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Recovering and reusing organic solvents is an important part of the operation of most chemical plants. The magnitude of these recovery efforts can be staggering: e.g., in recent years Eastman Chemical Company used 4.0 billion pounds of solvents annually and recovered 3.96 billion pounds (99%). Eastman's installation of a $26 million (in 1990 dollars) acetone-recovery system reduced acetone emissions by 50% in the division that had been responsible for most of these emissions.⁹ A gas stream containing 20.0 mole% acetone and the remainder nitrogen leaves a chemical plant at 90°C and 1 atm. In an acetone-recovery process, stream is cooled at constant pressure in a condenser, enabling some of the acetone vapor to be recovered as a liquid. The nitrogen and uncondensed acetone are discharged to the atmosphere.

Recovering and reusing organic solvents is an important part of the operation of most chemical plants. The magnitude of these recovery efforts can be staggering: e.g., in recent years Eastman Chemical Company used 4.0 billion pounds of solvents annually and recovered 3.96 billion pounds (99%). Eastman's installation of a $26 million (in 1990 dollars) acetone-recovery system reduced acetone emissions by 50% in the division that had been responsible for most of these emissions.⁹ A gas stream containing 20.0 mole% acetone and the remainder nitrogen leaves a chemical plant at 90°C and 1 atm. In an acetone-recovery process, stream is cooled at constant pressure in a condenser, enabling some of the acetone vapor to be recovered as a liquid. The nitrogen and uncondensed acetone are discharged to the atmosphere.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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. Recovering and reusing organic solvents is an important part of the operation of most chemical plants. The magnitude of these recovery efforts can be staggering: e.g., in recent years Eastman Chemical Company used 4.0 billion pounds of solvents annually and recovered 3.96 billion pounds (99%). Eastman's installation of a $26 million (in 1990 dollars) acetone-recovery system reduced acetone emissions by 50% in the division that had been responsible for most of these emissions.⁹ A gas stream containing 20.0 mole% acetone and the remainder nitrogen leaves a chemical plant at 90°C and 1 atm. In an acetone-recovery process, stream is cooled at constant pressure in a condenser, enabling some of the acetone vapor to be recovered as a liquid. The nitrogen and uncondensed acetone are discharged to the atmosphere.
Transcribed Image Text:. Recovering and reusing organic solvents is an important part of the operation of most chemical plants. The magnitude of these recovery efforts can be staggering: e.g., in recent years Eastman Chemical Company used 4.0 billion pounds of solvents annually and recovered 3.96 billion pounds (99%). Eastman's installation of a $26 million (in 1990 dollars) acetone-recovery system reduced acetone emissions by 50% in the division that had been responsible for most of these emissions.⁹ A gas stream containing 20.0 mole% acetone and the remainder nitrogen leaves a chemical plant at 90°C and 1 atm. In an acetone-recovery process, stream is cooled at constant pressure in a condenser, enabling some of the acetone vapor to be recovered as a liquid. The nitrogen and uncondensed acetone are discharged to the atmosphere.
Two cooling fluids are available-cooling-tower water at 20°C and a refrigerant at -35°C. For each fluid, calculate the percentage acetone recovery [(mol acetone condensed/mol acetone fed to condenser) x100%], assuming that the condenser temperature equals the coolant temperature.
Transcribed Image Text:Two cooling fluids are available-cooling-tower water at 20°C and a refrigerant at -35°C. For each fluid, calculate the percentage acetone recovery [(mol acetone condensed/mol acetone fed to condenser) x100%], assuming that the condenser temperature equals the coolant temperature.
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