a) Draw a block diagram of the process. b) Define the streams and units in the block diagram. c) Mark the streams on temperature versus concentration diagram and enthalpy concentration diagram.
a) Draw a block diagram of the process. b) Define the streams and units in the block diagram. c) Mark the streams on temperature versus concentration diagram and enthalpy concentration diagram.
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:Q1. Sodium sulphate decahydrate crystals (NazSO4.10H2O), DH are produced in a
continuous vacuum crystallizer. Concentrated sodium sulphate solution from an evaporation
system with a flow rate of 2000 kg/h at 80°C and 1 atm is mixed with 4000 kg/h of a saturated
aqueous recycle filtrate of sodium sulphate solution at 20°C and 1 atm. The mixture is sent to
the vacuum crystallizer, operating at 20°C and 50 mmHg, to produce water vapor and magma
of 25 wt% crystals and 75 wt% saturated solution. The magma is then sent to a filter, from
which filtrate is recycled.
a) Draw a block diagram of the process.
b) Define the streams and units in the block diagram.
c) Mark the streams on temperature versus concentration diagram and enthalpy
concentration diagram.
Determine:
d) crystal production rate (on a dry basis).
e) evaporation rate of water in vacuum crystallizer.
f) the energy required in vacuum crystallizer.
120
100
80
60
Na so, + solution
solution
40
20
Na, so, 10H,0+ solution
4.
oF
-20
0.1
0.2
0.3
0.4
0.5
0.6
Concentration of Na,so, kg Na, so, kg solution
Figure Ql-a. Solubility curve of sodium sulfate in water.
Temperature, "c
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