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Question 40615

posted 1 years ago

Answer the following question, using the equilibrium diagram of water-ethylene glycol-furfural system given in following link
Determine the percentage of water when furfural composition is 60 wt.%.

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Question 40609

posted 1 years ago

A saturated liquid feed of 500 kmol/h consists of 10 mol% propane, 35 mol% n-butane and 55 mol% n-hexane.
A distillate recovery of 99.5 mol% n-butane and bottoms recovery of 97.5 mol% n-hexane is desired.
\text { The average relative volatility is } \alpha_{\text {propane-butane }}=2.04 ; \alpha_{\text {butane }-\text { butanc }}=1.00 ; \text { and } \alpha_{\text {hexane }-\text { butane }}=0.2
constant molar overflow (CMO) is valid. Reflux is returned as a saturated liquid. Thelumn has a partial reboiler and a total condenser.
Using the Fenske equation, determine the number of staĝes required at total reflux (Nmin)-

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Question 40610

posted 1 years ago

A saturated vapour feed of 2250 kmol/h consists of 50 mol% methane, 30 mol%propane and 20 mol% n-butane.
A distillate recovery of 99 mol% propane and bottoms recovery of 97.5 mol% n-butane is desired.
\text { The average relative volatility is } \alpha_{\text {methane-propane }}=9.92 x_{\text {propane-propane }}=\text { and }
\alpha_{\text {butane-propane }}=0.49
Constant molar overflow (CMO) is valid. Reflux is returned as a saturated liquid. Thecolumn has a partial reboiler and a total condenser.
\text { Calculate the value of } \phi
You must state the answer in 4 decimal places.

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Question 40612

posted 1 years ago

A saturated liquid feed of 1000 kmol/h consists of 25 mol% propane, 35 mol% n-butaneand 40 mol% n-hexane.
A distillate recovery of 99 mol% n-butane and bottoms recovery of 98 mol% n-hexane isdesired.
\text { The average relative volatility is } \alpha_{\text {propane }-\text { butane }}=2.04 \alpha_{\text {butane }-\text { butane }}=1.00 \mathrm{and}
\alpha_{\text {hexane-butane }}=0.2
Constant molar overflow (CMO) is valid. Reflux is returned as a saturated liquid. Thecolumn has a partial reboiler and a total condenser.
\text { Using Gilliland correlation, calculate the total number of stages if } R=1.025 \times R_{\min -}

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Question 40611

posted 1 years ago

A saturated liquid feed of 750 kmol/h consists of 20 mol% propane, 35 mol% n-butane and 45 mol% n-hexane.
A distillate recovery of 98 mol% n-butane and bottoms recovery of 99 mol% n-hexane is desired.
\text { The average relative volatility is } \alpha_{\text {propane-butane }}=2.04 \alpha_{\text {butane-butane }}=1.00 \mathrm{and}
\alpha_{\text {hexane-butane }}=0.2
Constant molar overflow (CMO) is valid. Reflux is returned as a saturated liquid. The column has a partial reboiler and a total condenser.
Calculate the total vapour flow rate in the enriching section at minimum reflux (Vmin) in kmol/h
D = 410.625 kmol/h
\phi=0.3197 \text { [Trial and Error] }

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Question 40613

posted 1 years ago

It is desired to strip acetone from an acetone-water mixture into an air stream
The system operates isothermally at 20 °C and a total pressure of 300 mm Hg.
The inlet air is pure.
The column operates at L/V = 2.5
The entering liquid concentration is 1 mol% acetone and the measured outlet liquid concentration is 0.03 mol% acetone.
Assume that equilibrium is of the form y = mx
Assume dilute system.
Determine the concentration of acetone in air (in mol%) leaving the stripping column.

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Question 40606

posted 1 years ago

An equimolar mixture of the four components (ethane, n-Butane,n-Octane, n-Decane) is flashed at 1000 kPa and 100°C.
Calculate the ratio of molar flow rates of vapour product to feed i.e. (V/F).

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Question 40607

posted 1 years ago

A binary feed mixture consisting of 30 mol% methanol and rest water needs to be separated by flashing at 90 °C and 1 atm.
The vapour-liquid equilibrium (VLE) data for the methanol-water system at 1 atm are given in Table 1 [adapted from Perry et al. (1963)].
Using the linear interpolation method and using the information given in Table 1,determine the percentage recovery of methanol in the vapour stream.

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Question 40608

posted 1 years ago

A feed mixture consisting of 35 mol% ethanol, 27 mol% n-propanol, 25 mol% methanol and 13 mol% n-butanol is fed to a distillation column.
The molar flow rate of the feed is 2500 kmol/h.
Methanol is the most volatile component followed by ethanol and n-propanol, while n-butanol is the least volatile component.
99.7 mol% recovery of methanol in the distillate and a methanol mole fraction of 0.99are desired.
Determine the molar flow rate of ethanol in Distillate in kmol/h

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Question 40614

posted 1 years ago

It is desired to separate methanol (CH3OH) from methanol-water mixture in a sieve plate column operating at 2 atm, 83.2 °C (methanol boiling point at 2 atm), and 80% of the flooding velocity.
The spacing of the trays is 600 mm and the vapour and liquid flow rates are 650 kmol/hrand 2750 kmol/hr, respectively.
Assume ideal gas law, the density of water as 1000 kg/m and that the vapour is entirely methanol and liquid is entirely water.
Calculate the liquid-vapour flow factor

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