6.63. The feed to a distillation column (sketched below) is a 45.0 mole% n-pentane-55.0 mole% n-hexane liquid mixture. The vapor stream leaving the top of the column, which contains 98.0 mole% pentane and the balance hexane, goes to a total condenser (which means all the vapor is condensed). Half of the liquid condensate is returned to the top of the column as reflux and the rest is withdrawn as overhead product (distillate) at a rate of 85.0kmol/h. The distillate contains 95.0% of the pentane fed to the column. The liquid stream leaving the bottom of the column goes to a reboiler. Part of the stream is vaporized; the vapor is returned to the bottom of the column as boilup, and the residual liquid is withdrawn as bottoms product. (a) Calculate the molar flow rate of the feed stream and the molar flow rate and composition of the bottoms product stream. (b) Estimate the temperature of the vapor entering the condenser, assuming that it is saturated (at its dew point) at an absolute pressure of 1 atm and that Raoult's law applies to both pentane and hexane. Then estimate the volumetric flow rates of the vapor stream leaving the column and of the liquid distillate product. State any assumptions you make. (c) Estimate the temperature of the reboiler and the composition of the vapor boilup, again assuming operation at 1 atm. Vapor from top of column CONDENSER Cooling fluid Reflux Distillate (liquid) (liquid) Feed to DISTILLATION column COLUMN Boilup (vapor) Liquid from bottom of column REBOILER Heating fluid Bottoma product (liquid) (d) Calculate the minimum diameter of the pipe connecting the column and the condenser if the maximum allowable vapor velocity in the pipe is 10 m/s. Then list all the assumptions underlying the calculation of that number.
6.63. The feed to a distillation column (sketched below) is a 45.0 mole% n-pentane-55.0 mole% n-hexane liquid mixture. The vapor stream leaving the top of the column, which contains 98.0 mole% pentane and the balance hexane, goes to a total condenser (which means all the vapor is condensed). Half of the liquid condensate is returned to the top of the column as reflux and the rest is withdrawn as overhead product (distillate) at a rate of 85.0kmol/h. The distillate contains 95.0% of the pentane fed to the column. The liquid stream leaving the bottom of the column goes to a reboiler. Part of the stream is vaporized; the vapor is returned to the bottom of the column as boilup, and the residual liquid is withdrawn as bottoms product. (a) Calculate the molar flow rate of the feed stream and the molar flow rate and composition of the bottoms product stream. (b) Estimate the temperature of the vapor entering the condenser, assuming that it is saturated (at its dew point) at an absolute pressure of 1 atm and that Raoult's law applies to both pentane and hexane. Then estimate the volumetric flow rates of the vapor stream leaving the column and of the liquid distillate product. State any assumptions you make. (c) Estimate the temperature of the reboiler and the composition of the vapor boilup, again assuming operation at 1 atm. Vapor from top of column CONDENSER Cooling fluid Reflux Distillate (liquid) (liquid) Feed to DISTILLATION column COLUMN Boilup (vapor) Liquid from bottom of column REBOILER Heating fluid Bottoma product (liquid) (d) Calculate the minimum diameter of the pipe connecting the column and the condenser if the maximum allowable vapor velocity in the pipe is 10 m/s. Then list all the assumptions underlying the calculation of that number.
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
Related questions
Question
Transcribed Image Text:6.63. The feed to a distillation column (sketched below) is a 45.0 mole% n-pentane-55.0 mole%
n-hexane liquid mixture. The vapor stream leaving the top of the column, which contains 98.0 mole%
pentane and the balance hexane, goes to a total condenser (which means all the vapor is condensed).
Half of the liquid condensate is returned to the top of the column as reflux and the rest is withdrawn as
overhead product (distillate) at a rate of 85.0kmol/h. The distillate contains 95.0% of the pentane fed
to the column. The liquid stream leaving the bottom of the column goes to a reboiler. Part of the
stream is vaporized; the vapor is returned to the bottom of the column as boilup, and the residual
liquid is withdrawn as bottoms product.
(a) Calculate the molar flow rate of the feed stream and the molar flow rate and composition of the
bottoms product stream.
(b) Estimate the temperature of the vapor entering the condenser, assuming that it is saturated (at its
dew point) at an absolute pressure of 1 atm and that Raoult's law applies to both pentane and
hexane. Then estimate the volumetric flow rates of the vapor stream leaving the column and of the
liquid distillate product. State any assumptions you make.
(c) Estimate the temperature of the reboiler and the composition of the vapor boilup, again assuming
operation at 1 atm.
Vapor from
top of column
CONDENSER
Cooling fluid
Reflux
Distillate
(liquid)
(liquid)
Feed to
DISTILLATION
column
COLUMN
Boilup
(vapor)
Liquid from
bottom of column
REBOILER
Heating
fluid
Bottoma
product (liquid)
(d) Calculate the minimum diameter of the pipe connecting the column and the condenser if the
maximum allowable vapor velocity in the pipe is 10 m/s. Then list all the assumptions underlying
the calculation of that number.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 1 images
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The