Terephthalic acid (TPA), a raw material in the manufacture of polyester fiber, film, and soft drink bottles, is synthesized from -xylene (PX) in the process shown below. C8H10 + 302 → C8H6O4 + 2H2O Off-gases: 4 mole% 0, 96% N2 PX = p-xylene S- solution TPA = terephthalic acid 02, N2, H,0(v) 105 č, 5.5 atm H,0(1) CONDENSER Air @ 25°C, 6.0 atm REACTOR PX() Reactor feed 3 kg S/kg PX PX, TPA, S TPA(s) SEPARATOR Recycle (D: PX, S A fresh feed of pure liquid PX combines with a recycle stream containing PX and a solution (S) of a catalyst (a cobalt salt) in a solvent (methanol). The combined stream, which contains S and PX in a 3:1 mass ratio, is fed to a reactor in which 90% of the PX is converted to TPA. A stream of air at 25°C and 6.0 atm absolute is also fed to the reactor. The air bubbles through the liquid and the reaction given above takes place under the influence of the catalyst. A liquid stream containing unreacted PX, dissolved TPA, and all the S that entered the reactor goes to a separator in which solid TPA crystals are formed and filtered out of the solution. The filtrate, which contains all the S and PX leaving the reactor, is the recycle stream. A gas stream containing unreacted oxygen, nitrogen, and the water formed in the reaction leaves the reactor at 105°C and 5.5 atm absolute and goes through a condenser in which essentially all the water is condensed. The uncondensed gas contains 4.0 mole% 02. Taking 100 kmol TPA produced/h as a basis of calculation, a. Draw and label a flowchart for the process. b. What is the required fresh feed rate (kmol PX/h)? c. What are the volumetric flow rates (m /h) of the air fed to the reactor, the gas leaving the reactor, and the liquid water leaving the condenser? Assume ideal gas behavior for the two gas streams. d. What is the mass flow rate (kg/h) of the recycle stream?
Terephthalic acid (TPA), a raw material in the manufacture of polyester fiber, film, and soft drink bottles, is synthesized from -xylene (PX) in the process shown below. C8H10 + 302 → C8H6O4 + 2H2O Off-gases: 4 mole% 0, 96% N2 PX = p-xylene S- solution TPA = terephthalic acid 02, N2, H,0(v) 105 č, 5.5 atm H,0(1) CONDENSER Air @ 25°C, 6.0 atm REACTOR PX() Reactor feed 3 kg S/kg PX PX, TPA, S TPA(s) SEPARATOR Recycle (D: PX, S A fresh feed of pure liquid PX combines with a recycle stream containing PX and a solution (S) of a catalyst (a cobalt salt) in a solvent (methanol). The combined stream, which contains S and PX in a 3:1 mass ratio, is fed to a reactor in which 90% of the PX is converted to TPA. A stream of air at 25°C and 6.0 atm absolute is also fed to the reactor. The air bubbles through the liquid and the reaction given above takes place under the influence of the catalyst. A liquid stream containing unreacted PX, dissolved TPA, and all the S that entered the reactor goes to a separator in which solid TPA crystals are formed and filtered out of the solution. The filtrate, which contains all the S and PX leaving the reactor, is the recycle stream. A gas stream containing unreacted oxygen, nitrogen, and the water formed in the reaction leaves the reactor at 105°C and 5.5 atm absolute and goes through a condenser in which essentially all the water is condensed. The uncondensed gas contains 4.0 mole% 02. Taking 100 kmol TPA produced/h as a basis of calculation, a. Draw and label a flowchart for the process. b. What is the required fresh feed rate (kmol PX/h)? c. What are the volumetric flow rates (m /h) of the air fed to the reactor, the gas leaving the reactor, and the liquid water leaving the condenser? Assume ideal gas behavior for the two gas streams. d. What is the mass flow rate (kg/h) of the recycle stream?
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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Transcribed Image Text:Terephthalic acid (TPA), a raw material in the manufacture of polyester fiber, film, and soft
drink bottles, is synthesized from -xylene (PX) in the process shown below.
C8H10 + 302 → C8H604 + 2H2O
Off-gases:
4 mole% 02, 96% N2
PX = p-xylene
S= solution
TPA = terephthalic acid
02, Ng, H20(v)
105°Č, 5.5 atm
H,0(1)
CONDENSER
Air @ 25°C, 6.0 atm
REACTOR
PX() Reactor feed
3 kg S/kg PX
РX, ТРА, S
TPA(s)
SEPARATOR
Recycle (1): PX, S
A fresh feed of pure liquid PX combines with a recycle stream containing PX and a solution
(S) of a catalyst (a cobalt salt) in a solvent (methanol). The combined stream, which contains
S and PX in a 3:1 mass ratio, is fed to a reactor in which 90% of the PX is converted to TPA.
A stream of air at 25°C and 6.0 atm absolute is also fed to the reactor. The air bubbles through
the liquid and the reaction given above takes place under the influence of the catalyst. A liquid
stream containing unreacted PX, dissolved TPA, and all the S that entered the reactor goes to
a separator in which solid TPA crystals are formed and filtered out of the solution. The filtrate,
which contains all the S and PX leaving the reactor, is the recycle stream. A gas stream
containing unreacted oxygen, nitrogen, and the water formed in the reaction leaves the reactor
at 105°C and 5.5 atm absolute and goes through a condenser in which essentially all the water
is condensed. The uncondensed gas contains 4.0 mole% 02. Taking 100 kmol TPA produced/h
as a basis of calculation,
a. Draw and label a flowchart for the process.
b. What is the required fresh feed rate (kmol PX/h)?
c. What are the volumetric flow rates (m /h) of the air fed to the reactor, the gas leaving
the reactor, and the liquid water leaving the condenser? Assume ideal gas behavior for
the two gas streams.
d. What is the mass flow rate (kg/h) of the recycle stream?
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