A liquid mixture of acetone and water contains 35 mole% acetone. The mixture is to be partially evaporated to produce a vapor that is 75 mole% acetone, and leave a residual liquid that is 18.7 mole% acetone. a. Suppose the process is to be carried out continuously and at steady-state with a feed rate of 10.0 kmol/h. Let ny and nj be the flow rates of the vapor and liquid product streams, respectively. Draw and label a process flowchart, then write and solve balances on total moles and on acetone to determine the values of ny and nj. For each balance, state which terms in the general balance equation can be discarded, and why. b. Now suppose the process is to be carried out in a closed contained that initially contains 10.0 kmol of liquid mixture. Let ny and n¡ be the moles of final vapor and liquid phases, respectively. Draw and label a process flowchart, then write and solve integral balances on total moles and on acetone. For each balance, state which terms of the general balance equation can be discarded, and why. c. Returning to the continuous process, suppose the vaporization unit is built and started and the product stream flow rates and compositions are measured. The measured acetone content of the vapor stream is 75 mole% acetone, and the product stream is found to contain 22.3 mole% acetone. It is possible that there is an error in the measured composition of the liquid stream, but give at least five other reasons for the discrepancy.
A liquid mixture of acetone and water contains 35 mole% acetone. The mixture is to be partially evaporated to produce a vapor that is 75 mole% acetone, and leave a residual liquid that is 18.7 mole% acetone. a. Suppose the process is to be carried out continuously and at steady-state with a feed rate of 10.0 kmol/h. Let ny and nj be the flow rates of the vapor and liquid product streams, respectively. Draw and label a process flowchart, then write and solve balances on total moles and on acetone to determine the values of ny and nj. For each balance, state which terms in the general balance equation can be discarded, and why. b. Now suppose the process is to be carried out in a closed contained that initially contains 10.0 kmol of liquid mixture. Let ny and n¡ be the moles of final vapor and liquid phases, respectively. Draw and label a process flowchart, then write and solve integral balances on total moles and on acetone. For each balance, state which terms of the general balance equation can be discarded, and why. c. Returning to the continuous process, suppose the vaporization unit is built and started and the product stream flow rates and compositions are measured. The measured acetone content of the vapor stream is 75 mole% acetone, and the product stream is found to contain 22.3 mole% acetone. It is possible that there is an error in the measured composition of the liquid stream, but give at least five other reasons for the discrepancy.
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:A liquid mixture of acetone and water contains 35 mole% acetone. The
mixture is to be partially evaporated to produce a vapor that is 75 mole% acetone, and
leave a residual liquid that is 18.7 mole% acetone.
a. Suppose the process is to be carried out continuously and at steady-state with a
feed rate of 10.0 kmol/h. Let ny and ni be the flow rates of the vapor and liquid
product streams, respectively. Draw and label a process flowchart, then write
and solve balances on total moles and on acetone to determine the values of ny
and nj. For each balance, state which terms in the general balance equation can
be discarded, and why.
b. Now suppose the process is to be carried out in a closed contained that initially
contains 10.0 kmol of liquid mixture. Let ny and nj be the moles of final vapor and
liquid phases, respectively. Draw and label a process flowchart, then write and
solve integral balances on total moles and on acetone. For each balance, state
which terms of the general balance equation can be discarded, and why.
c. Returning to the continuous process, suppose the vaporization unit is built and
started and the product stream flow rates and compositions are measured. The
measured acetone content of the vapor stream is 75 mole% acetone, and the
product stream is found to contain 22.3 mole% acetone. It is possible that there
is an error in the measured composition of the liquid stream, but give at least
five other reasons for the discrepancy.
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