Q.5A binary mixture composed of 40wt% benzene and 60wt% toluene is feed to the distillation column at a rate of 1000 Ib/hr. The top product contains 97wt% benzene and the bottom product contains 98wt% toluene. The vapour out from the top of the column at 180 °f then entering the condenser in which it is condensed at the same temperature and then cooled to 120 °f. Part of that liquid is returned to the column as reflux and the rest is withdrawn as a top product. A reflux ratio of 3.5 Ib of reflux per pound of the top product is to be used. The condenser uses water which enters at 70 °f and leaves at 100 °f calculate a) the quantity of top and bottom products produced per hour. b) The quantity of vapour evolved per hour. c) The quantity of water used in the condenser per hour. Given that:- Condenser Vapour T-180 °F Top AH, = 2 = h Of top product = 170 Btu/Ib product D Reflux 97% B CPm of top product = 0.45 Btu/lb°F R Reflux ratio=R/D-3.5 CPm of liquid water = 1 Btu/lb°F 100olb hr Feed 40% B 60% T Reboiler Bottom product w 98% T

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
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Q.5A binary mixture composed of 40wt% benzene and 60wt% toluene is feed to the distillation
column at a rate of 1000 Ib/hr. The top product contains 97wt% benzene and the bottom product
contains 98wt% toluene. The vapour out from the top of the column at 180 °f then entering the
condenser in which it is condensed at the same temperature and then cooled to 120 °f. Part of that
liquid is returned to the column as reflux and the rest is withdrawn as a top product. A reflux ratio
of 3.5 Ib of reflux per pound of the top product is to be used. The condenser uses water which
enters at 70 °f and leaves at 100 °f calculate a) the quantity of top and bottom products produced
per hour. b) The quantity of vapour evolved per hour. c) The
quantity of water used in the condenser per hour. Given that:-
Condenser
Vapour
T=180 °F
AH, = 1 = h, Of top product = 170 Btu/Ib
Top
product LD
Reflux
97% B
CPm of top product 0.45 Btu/lb°F
R
Reflux ratio=R/D=3.5
CPm of liquid water = 1 Btu/lb°F
100olb/hr Feed
40% B
60% T
Reboiler
Bottom
product w
98% T
Transcribed Image Text:Q.5A binary mixture composed of 40wt% benzene and 60wt% toluene is feed to the distillation column at a rate of 1000 Ib/hr. The top product contains 97wt% benzene and the bottom product contains 98wt% toluene. The vapour out from the top of the column at 180 °f then entering the condenser in which it is condensed at the same temperature and then cooled to 120 °f. Part of that liquid is returned to the column as reflux and the rest is withdrawn as a top product. A reflux ratio of 3.5 Ib of reflux per pound of the top product is to be used. The condenser uses water which enters at 70 °f and leaves at 100 °f calculate a) the quantity of top and bottom products produced per hour. b) The quantity of vapour evolved per hour. c) The quantity of water used in the condenser per hour. Given that:- Condenser Vapour T=180 °F AH, = 1 = h, Of top product = 170 Btu/Ib Top product LD Reflux 97% B CPm of top product 0.45 Btu/lb°F R Reflux ratio=R/D=3.5 CPm of liquid water = 1 Btu/lb°F 100olb/hr Feed 40% B 60% T Reboiler Bottom product w 98% T
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