
Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process.
Reaction: H2O + SO3 –> H2SO4
(a) Calculate the amount of 95.9% H2SO4 used in tons/day (choices are in lbs)
see this problem
Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process.
Reaction: H2O + SO3 –> H2SO4
(b) Calculate the 97.3% H2SO4 used in tons/day (choices are in lbs)
see
Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process.
Reaction: H2O + SO3 –> H2SO4
(c) Amount of 98% H2SO4 produced in ton/day (choices are in lbs)
see
Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate.
(a) What is the amount of sulfur in the feed if 980 kg of bisulfate was produced?
see
Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate.
(b) How much caustic soda was used?
see
Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate.
(c) How much SO2 was produced?
see
Water at 45degC and 10 kPa enters an adiabatic pump and is discharged at a pressure of 8600 kPa. Assume the pump efficiency to be 0.75.
Data: V=1010 cm3/g, Volume Expansivity (beta) = 425 x10-6 /K and Cp=4.178 kJ/kg-K
Calculate the following:
(a) work of the pump
11.57kj/kg
Water at 45degC and 10 kPa enters an adiabatic pump and is discharged at a pressure of 8600 kPa. Assume the pump efficiency to be 0.75.
Data: V=1010 cm3/g, Volume Expansivity (beta) = 425 x10-6 /K and Cp=4.178 kJ/kg-K
Calculate the following:
(b) temp change of water
(c) entropy change
0.97C, 0.009KJ/Kg K
- 4 m3/s flowrate from a tank is to be delivered to another tank. Using parallel flow, d1=0.6m and d2=0.4m. Use f=1/(1/4 x Re).
(a) What is the velocity at d1?
(b) What is the velocity at d2?
(c) What is the diameter if one pipe is used?
see
Example of pseudo plastic fluid
a. apple sauce c. tap water
b. rubber latex d. sewage sludge
apple sauce
Process of breaking down a large isotope into smaller isotopes.
nuclear fission
Red Lead
Pb3O4
Can oxygen be synthesized from nitrogen?
impossible
Author of octet rule
(Gilbert Lewis)
How does alpha, beta and gamma particle affect the mass number of an atom?
4,0,0
Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described?
sublimation
Notation on alkane containing Cl
chloro
Given: Dodecane I. Is it soluble in water? II. Is it soluble in hexane? III. Is it combustible? IV. Is it solid, liquid or gas at room temp. & atmospheric conditions? V. Is it denser than water?
no, yes, yes, liquid, less dense
Characteristics of elements under group 1A
Has 1 electron on its outer most energy level
tank is half filled with water, if N2 =1.02 moles and H20 =1.02 moles. What happens to the N2 when dissolved in water? a. increase b. decrease Page 2 c. remains the same d. none of these
solve
Description of a primary and a secondary cell
A primary cell can be recharged while secondary cannot, Ni-Cd is a primary cell, a dry cell is a secondary cell.
Adolf Baeyer’s contribution in medicine, made by reacting malonic acid and urea with a catalyst is called
barbituric acid
Composition of acid in acid rain?
nitric and sulfuric
Which of the ff has a higher heat of combustion on a gram per gram basis if Hf is 237 kj/mol and 532 kj/mol for methane and propane respectively? (
methane)
How to differentiate alkane alkene and alkyne?
rxn with Br2
Which of the ff. has a larger ionic nucleus? Na+ or Na?
Na
What happens to the melting point of a saturated fatty acid if -CH2- increase?
increase
Formula of alar
(C6H12N2O3)
Particle with the same mass as proton.
(neutron
Arrange in increasing level of toxicity
1: heptachlor 2: dieldrum 3: DDT 4: Arsenic 5: Cr
Polymer used in bullet proof vest
polyarylonitrile
Other term of earth wax
(ozocerite)
Other name of Yamatake system (process automation - DCS)
azbil
What is used in ultrasonic flow meters
(In HB. Doppler)
Which of the following is not dependent on temperature and wavelength?
black body
Electronic noise inside an electric conductor which is independent of applied voltage
johnson noise
Difference between measured value and set point
error
Which of the ff industries( stated in the question that the industry itself is a power plant) produces electricity aside from its main product.
a. oil refinery
b. sugar industry
c. biomass industry
b. sugar industry
