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Benzene is to be absorbed from coal gas by means of a wash oil. The inlet gas contains 3% by volume of benzene, and the exit gas should not contain more than 0.02% benzene by volume. The suggested oil circulation rate is 5 kg oil per 1m3 of inlet gas measured at STP. The wash oil enters the tower solute free and the operation is carried out at atmospheric pressure.
The RMM for benzene is 78 and the equilibrium data are:
Benzene in oil (% by wt)
0.05 0.01 0.5 1.0 2.0 2.5 3.0
Equilibrium partial pressure of benzene in gas (mbar)
0.15 0.31 2.0 5.3 13.3 21.4 33.4
The setting velocity of a particle is 0.002 m/s and the overflow rate of a settling tank is 0.008 m/s. (a) what percent of the particles does the settling tank capture. If the particles are flocculated so that thie rsettling rate is 0.05 m/s
Water flows in a 100-m long pipe at 3 m/s. If the water temperature is 20 degrees C, determine the minimum valve-closure time to avoid creating the water-hammer pressures. What is the maximum water-hammer pressure that can occur
A 2 m high sandy fill material was placed loosely at a relative density of 47%. Laboratory studies indicated tht the maximum and minimum void ratios of the fill material are 0.92 and 0.53, respectively.
If the superelevation is .10 at the station of the PC is 17+35, what is the station of the PI and how much distance must be cleared from the center of the lane to provide adequate stopping sight distance
find the inertia tensor about the origin for a mass of uniform density=1,inside the part of the unit sphere where x>0,y>0,and find the principal moments of inertia and the principal axes.
A 8 inch polyethylene pipe has a flow rate of 1000 gallons/minute with a linear length of 10000ft. Starting at elevation 200ft then ends at 600ft elevation. Initial pressure is 40 psi. find the friction and the head loss.
A sample of natural glacial till was taken from below the groundwater table. The water content was found to be 52%. Estimate the wet density,dry density,buoyant density,porosity,and void ratio. Clearly state any necessary assumptions.
The rate constant for decay of contaminant A in the reservoir is k=1.5 (1/year). Assuming the population, discharge rate, and reservoir conditions have been stable for a long time, estimate the concentration of A in the reservoir.
A 50 mg-50 Pb alloy is cooled slowly from 700 C to room temperature, a) Calculate the mass fractions of the phase present at 700 C
Average pore water pressure in fully saturated clay specimien, which was subjected to a pressure of 20N/cm^2 initially, was measured to be 7N/cm^2 after a period of time.
A pressurized steel tank has a radius r=0.6m, a wall thickness t=18mm and an internal pressure p of 2.8 MPa.The steel has a modulus of elasticity E of 200 GP and a poissons ratio 0.30.
A channel of a rectangular section is to take a certain discharge Q at critical flow; prove that for the wetted perimeter, P=b+2y to be minimum, the water depth must be three-quarters of the width
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