1. Biodiesel is formed by the reaction of lipids (fats and oils) with an alcohol in the presence of a catalyst (usually base). However, water is often in the oils and needs to be removed because the presence of water will cause the production of soap instead of biodiesel. A flash drum is used to remove water from Stearic Acid. A 175 mol/h mixture of 80 mol% Stearic Acid (SA) and 20 mol% Water (W) is flashed isothermally from 70 bar to 20 bar at 723.15 K. Assume Raoult's Law applies (an ideal mixture). Antione's Equation (log) parameters are given below for P (bar) and T (K). A B C Water 3.55959 643.748 -198.043 Stearic Acid 5.72544 3348.131 -57.825 and do a degree a. Draw a process flow diagram of freedom analysis b. Calculate the molar flow rates (mol/h) and compositions of the product streams analytically (No Excel Solver). c. Determine the molar flow rates (mol/h) and compositions graphically (Use the Pxy graph at end of document).

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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1.
Biodiesel is formed by the reaction of lipids (fats
and oils) with an alcohol in the presence of a catalyst
(usually base). However, water is often in the oils and
needs to be removed because the presence of water will
cause the production of soap instead of biodiesel. A flash
drum is used to remove water from Stearic Acid. A 175
mol/h mixture of 80 mol % Stearic Acid (SA) and 20 mol%
Water (W) is flashed isothermally from 70 bar to 20 bar at
723.15 K. Assume Raoult's Law applies (an ideal mixture).
Antione's Equation (logo) parameters are given below for P
(bar) and T (K).
A
B
C
Water 3.55959 643.748 -198.043
Stearic Acid 5.72544 3348.131 -57.825
and do a degree
a. Draw a process flow diagram
of freedom analysis
b. Calculate the molar flow rates (mol/h) and
compositions of the product streams analytically (No
Excel Solver).
c. Determine the molar flow rates (mol/h) and
compositions graphically (Use the Pxy graph at end
of document).
Transcribed Image Text:1. Biodiesel is formed by the reaction of lipids (fats and oils) with an alcohol in the presence of a catalyst (usually base). However, water is often in the oils and needs to be removed because the presence of water will cause the production of soap instead of biodiesel. A flash drum is used to remove water from Stearic Acid. A 175 mol/h mixture of 80 mol % Stearic Acid (SA) and 20 mol% Water (W) is flashed isothermally from 70 bar to 20 bar at 723.15 K. Assume Raoult's Law applies (an ideal mixture). Antione's Equation (logo) parameters are given below for P (bar) and T (K). A B C Water 3.55959 643.748 -198.043 Stearic Acid 5.72544 3348.131 -57.825 and do a degree a. Draw a process flow diagram of freedom analysis b. Calculate the molar flow rates (mol/h) and compositions of the product streams analytically (No Excel Solver). c. Determine the molar flow rates (mol/h) and compositions graphically (Use the Pxy graph at end of document).
Problem 1 Graph
Pressure (bar)
220
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
-Bubble Point
Dew Point
0.1
0.2
Water-Stearic Acid Pxy Graph at T = 723.15 K
0.3
0.4
0.5
0.6
x, y (mole fraction Water)
0.7
0.8
0.9
1
Transcribed Image Text:Problem 1 Graph Pressure (bar) 220 210 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 -Bubble Point Dew Point 0.1 0.2 Water-Stearic Acid Pxy Graph at T = 723.15 K 0.3 0.4 0.5 0.6 x, y (mole fraction Water) 0.7 0.8 0.9 1
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