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Chemical Engineering
Q.4 A 50:50 mixtures (by mass) of ethanolamine (DEA)- triethanolamine (TEA) is distilled in a packed tower
to produce a 99% (by mass) DEA distillate product and 95% (by mass) TEA bottom product. To preclude
the thermal degradation of the amine solution, the absolute pressure in the reboiler must be limited to
1.33kPa (10 torr). The reflux ratio is 0.8 kmol/kmol distillate product. Compute the overall material and
energy balances for 10, 000 kg/h feed, assuming (i) no heat loss to the surroundings, and (ii) negligible
heat of mixing.
Data on DEA and TEA:
to produce a 99% (by mass) DEA distillate product and 95% (by mass) TEA bottom product. To preclude
the thermal degradation of the amine solution, the absolute pressure in the reboiler must be limited to
1.33kPa (10 torr). The reflux ratio is 0.8 kmol/kmol distillate product. Compute the overall material and
energy balances for 10, 000 kg/h feed, assuming (i) no heat loss to the surroundings, and (ii) negligible
heat of mixing.
Data on DEA and TEA:
Chemical Engineering
The gross heating value (GHV) of gaseous propane at 298 K is 2219.71 kJ/mol. Calculate the net heating value (NHV) of the propane. Given that, the latent heat of water vapours at 298 K=2442.5 kJ/kg.
Chemical Engineering
Normal Octane (CH18) undergoes an isobaric process (P = 12.4 bar) during which its temperature increases from 568.8 K to 739.44 K. Determine the change in the molar enthalpy and molar entropy of the system using the following methods (to account for non-ideal behavior):
a) Van der Walls EOS
b) Departure functions
Chemical Engineering
A hot rolled steel section tus the size HSS 10% Describe the cross-sectional shape of the member State what each number represent include units)
For the tooltat press ALT+F10 PC) or ALT FN-F10 (Mac)
For the tooltat press ALT+F10 PC) or ALT FN-F10 (Mac)
Chemical Engineering
A gas cylinder contains N2 at 200 kPa and 80°C. As a result of cooling at night the pressure in the cylinder drops to 190 kPa and the temperature to 30°C. How much work was done on the gas?
Chemical Engineering
A series circuit contains a resistor with R = 40Ω, an inductor with L = 2 H, a capacitor with 0.0025 F, and a 12 − V battery. The initial charge is Q = 0.001 C and see the initial current is 0. Using the method of undetermined coefficients, find the charge at time t
Chemical Engineering
series circuit contains a resistor with R = 40Ω, an inductor with L = 2 H, a capacitor with
0.0025 F, and a 12 − V battery. The initial charge is Q = 0.001 C and the initial current is
0. Using the method of undetermined coefficients, find the charge at time t
0.0025 F, and a 12 − V battery. The initial charge is Q = 0.001 C and the initial current is
0. Using the method of undetermined coefficients, find the charge at time t
Chemical Engineering
0.05 kg of steam at 10 bar, dryness fraction 0.84, is heated reversibly in a rigid vessel until the pressure is 20 bar. Calculate the change of entropy and the heat supplied.
Chemical Engineering
Acetone is used in the manufacture of many chemicals and also as a solvent. In its latter role, many restrictions
are placed on the release of acetone vapor to the environment. You are asked to design an acetone recovery
system having the flowsheet illustrated below. All the concentrations shown in the figure of both gases and
liquids are specified in weight percent in this special case, to simplify calculations. Calculate A, F, W, B and D,
per hour
are placed on the release of acetone vapor to the environment. You are asked to design an acetone recovery
system having the flowsheet illustrated below. All the concentrations shown in the figure of both gases and
liquids are specified in weight percent in this special case, to simplify calculations. Calculate A, F, W, B and D,
per hour
Chemical Engineering
The process flow diagram above resembles a three stage separation circuit. The ratio P3/D3 is 3, the
ratio P2/D2 is 1 and the ratio of A to B in stream P2 is 4 to 1. Calculate the total mass of stream E.
ratio P2/D2 is 1 and the ratio of A to B in stream P2 is 4 to 1. Calculate the total mass of stream E.
