A mixture of propane, butane and pentane are to be separated in a distillation column. Feed= Propane - 20 wt % Butane - 50 wt% Pentane - 30wt%. Top=Propane – 93 wt% Butane - 7 wt% Pentane – 0 wt%. Bottom=Propane - ?? wt % Butane - ?? wt% Pentane - 38 wt%. The weight % values shown are compositions. The total feedrate is 5000 kg hr-1. ALL the pentane is recovered in the bottom product, (comprising 38 wt% of the composition of that stream), determine the following:
(a) The total mass flowrates of each of the top and bottom product streams.
(b) The percentage recovery of the propane in the top product
In: Other
In one process there is a throttle valve through which water vapor is passed in a superheated state, the valve operates in a steady state at P = 100 kPa and T = 250 ºC. The pressure of the fluid leaving the valve is 50 kPa. An engineer suggested replacing the valve with a turbine, this in order to get a turbine job. I. Determine the physical state of the fluid leaving the valve and the temperature. II.Determine the speed at which entropy is generated in the valve per kilogram of water that enters.III.Determine the maximum work that can be produced by a turbine per kilogram of water that enters if the current that enters the turbine is identical to the current entering the valve and the outlet pressure of the turbine is P = 50 kPa.
In: Other
An ideal benzene toluene mixture contains 6 moles of benzene and 4 moles of toluene at 25 ° C. The saturated vapor pressure of pure benzene at 25 ° C is 96 Torr, the saturated vapor pressure of pure toluene is 29 Torr. Initially, the mixture at 760 Torr pressure is only liquid. The total pressure is then slowly reduced to a pressure of 60 Torr. Calculate the composition of liquid phase and vapor phase, and calculate liquid and vapor mole fractions.
In: Other
A 15% Na2SO4 solution is fed at a rate of 5.5 kg/min into a mixer which initially holds 45.5 kg of a 50-50 mixture of Na2SO4 and water. The exit solution leaves the mixer at a rate of 4.5 kg /min. Assuming uniform mixing, write the required mass balances and calculate the weight fraction of Na2SO4 in the mixer at the end of 10 min using 4th order Runge-Kutta Method by taking Δt= 0.5 min.
Solve the question using Excel
In: Other
Material Balance, Water removal
A 2000 kg batch of pharmaceutical-grade powder containing 7.5% by
weight water is dried in a drier.
After drying, 95% of the water that enters with the wet powder will
have been removed from the powder.
a. Draw a diagram of the process. Label ALL streams and indicate
stream compositions. Use proper
notations and units.
b. State a basis.
c. Perform an overall material balance and a material balance for
each species.
d. Calculate the final batch composition in wt.%
e. Calculate the final weight of the dried powder (lbm) and the
weight of the water removed (lbm).
Show all work
In: Other
It is desired to use a rotary vacuum filter to separate slurry containing 20 kg of water per kilogram of solid material. Tests on the rotary filter at the conditions to be used for the filtration have indicated that the dimensionless ratio α/β' is 0.6 and 19 kg of filtrate (not including wash water) is obtained for each 27.8 kg of slurry. The temperature and pressure of the surroundings are 25 oC and 1 atm, respectively. The pressure drop to be maintained by the vacuum pump is 45 kPa. The fraction of the drum area submerged in the slurry is 0.3 and the fraction of the drum area available for suction is 0.1. On the basis of the following assumptions, estimate the kilowatt rating of the motor necessary to operate the vacuum pump if the filter handles 16000 kg/h of slurry. Assumptions are as follows:
Resistance of the filter medium is negligible.
Effects of air leakage are included in the value given for α/β'.
The value of β' is based on the temperature and pressure of the ambient air.
The filter removes all the solids from the slurry.
The vacuum pump operates isentropically with an overall efficiency of 50 percent for the pump and motor.
The ratio of Cp/Cv remains constant at a value of 1.4.
In: Other
In this activity, you will develop an experimental procedure to solve a problem. Consider the following scenario: You are the manager of a chemical stockroom, and find a bottle containing approximately one liter of a clear and colorless solution of unknown identity and concentration. Your only clue to its identity is that it was found between bottles of silver fluoride and sodium fluoride, so it is likely an aqueous solution of one of those two compounds. You will need to develop a procedure to determine the following: a) The identity of the unknown solution b) The concentration of the unknown solution Write out a precise procedure, which includes all glassware, reagents, and steps. You will also need to write the calculations that you would need to determine the concentration of the solution. Assume that you have access to all of the equipment that you used in the chemistry lab this semester and any reagent you might need.
How would I find the concentration if the 1L bottle would be sodium fluoride or NaF?
In: Other
In using my propane powered grill the other day (nice day, 65°F) I noticed the metal cylinder holding the propane had frost forming on it. Why?
In: Other
7. Adsorption of an organic solute on activated silica gel gave the following data after equilibrium. S (mg cm-3) 0.139 0.089 0.066 0.047 0.037 Ca (mg/g) 0.03 0.026 0.0225 0.021 0.018 Fit the data to an adsorption isotherm and calculate the constants.
In: Other
In: Other
Design a sulfuric acid plant with a capacity of 8 ton per day. The product is to have a purity of 96% acid. Label all streams
In: Other
In: Other
what is the SOP for continuous fluidized bed dryer? and how to do the maintenance and cleaning?
In: Other
An absorption column (1st unit) and a stripping tower (2nd unit)
are used in a separation process
to separate gas mixtures that contains 35 mol% CO2 and the balance
methane (CH4). The gas
mixture is fed to the bottom of absorption column where in the
column, the gas mixture is
contacted with a recycled solvent. The contacting solvent stream
contains 0.45 mol% dissolved
CO2 in methanol (CH3OH), which is recycled from the bottom of the
stripping tower and enters
the absorption column at the top. The product gas stream leaving
the top of absorption column
contains 1 mol% CO2 and 99 mol% methanol, where all methanol fed to
the column exits in
this stream.
The liquid bottom stream of the absorption column which is rich in
CO2 is fed to the top of the
stripping tower while a stream of nitrogen gas at a flow rate of
100 mol/h is fed to the bottom.
90% of carbon dioxide in the liquid solvent fed to the stripping
tower is stripped off and exits
the tower together with the entire nitrogen fed. This stream is
released to the atmosphere
through a stack. As mentioned above, the liquid stream leaving the
stripping tower is the
recycled solvent stream of CO2 –methanol solution fed to the
absorption column.
There are two assumptions made in this separation process where
firstly, no methanol enters
as vapor phase in both columns as it is assumed to be non-volatile.
Another assumption is that
nitrogen is insoluble in methanol. By taking 100 mol/h of gas
mixture fed to the absorption
column as the basis of calculation,
a) With the support of a complete process flow chart, determine all
flow rates and
compositions entering and leaving the stripping tower.
In: Other
the explain application of the stability of the phases
In: Other