Answered: NaCI crystals are to be produced from…

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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NaCI crystals are to be produced from 1000 kg of a solution containing 10% NaCI. 1 % KOH and 89% water. The solution is first sent to an evaporator where 790 kg of water from the solution is removed. The hot concentrated solution is then sent to a crystallizer where the solution is cooled to 200C and NaCI crystals are precipitated. (No water evaporates). Each kg of crystals carries with it 0.1 kg of adhering mother liquor. The wet crystals are then treated in a drier where 95% of the water is removed. Make a complete material balance for the system. Data: solubility at 20°C is 36 g NaCI/100 g water. Assume that KOH is non-volatile and very soluble in water; its presence does not affect the solubility of NaCI in water.

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