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A process mixed two compounds and heated them in a closed stirred tank to make a solution. The solvent was known to be stable up to 500 °C, and the other compound was an organic cyclic ether, which was stable at the mixing temperature, which was 95°C. Following mixing, the solution was pumped downstream through a heat exchanger which cooled the solution to room temperature. Now this part of the plant was modified, such that the mixing temperature was raised to 130°C for the calculated advantage of more uniform mixing. The review team justified the change as minor, since the heat exchanger was placed further away from mixer, such that the feed temperature at the inlet of the heat exchanger, was same as before. However, when the plant was started up and after a few hours only, the mixer vessel ruptured causing injuries to personnel! Only after this accident, an Accelerated Rate Calorimetry (ARC) test was run on the solution (product of the mixing vessel) and the results are given in the figure below:

A process mixed two compounds and heated them in a closed stirred tank to make a solution. The solvent was known to be stable up to 500 °C, and the other compound was an organic cyclic ether, which was stable at the mixing temperature, which was 95°C. Following mixing, the solution was pumped downstream through a heat exchanger which cooled the solution to room temperature. Now this part of the plant was modified, such that the mixing temperature was raised to 130°C for the calculated advantage of more uniform mixing. The review team justified the change as minor, since the heat exchanger was placed further away from mixer, such that the feed temperature at the inlet of the heat exchanger, was same as before. However, when the plant was started up and after a few hours only, the mixer vessel ruptured causing injuries to personnel! Only after this accident, an Accelerated Rate Calorimetry (ARC) test was run on the solution (product of the mixing vessel) and the results are given in the figure below:

Introduction to Chemical Engineering Thermodynamics
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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A process mixed two compounds and heated them in a closed stirred tank to make a solution. The solvent was known to be stable up to 500 °C, and the other compound was an organic cyclic ether, which was stable at the mixing temperature, which was 95°C. Following mixing, the solution was pumped downstream through a heat exchanger which cooled the solution to room temperature. Now this part of the plant was modified, such that the mixing temperature was raised to 130°C for the calculated advantage of more uniform mixing. The review team justified the change as minor, since the heat exchanger was placed further away from mixer, such that the feed temperature at the inlet of the heat exchanger, was same as before. However, when the plant was started up and after a few hours only, the mixer vessel ruptured causing injuries to personnel! Only after this accident, an Accelerated Rate Calorimetry (ARC) test was run on the solution (product of the mixing vessel) and the results are given in the figure below:
Transcribed Image Text:A process mixed two compounds and heated them in a closed stirred tank to make a solution. The solvent was known to be stable up to 500 °C, and the other compound was an organic cyclic ether, which was stable at the mixing temperature, which was 95°C. Following mixing, the solution was pumped downstream through a heat exchanger which cooled the solution to room temperature. Now this part of the plant was modified, such that the mixing temperature was raised to 130°C for the calculated advantage of more uniform mixing. The review team justified the change as minor, since the heat exchanger was placed further away from mixer, such that the feed temperature at the inlet of the heat exchanger, was same as before. However, when the plant was started up and after a few hours only, the mixer vessel ruptured causing injuries to personnel! Only after this accident, an Accelerated Rate Calorimetry (ARC) test was run on the solution (product of the mixing vessel) and the results are given in the figure below:
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