Country : Australia
Assignment Task:

Mass and Energy Balances 

Reaction Mechanism 

20200603141016PM-738268719-1572183138.png

1% conversion Assume all of the separation steps (distillation towers) give perfect splits for the components shown.

b. How does the propane flowrate change at the reactor inlet when the purge rate goes from 0.1% to 1%? 2. Assume the feed into a flash tank consists of 25 moles pentane, 40 moles cis-2 butene and 35 moles n-butane.

a. Find the recovery of n-butane when the pressure is 200 kPa and temperature is 300K.

b. Calculate dew and bubble point temperatures at 200 kPa. What are the bubble and dew compositions?

c. If the flash tank operates at 100 kPa, at what temperature could you recover 60% cis-2-butene in the vapor?

3. It is desired to separate propylene from trans-2-butene in a distillation column. The feed stream is available as saturated liquid at 15 bar, and has the following compo sition propylene 45 gmol/s trans-2-butene 10 cis-2-butene 15 " 1-butene 6 " ethylene 5 " propane 

4 " It is desired to recover 99.5% of the propylene in the distillate and 99% of trans-2 butene in the bottom stream.

a. Determine the temperature of the feed stream and the minimum number of plates that are required for the column.

b. Determine the mole fraction composition of the distillate and the bottoms.

c. If cooling water at 90°F is to be used in the condenser with AT min = 10°C, what would be the lowest pressures at which the column should operate if the distillate is obtained as either saturated liquid or saturated vapor? Also, for these two cases, what would be the maximum temperatures in a total reboiler? 

4. It is proposed to use an absorption column to recover 99.2% of acetone from a gas stream at 2 bar, 300°K, that has the following composition: 94.3 gmol/s air, 5.0 gmol/s acetone, 0.7 gmolls formaldehyde. a. If water is to be used as the solvent, estimate its required flowrate for the following conditions: P column T water 2 bar 

300°K 2 bar 

330°K 10 bar 

300°K 10 bar 

330°K b. Estimate the number of theoretical trays required for this column. C. Assuming the absorber will operate at 2 bar, and with the temperature of the 

water at 300°K, calculate the mass balance for the column, and estimate the temperature of the outlet liquid stream.

5. Given a saturated liquid stream of 30 gmol/sec propane and 70 gmol/sec 1-butene at 10 bar,

a. Find the vapor fraction of this stream if it is throttled down to 2 bar. 

b. Find the heat load to vaporize 60% of the stream at 10 bar.

6. Consider a distillation column with a feed of 10 gmol/s benzene, 20 gmol/s 0-xylene and 15 gmol/s toluene at 1 atm and 230°F. a. For a benzene recovery of 98%, what is the minimum number of trays if the ratio of benzene to 0-xylene in the overhead is 100? Find the bottoms and tops compositions. b. Periodically a small amount of H2S appears in the feed. Since it is undesirable to have this component in the product, explain qualitatively how you would de sign and operate this column to separate the H,S. C. An overhead product of 55% benzene, 40% toluene, and 5% o-xylene is recov ered as saturated liquid. Can cooling water be used if the column operates at 2 bar?

7. Separate the following feed stream: 50 gmol/s hexane T= 350 K 30 gmol/s pentane p = 150 kPa 20 gmol/s octane so that pentane and octane have overhead recoveries of 0.99 and 0.02, respectively. The overhead pressure is 100 kPa.

a. Find the top and bottoms compositions.

b. Estimate the condenser temperature if the distillate is all vapor. 

c. If the reflux ratio is 0.2, find the reboiler duty if the feed is 20% vaporized.

8. Consider the ammonia process given below. A feed of 20% N,, 78% H, and 2% CH4 is mixed with two recycle streams and enters a reactor. Here, conversion per pass of N2 to NH, is 45% according to the reaction: 

N2 + 3H2 + 2NH3 

 

This Engineering Assignment has been solved by our Engineering Experts at UniLearnO. Our Assignment Writing Experts are efficient to provide a fresh solution to this question. We are serving more than 10000+ Students in Australia, UK & US by helping them to score HD in their academics. Our Experts are well trained to follow all marking rubrics & referencing style.

Be it a used or new solution, the quality of the work submitted by our assignment experts remains unhampered. You may continue to expect the same or even better quality with the used and new assignment solution files respectively. There’s one thing to be noticed that you could choose one between the two and acquire an HD either way. You could choose a new assignment solution file to get yourself an exclusive, plagiarism (with free Turnitin file), expert quality assignment or order an old solution file that was considered worthy of the highest distinction.

  • Uploaded By : Mia
  • Posted on : June 03rd, 2019
  • Downloads : 195

Whatsapp Tap to ChatGet instant assistance