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Question 1.
The overhead reflux drum for a vacuum column in an oil refinery operates at 25 mmHg. The overhead temperature is 120°F, and the composition and flowrate of the vapor in the vent gas (not including any air leaks) is
H2 = 1.2 lb/h
CH4 = 20 lb/h
C2H6 = 45 lb/h
C3H8 = 25 lb/h
The vacuum tower and associated equipment and pipes have an approximate volume of 21,000 ft3.
a. Estimate the air leak into this ("tight") system.
b. Determine how many stages would be required for a steam ejector to remove the vent gas plus the air leak into the system and deliver it to a vent gas handling system operating at 1.2 bar.
c. Estimate the amount of low-pressure steam (70 psig saturated) required by each stage of ejector assuming there is no intermediate condensation.
d. If cooling water is available at 86°F and must be returned to the cooling tower at 104°F, determine if a partial condenser could be employed and where it should be placed. Also determine if more than one condenser could be employed.
e. Determine the amount of steam required if a single partial condenser is used. You should assume that the condenser is placed between the two stages of the ejector and a temperature approach of 10°F is used.
Find the density of liquid methane in a handbook and compare your answer to the tabulated value.
Steam at 2700 kPa and with a quality of 0.90 undergoes a reversible, adiabatic expansion in a nonflow process to 400 Ha. It is then heated at constant volume until it is saturated vapor. Determine Q and W for the process.
(a) Calculate the vapor pressure of toluene and benzene for the gas stream leaving the system.
Determine the electromagnetic force on the plunger by the application of Equations (12.4.19) and (12.4.20). Interpret the significance of the sign that you obtain in the force expression.
The total capital investiment for a chemical plantis $1 million, and the working capital is $100,000. if the plant can produce an average of 8000kg of fixed product per dayduring 365-day per year, what selling price in dollars per kilogram?
Confirm by means of the second derivative that the cost equation will reach a minimum when this many operations are performed.
Before developing the dead-weight gauge, he worked in a mine shaft, and used a mercury manometer for measurements of pressure to more than 400 bar. Estimate the height of manometer required.
Derive the Langmuir equation using the reaction of elemental hydrogen and sulfur to form hydrogen sulfide.
Compute the theoretical density of diamond given that the C-C distance and bond angle are 0.154 nm and 109.5°, respectively. How does this value compare with the measured density?
Overall heat transfer coefficient is 3000 W m2 K. Calculate the heating surface required in calandra in m2 and the economy of the evaporator.
questiona personal protective equipment are only used when it has proven impractical to control occupational hazards by
After World War II, Cold war tensions increased among nations. Identify elements or events that increased tensions between the United States and Soviet Union
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