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After fermentation, a mixture of ethanol and water is sent to a small distillation column. At the top of the distillation column, a 95% ethanol solution at 65°C is produced at a flow rate of 3.5 kg/s. Your job is to design a double-pipe heat exchanger that will cool the 95% ethanol mixture to 40°C by using cooling water that is available at 10°C. Assume an outlet temperature of the cooling water of 55°C, and only use Schedule 40 pipe from the table below. Do not do viscosity corrections for heat transfer coefficients and the 95% ethanol solution will be pumped to the inside pipe. Assume that the heat capacity for the ethanol mixture is 2.55 kJ/kg.K and the heat capacity of the coolant is 4.18 kJ/kg.K. The density of the 95% ethanol solution is 0.804 g/mL Assume that the velocity of ethanol solution as 1 m/s as the initial guess. Check the accuracy of this calculation once you select the size of the pipe (the area should agree with the area required to achieve the desired heat transfer). The viscosity of the solution is given as 9.72 × 10–4 kg/(m · s) and the thermal conductivity is 0.175 W/(m · K).

- Draw a schematic for the given system and define all the given information. List all assumptions. (5 points)
- Find heat transfer required for the hot fluid. With this heat transfer required calculate the mass flow rate of coolant needed to achieve the desired outcome. (10 points)
- Estimate the area of the pipe by assuming a velocity of 1 m/s and using the mass flowrate of ethanol solution. Find an estimated diameter. (5 points)
- Use estimated values to find a pipe that meets the criteria using the table (schedule 40 is a requirement). (5 points)
- With the chosen pipe, recalculate velocity for the inner pipe. (5 points)
- Select a Schedule 40 pipe as the outer pipe and estimate the area of the annulus section and estimate the velocity of the coolant. (10 points)
- Using the velocities find the Re number for each fluid and the corresponding convection coefficients. (10 points)
- To finalize the design, we need the length of the pipes and number of bends. Limiting the length of the pipe to 6 m, calculate the surface areas for each of the pipes. With this areas and the corresponding convection coefficients, find the overall heat transfer coefficient, U. (10 points)
- Determine the LMTD for your system. Use the relationship
q=UA∆T
_{LMTD}to find the necessary heat transfer area. Based on this, estimate the number of bends needed using the ratio of heat transfer area and surface area of the selected pipe for your design. (10 points) - What factors will be needed to provide a better design? (5 points)

Assumptions:

1. The fluid specific heats do not vary with temperature.

2. The overall heat transfer coeff is constant throughout the heat exchanger

3. Heat exchange with ambient air is negligible

4. The flow is steady

5. The fouling factors are neglected.

You can also use the estimated dia of outer pipe = 5 inches.

The convective heat transfer coefficients for both the fluids can be calculated. After calculating the h's, the values of U, heat transfer area (A) and number of bends can be calculated.

The ethanol-water mixture is separated on a distillation column. Feed contains 20% ethanol
and 1000 kmol / hour speed is entering the system. The feed temperature is 30ºC and its enthalpy is 15kcal / kg.
Saturated feed steam enthalpy 485 kcal / kg and saturated feed liquid enthalpy
70kcal / kg. Distillate has at least 80% ethanol and 2% ethanol concentration of the sub-product
is required to be. The feedback / distillate ratio is 5/3. System pressure is 1 atm....

A 60% mole Benzene and 40% mole Toluene mixture is sent to a distillation column, where it is separated into two equal streams. Calculate the composition of each stream, if the amount of benzene out of the top is 3 times greater than out the bottom.

The exit stream of a beer fermentation system (F) contains
ethanol, water and fermentation solids and has a mass flow of 1200
ton/day. This stream is fed to a separator from which has to
outlets: a stream of 300 ton/day of solids (S) and a stream (A)
that is fed to a distillation column. From the top of the column, a
flow of 750 ton/day of beer containing 12.5% ethanol and the
balance of water is released; the bottom flow...

Experiment: Purification of Organic Compounds by Simple
Distillation - using a mixture of aqueous ethanol.
Q:Would the total volume of the fractions add up to 80ml (the
initial volume) ? Explain why based on your results.

Absolute or 100% ethanol is produced from a mixture of 95%
ethanol and 5% water using the Keyes distillation process. A third
component, benzene, is added to lower the volatility of the
alcohol. Under these conditions, the overhead product is a
constat-boiling mixture of 18.5% ethanol, 7.4% water and 74.1%
benzene. Use the following data to calculate the volume of benzene
that should be fed to the still in order to produce 250 litres of
absolute ethanol: density of 100%...

1.
A mixture of ethanol (ethyl alcohol, C2H6O) and water contains
70.0% water by mass. Assuming volume additivity of the components,
estimate the specific gravity of the mixture at 20 oC. What volume
(in liters) of this mixture is required to provide 100 mol of
ethanol? Molecular weight and density of ethanol are 46.07 and
789g/L, respectively.
2. A gas stream contains 18.0 mole% hexane and the remainder
nitrogen. The stream flows to a condenser, where its temperature is
reduced...

Give reasons why or why not its possible to remove all water
from an ethanol-water mixture using distillation.

The combustion of liquid ethanol (c2H5OH) produces Carbon
Dioxide and water. After 4.62 mL of ethanol ( density= 0.789 g/mL)
was allowed to burn in the presence of 15.55 g of Oxygen gas, 3.72
mL of water (density=1.00 g/mL) was collected. Determine the
limiting reactant, theoretical yield of H20, and percent yield for
the reaction. (hint: write a balanced equation for the combustion
for the combustion of ethanol.)

The combustion of liquid ethanol (C2H5OH) produces carbon
dioxide and water. After 4.61 mL of ethanol (density=0.789g/ml) was
allowed to burn in the presence of 15.70 g of oxygen gas, 3.71 mL
of water (density=1.00g/ml) was collected. Determine the
theoretical yield of H2O for the reaction. Determine the percent
yield of H2O for the reaction.

A liquid mixture containing ethanol (55.0wt%) and the balance
water enters a separation process unit at a rate of 90.5 kg/s. A
technician draws samples of the two product streams leaving the
separator and analyzes them with a gas chromatograph, obtaining
values of 86.2wt% ethanol (product stream 1) and 10.9% ethanol
(product stream 2). The technician then reads a manometer attached
to an orifice meter mounted in the pipe carrying product stream 1,
converts the reading to a volumetric flow...

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