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

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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Question

. 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.

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