Dibutyl phthalate (diester) is produced in a CSTR operated isothermally at 112°C. The rate of formation of the di-ester from phthalic anhydride and butanol being very fast, the controlling step, in the presence of sulphuric acid catalyst, is the conversion of mono-ester to the diester. The liquid phase reaction is: C6H4(COOC4H6)COOH + CH₂OH → СH(COOC4H6)2 + H2O A + B The rate of the reaction is given by the expression -TA = kC gmol/L.h с + D where CA is the concentration of the mono-ester in gmol/L. The value of the apparent rate constant is given by: k = 0.7628 x 10[11.965-4516] L/gmol.h where T is the reaction temperature in K. The initial concentration of the mono-ester is 2.84 gmol/L and the density of the reaction mixture is 0.984 kg/L. (Molar mass of diester = 278) 1. In an existing plant consisting of a CSTR of 1.1 m diameter and 1.6 m height, the volumetric feed rate is 10 L/min. (a) Find the conversion achieved in an ideal CSTR. (b) If the conversion achieved in practice is 68.5% state the reasons for the discrepancy. 2. If the desired production of the diester is 10 tons per day, find whether the plant CSTR fulfils this target. If not determine if maintaining the original volumetric flow rate, but increasing the space time by taking a reactor of larger volume will improve the situation.
Dibutyl phthalate (diester) is produced in a CSTR operated isothermally at 112°C. The rate of formation of the di-ester from phthalic anhydride and butanol being very fast, the controlling step, in the presence of sulphuric acid catalyst, is the conversion of mono-ester to the diester. The liquid phase reaction is: C6H4(COOC4H6)COOH + CH₂OH → СH(COOC4H6)2 + H2O A + B The rate of the reaction is given by the expression -TA = kC gmol/L.h с + D where CA is the concentration of the mono-ester in gmol/L. The value of the apparent rate constant is given by: k = 0.7628 x 10[11.965-4516] L/gmol.h where T is the reaction temperature in K. The initial concentration of the mono-ester is 2.84 gmol/L and the density of the reaction mixture is 0.984 kg/L. (Molar mass of diester = 278) 1. In an existing plant consisting of a CSTR of 1.1 m diameter and 1.6 m height, the volumetric feed rate is 10 L/min. (a) Find the conversion achieved in an ideal CSTR. (b) If the conversion achieved in practice is 68.5% state the reasons for the discrepancy. 2. If the desired production of the diester is 10 tons per day, find whether the plant CSTR fulfils this target. If not determine if maintaining the original volumetric flow rate, but increasing the space time by taking a reactor of larger volume will improve the situation.
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:Problem 3
Dibutyl phthalate (diester) is produced in a CSTR operated isothermally at 112°C. The rate of
formation of the di-ester from phthalic anhydride and butanol being very fast, the controlling step,
in the presence of sulphuric acid catalyst, is the conversion of mono-ester to the diester. The
liquid phase reaction is:
СЫН.(СООCН:)CООН + CН,ОН
A
C6H4(COOC4H6)2 + H2O
D
B
The rate of the reaction is given by the expression
-TA = kC;
gmol/L.h
where CA is the concentration of the mono-ester in gmol/L. The value of the apparent rate
constant is given by:
k = 0.7628 x 10ol1.965- L/gmol.h
where T is the reaction temperature in K. The initial concentration of the mono-ester is 2.84
gmol/L and the density of the reaction mixture is 0.984 kg/L. (Molar mass of diester = 278)
1. In an existing plant consisting of a CSTR of 1.1 m diameter and 1.6 m height, the volumetric
feed rate is 10 L/min.
(a) Find the conversion achieved in an ideal CSTR.
(b) If the conversion achieved in practice
68.5% state the reasons for the discrepancy.
2. If the desired production of the diester is 10 tons per day, find whether the plant CSTR fulfils
this target. If not determine if maintaining the original volumetric flow rate, but increasing the
space time by taking a reactor of larger volume will improve the situation.
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