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It is desired to concentrate 5000 kg.hr of a solution of NaOH from 10 % to25% solids in a single effect evaporator. Steam is available at 110oC and the vapor space is maintained at 410 mmHg. The boiling point of water corresponding to the vapor space pressure is 84oC. The solution has a boiling point elevation of 10oC.The enthalpies of the feed and thick liquor are 90 and 80 kcal/kg respectively and the enthalpy of the vapour is 650 kcal /kg. the feed enters at its boiling point corresponding to the vapor space pressure. Latent heat of steam is 534 kcal/kg. a) Calculate the steam consumption per hour b) If the available heat transfer area is 35 m2, estimate the heat transfer coefficient.

It is desired to concentrate 5000 kg.hr of a solution of NaOH from 10 % to25% solids in a single effect evaporator. Steam is available at 110oC and the vapor space is maintained at 410 mmHg. The boiling point of water corresponding to the vapor space pressure is 84oC. The solution has a boiling point elevation of 10oC.The enthalpies of the feed and thick liquor are 90 and 80 kcal/kg respectively and the enthalpy of the vapour is 650 kcal /kg. the feed enters at its boiling point corresponding to the vapor space pressure. Latent heat of steam is 534 kcal/kg. a) Calculate the steam consumption per hour b) If the available heat transfer area is 35 m2, estimate the heat transfer coefficient.

Introduction to Chemical Engineering Thermodynamics
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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It is desired to concentrate 5000 kg.hr of a solution of NaOH from 10 % to25% solids in a single effect evaporator. Steam is available at 110oC and the vapor space is maintained at 410 mmHg. The boiling point of water corresponding to the vapor space pressure is 84oC. The solution has a boiling point elevation of 10oC.The enthalpies of the feed and thick liquor are 90 and 80 kcal/kg respectively and the enthalpy of the vapour is 650 kcal /kg. the feed enters at its boiling point corresponding to the vapor space pressure. Latent heat of steam is 534 kcal/kg. a) Calculate the steam consumption per hour b) If the available heat transfer area is 35 m2, estimate the heat transfer coefficient.
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