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4. A liquid mixture containing 30 mole % benzene, 25 mole % toluene and the balance xylene is fed to a distillation column. The bottoms product contains 98 mole % Xylene and no benzene and 96% of the xylene is recovered in this stream. The overhead product is fed to a second column. The overhead product from the second column contains 97% of the benzene in the feed to this column. The composition of this stream is 94% mole benzene and the balance toluene. Calculate the percentage of the benzene in the process feed (the feed to the first column) that emerges in the overhead product from the second column.

4. A liquid mixture containing 30 mole % benzene, 25 mole % toluene and the balance xylene is fed to a distillation column. The bottoms product contains 98 mole % Xylene and no benzene and 96% of the xylene is recovered in this stream. The overhead product is fed to a second column. The overhead product from the second column contains 97% of the benzene in the feed to this column. The composition of this stream is 94% mole benzene and the balance toluene. Calculate the percentage of the benzene in the process feed (the feed to the first column) that emerges in the overhead product from the second column.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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4. A liquid mixture containing 30 mole % benzene, 25 mole % toluene and the balance xylene is fed to a distillation column. The bottoms product contains 98 mole % Xylene and no benzene and 96% of the xylene is recovered in this stream. The overhead product is fed to a second column. The overhead product from the second column contains 97% of the benzene in the feed to this column. The composition of this stream is 94% mole benzene and the balance toluene. Calculate the percentage of the benzene in the process feed (the feed to the first column) that emerges in the overhead product from the second column. 5. A triple effect evaporator is fed with 1000 Ibs of a 5% salt solution to be concentrated to 40% solution. If the amount of water evaporated from the 1st effect is 375 lbs and the 2nd is 1.5 times that form the third effect. Calculate the water vapour from the 2nd and 3rd effect.\ 6. One thousand kilogram per hour of a mixture containing equal parts of methanol and water is distilled. Product streams leave the top and the bottom of the distillation column. The flow rate of the bottom is measured and found to contain 96% wt methanol. Calculate the mass fraction of methanol and mole fraction in the bottom if the bottom stream is 673 kg. 7. A wet scrubbing system has three separate inlet streams. The mass flow rates in these inlet streams are 100 Ibm/min, 58 Ibm/min and 74 lbm/min. The water spray into the scrubber is 60 Ibm/min and some of this spray evaporates and leaves the gas stream. The water stream leaving the scrubber is 49lbm/min. What is the mass flowrate of the gas stream leaving the stream?
Transcribed Image Text:4. A liquid mixture containing 30 mole % benzene, 25 mole % toluene and the balance xylene is fed to a distillation column. The bottoms product contains 98 mole % Xylene and no benzene and 96% of the xylene is recovered in this stream. The overhead product is fed to a second column. The overhead product from the second column contains 97% of the benzene in the feed to this column. The composition of this stream is 94% mole benzene and the balance toluene. Calculate the percentage of the benzene in the process feed (the feed to the first column) that emerges in the overhead product from the second column. 5. A triple effect evaporator is fed with 1000 Ibs of a 5% salt solution to be concentrated to 40% solution. If the amount of water evaporated from the 1st effect is 375 lbs and the 2nd is 1.5 times that form the third effect. Calculate the water vapour from the 2nd and 3rd effect.\ 6. One thousand kilogram per hour of a mixture containing equal parts of methanol and water is distilled. Product streams leave the top and the bottom of the distillation column. The flow rate of the bottom is measured and found to contain 96% wt methanol. Calculate the mass fraction of methanol and mole fraction in the bottom if the bottom stream is 673 kg. 7. A wet scrubbing system has three separate inlet streams. The mass flow rates in these inlet streams are 100 Ibm/min, 58 Ibm/min and 74 lbm/min. The water spray into the scrubber is 60 Ibm/min and some of this spray evaporates and leaves the gas stream. The water stream leaving the scrubber is 49lbm/min. What is the mass flowrate of the gas stream leaving the stream?
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