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
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: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: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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