calculate the stream flows

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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Monochlorobenzene is produced by the reaction of benzene with chlorine. A mixture of monochlorobenzene and dichlorobenzene is produced, with a small amount of trichlorobenzene. Hydrogen chloride is produced as a byproduct. Benzene is fed to the reactor in excess to promote the production of monochlorobenzene. The reactor products are fed to a condenser where the chlorobenzenes and unreacted benzene are condensed. The condensate is separated from the noncondensable gases in a separator. The noncondensables, hydrogen chloride and unreacted chlorine, pass to an absorption column where the hydrogen chloride is absorbed in water. The chlorine leaving the absorber is recycled to the reactor. The liquid phase from the separator, containing chlorobenzenes and unreacted benzene, is fed to a distillation column, where the chlorobenzenes are separated from the unreacted benzene. The benzene is recycled to the reactor. Using the following data, calculate the stream flows and draw up a preliminary flowsheet for the production of 1.0 metric ton (tonne) of monochlorobenzene per day.

Reactions:
Mol ratio Cl,:C H, at inlet to reactor = 0.9
%3D
Overall conversion of benzene = 55.3%
%3D
C,H, + Cl2 → C,H5 + HCl
C, H, + 2C12 –→ C,H4 Cl2 + 2HCI
Yield of monochlorobenzene = 73.6%
Yield of dichlorobenzene = 27.3%
%3D
Production of other chlorinated compounds can be neglected.
Separator
Assume 0.5% of the liquid stream is entrained with the vapor.
Absorber
Assume 99.99%absorption of hydrogen chloride and that 98% of the chlorine
is recycled, the remainder being dissolved in the water. The water supply to
the absorber is set to produce a 30% w/w strength hydrochloric acid.
Distillation column
Take the recovery of benzene to be 95%, and 99.99% recovery of the
chlorobenzenes.
Note: This problem can be solved without using process simulation software Start the mass
balance at the reactor inlet (after the recycle streams have been added) and assume 100
kgmol/h of benzene at this point.
Transcribed Image Text:Reactions: Mol ratio Cl,:C H, at inlet to reactor = 0.9 %3D Overall conversion of benzene = 55.3% %3D C,H, + Cl2 → C,H5 + HCl C, H, + 2C12 –→ C,H4 Cl2 + 2HCI Yield of monochlorobenzene = 73.6% Yield of dichlorobenzene = 27.3% %3D Production of other chlorinated compounds can be neglected. Separator Assume 0.5% of the liquid stream is entrained with the vapor. Absorber Assume 99.99%absorption of hydrogen chloride and that 98% of the chlorine is recycled, the remainder being dissolved in the water. The water supply to the absorber is set to produce a 30% w/w strength hydrochloric acid. Distillation column Take the recovery of benzene to be 95%, and 99.99% recovery of the chlorobenzenes. Note: This problem can be solved without using process simulation software Start the mass balance at the reactor inlet (after the recycle streams have been added) and assume 100 kgmol/h of benzene at this point.
Expert Solution
Step 1

Chemical Process consists of various unit operations with equipment. We can consider heat transfer, Mass transfer, Chemical reaction and like wise. The equipment running on these are heat exchanger, distillation column, reactor and like wise respectively. The overall material balances and energy balances makes the chemical  process work and valid.

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