1. Spent acid from a nitrating process contains 33.0% H,SO, and 36.0% HNO3. This acid stream is to be strengthened by mixing it with concentrated sulfuric acid containing 91.0% H,SO4 and with concentrated nitric acid containing 88.0% HNO,. The product is to contain 41.8% H;SO, and 40.0% HNO; at a flow rate of 100 lb„/h. The balance of all of the streams is water. All of the compositions are on a mass basis. a) Draw and label a flow diagram. b) How many unknowns are there (list them)? How many independent material balances can be written (describe them in words)? c) Write out all the material balance equations and solve for the flowrates of the spent and concentrated acids (in Ibm/h).
1. Spent acid from a nitrating process contains 33.0% H,SO, and 36.0% HNO3. This acid stream is to be strengthened by mixing it with concentrated sulfuric acid containing 91.0% H,SO4 and with concentrated nitric acid containing 88.0% HNO,. The product is to contain 41.8% H;SO, and 40.0% HNO; at a flow rate of 100 lb„/h. The balance of all of the streams is water. All of the compositions are on a mass basis. a) Draw and label a flow diagram. b) How many unknowns are there (list them)? How many independent material balances can be written (describe them in words)? c) Write out all the material balance equations and solve for the flowrates of the spent and concentrated acids (in Ibm/h).
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:1. Spent acid from a nitrating process contains 33.0% H,SO, and 36.0% HNO3. This acid stream
to be
strengthened by mixing it with concentrated sulfuric acid containing 91.0% H,SO4 and with concentrated
nitric acid containing 88.0% HNO,. The product is to contain 41.8% H;SO, and 40.0% HNO; at a flow rate
of 100 Ib,/h. The balance of all of the streams is water. All of the compositions are on a mass basis.
a) Draw and label a flow diagram.
b) How many unknowns are there (list them)? How many independent material balances can be written
(describe them in words)?
c) Write out all the material balance equations and solve for the flowrates of the spent and
concentrated acids (in Ibm/h).
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