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Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a 25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of 1.25 kW/m'K. The evaporator operates at atmospheric pressure and the feed enters at 300 K. Saturated steam at 400 K is used for heating. a) Draw a block diagram of the process and define the streams and units in the block diagram. Calculate: b) the boiling point elevation as K. c) the amount of concentrate and vapor produced as kg/s. d) the heat transfer area of the evaporator. e) the amount of steam used for heating as kg/s.

Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a 25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of 1.25 kW/m'K. The evaporator operates at atmospheric pressure and the feed enters at 300 K. Saturated steam at 400 K is used for heating. a) Draw a block diagram of the process and define the streams and units in the block diagram. Calculate: b) the boiling point elevation as K. c) the amount of concentrate and vapor produced as kg/s. d) the heat transfer area of the evaporator. e) the amount of steam used for heating as kg/s.

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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Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a 25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of 1.25 kW/m'K. The evaporator operates at atmospheric pressure and the feed enters at 300 K. Saturated steam at 400 K is used for heating. a) Draw a block diagram of the process and define the streams and units in the block diagram. Calculate: b) the boiling point elevation as K. c) the amount of concentrate and vapor produced as kg/s. d) the heat transfer area of the evaporator. e) the amount of steam used for heating as kg/s. Calcium Chloride Water Solution - Specific Heat 4500 Specific Heat 4000 3500 3000 LThe Engineering ToolBox www.EngineeringTeOBO.com 2500 10 20 30 40 Concentra tion by mass (%) Figure Q2-a. Specific heat of aqueous CaCl2 solution Specific Heat (Jkg K)
Transcribed Image Text:Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a 25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of 1.25 kW/m'K. The evaporator operates at atmospheric pressure and the feed enters at 300 K. Saturated steam at 400 K is used for heating. a) Draw a block diagram of the process and define the streams and units in the block diagram. Calculate: b) the boiling point elevation as K. c) the amount of concentrate and vapor produced as kg/s. d) the heat transfer area of the evaporator. e) the amount of steam used for heating as kg/s. Calcium Chloride Water Solution - Specific Heat 4500 Specific Heat 4000 3500 3000 LThe Engineering ToolBox www.EngineeringTeOBO.com 2500 10 20 30 40 Concentra tion by mass (%) Figure Q2-a. Specific heat of aqueous CaCl2 solution Specific Heat (Jkg K)
12 120 - 340 Sucrose o Citrie 10 110 + 320 acid 40 Weight % solids 35 OKraft liquid °Glycerol 8 100 -300 ONANO, OINH,sO, oK,CO, CalNO,),° oKCI 90 280 for Nomograph boiling-point elevation OHNO, OLINO, 15 80 + 260 of 50 70 240 aqueous solutions 55 ° CaCl2 O NaCi 50 45 50 200 NaOHo окон LỊCI O MgCl, 40 + 180 30 30 160 25 20 + 140 15 10 + 120 100 Figure Q2-b. The nomograph for boiling point elevation of aqueous solutions. Weight % solids Boiling point rise, *F Boiling point rise, "F +HTi +ITIT HT Solution temperature, F
Transcribed Image Text:12 120 - 340 Sucrose o Citrie 10 110 + 320 acid 40 Weight % solids 35 OKraft liquid °Glycerol 8 100 -300 ONANO, OINH,sO, oK,CO, CalNO,),° oKCI 90 280 for Nomograph boiling-point elevation OHNO, OLINO, 15 80 + 260 of 50 70 240 aqueous solutions 55 ° CaCl2 O NaCi 50 45 50 200 NaOHo окон LỊCI O MgCl, 40 + 180 30 30 160 25 20 + 140 15 10 + 120 100 Figure Q2-b. The nomograph for boiling point elevation of aqueous solutions. Weight % solids Boiling point rise, *F Boiling point rise, "F +HTi +ITIT HT Solution temperature, F
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