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A distillation column is to be used for separating n-butane and n-pentane where the feed (F) mole fractions are 0.15 and 0.85, respectively. The molar flow rate of the feed stream is 100 lb mol/hr and it is at P = 10 atm. The reflux ratio is 5. a) It is desired to recover 88 % of the butane in the top product, and the bottom product should contain 5 mol % of butane. Perform mole balances to determine the molar flow rates of: i. The total top (D) and bottom (B) streams ii. Butane in the top and bottom streams

A distillation column is to be used for separating n-butane and n-pentane where the feed (F) mole fractions are 0.15 and 0.85, respectively. The molar flow rate of the feed stream is 100 lb mol/hr and it is at P = 10 atm. The reflux ratio is 5. a) It is desired to recover 88 % of the butane in the top product, and the bottom product should contain 5 mol % of butane. Perform mole balances to determine the molar flow rates of: i. The total top (D) and bottom (B) streams ii. Butane in the top and bottom streams

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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A distillation column is to be used for separating n-butane and n-pentane where the feed (F) mole fractions are 0.15 and 0.85, respectively. The molar flow rate of the feed stream is 100 lb mol/hr and it is at P = 10 atm. The reflux ratio is 5. a) It is desired to recover 88 % of the butane in the top product, and the bottom product should contain 5 mol % of butane. Perform mole balances to determine the molar flow rates of: i. The total top (D) and bottom (B) streams ii. Butane in the top and bottom streams b) If the feed is superheated by 40 °F, and the reflux is subcooled by 50 °F, calculate the condenser and reboiler heat duties. Make the following assumptions: - All streams have the same thermal properties as n- pentane - The mean column temperature is 270 °F And determine the following: i. Given T = 242.9 °F, what is T ? bp ii. Write an energy balance around the condenser to find the condenser duty in Btu/hr. (H 26,599 Btu/lbmol, Hp@1929 F = 15,157 Btu/lbmol) y@270 °F D@ iii. Given T = 257.7 °F, what is T? dp feed condenser iv. Write an energy balance around the entire column to find the reboiler duty in Btu/hr (H = 19,024 Btu/lbmol, H B@column temp F@superheated vap T = = 27,469 Btu/lbmol) (Hints: the distillate is a subcooled liquid, the bottoms product is a liquid at the column temperature and the feed is a vapor at the superheated temperature)
Transcribed Image Text:A distillation column is to be used for separating n-butane and n-pentane where the feed (F) mole fractions are 0.15 and 0.85, respectively. The molar flow rate of the feed stream is 100 lb mol/hr and it is at P = 10 atm. The reflux ratio is 5. a) It is desired to recover 88 % of the butane in the top product, and the bottom product should contain 5 mol % of butane. Perform mole balances to determine the molar flow rates of: i. The total top (D) and bottom (B) streams ii. Butane in the top and bottom streams b) If the feed is superheated by 40 °F, and the reflux is subcooled by 50 °F, calculate the condenser and reboiler heat duties. Make the following assumptions: - All streams have the same thermal properties as n- pentane - The mean column temperature is 270 °F And determine the following: i. Given T = 242.9 °F, what is T ? bp ii. Write an energy balance around the condenser to find the condenser duty in Btu/hr. (H 26,599 Btu/lbmol, Hp@1929 F = 15,157 Btu/lbmol) y@270 °F D@ iii. Given T = 257.7 °F, what is T? dp feed condenser iv. Write an energy balance around the entire column to find the reboiler duty in Btu/hr (H = 19,024 Btu/lbmol, H B@column temp F@superheated vap T = = 27,469 Btu/lbmol) (Hints: the distillate is a subcooled liquid, the bottoms product is a liquid at the column temperature and the feed is a vapor at the superheated temperature)
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