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vapor-liquid equilibrium

vapor-liquid equilibrium

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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Solve d) e e)

1) Water / n-Butanol Separation. A saturated liquid feed of 1000 mol/hr containing 38 mole % water is to be fractionated at 101.325kPa (abs) in order to form a distillate containing 80 mole % water and a bottoms product of 8 mole % water. Assuming Raoult's Law behavior applies - Antoine's constants and the associated vapor-liquid equilibrium has been modeled (provided). The column is designed with a reflux ratio of 4:1. a) Calculate the flowrates (mol/hr) of the distillate and bottoms. b) Determine the minimum reflux ratio, RMIN and the minimum number of theoretical trays at total reflux. c) Determine the theoretical number of trays and the feed tray number for the specified operation al design. d) If each stage in the column is 75% efficient how many stages will be required? (Hint: recalculate an effective (actual) equilibrium line based on Yactual = 0.75 Yequilibrium) e) If the column (overall) is assumed to be 75% efficient how many stages will be required?
Transcribed Image Text:1) Water / n-Butanol Separation. A saturated liquid feed of 1000 mol/hr containing 38 mole % water is to be fractionated at 101.325kPa (abs) in order to form a distillate containing 80 mole % water and a bottoms product of 8 mole % water. Assuming Raoult's Law behavior applies - Antoine's constants and the associated vapor-liquid equilibrium has been modeled (provided). The column is designed with a reflux ratio of 4:1. a) Calculate the flowrates (mol/hr) of the distillate and bottoms. b) Determine the minimum reflux ratio, RMIN and the minimum number of theoretical trays at total reflux. c) Determine the theoretical number of trays and the feed tray number for the specified operation al design. d) If each stage in the column is 75% efficient how many stages will be required? (Hint: recalculate an effective (actual) equilibrium line based on Yactual = 0.75 Yequilibrium) e) If the column (overall) is assumed to be 75% efficient how many stages will be required?
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