Answered: A 10% by weight NaOH solution is being…

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 10% by weight NaOH solution is being used for a caustic washing process. In order to smooth the variations in flow rate and concentration, a 10,000 gallon tank is being used as a surge tank (well mixed). The washing process requires a constant flow rate of 1500 gal/hr of the solution. Just before a plant upset, the tank contains 8000 gallons of a 10% NaOH solution, with an inlet flow to the tank of 1000 gal/hr of a 10.5% NaOH solution. Due to the upset, the inlet stream concentration drops to 5% NaOH instantaneously although the flow rate remains constant. An alarm will sound to warn the operator when the outlet concentration from the surge tank drops to 9.8% (or rises to 10.2%). The tank is well mixed and the density of all solutions is 8.3 lb/gal. All concentrations given above are on a weight basis. Find: a) how long it will take before the alarm sounds? b) if the alarm did not operate, how long it would take before the surge tank was empty?

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