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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 16 : Single Component Two Phase Systems"
]
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
"Example 16.1 Page no. 486"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"# Variables\n",
"Tc = 972. ;\t\t\t#[degree C]\n",
"T = 273.+Tc ;\t\t\t#[K]\n",
"A = 8.799;\n",
"B = 1.615 * 10**4;\n",
"C = 0.;\n",
"mw = 26.98;\n",
"\n",
"# Calculations\n",
"# Use Antoine eqn. to get vapour pressure at 972 degree C\n",
"vP = math.exp(A-(B/(C+T))) ;\t\t\t# vapour pressure at 972 degree C-[mm Hg]\n",
"P = vP * 101.325/760 ;\t\t\t#[kPa]\n",
"# Use rate of vapourization(m) by given formula\n",
"m = 0.437 * (P * (mw**.5)/(T**0.5)) ;\t\t\t# Vapourization rate at 972 degree C-[g/(square centimetre * s)]\n",
"\n",
"# Results\n",
"print ' Vapourization rate at 972 degree C is %.1e g/(square centimetre)(s).'%m\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Vapourization rate at 972 degree C is 1.3e-04 g/(square centimetre)(s).\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
" Example 16.3 Page no. 494\n"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Variables\n",
"T1 = 110. ;\t\t\t# Temperature of chlorobenzene - [degree C] \n",
"T1F = (9*T1)/(5) + 32 ;\t\t\t# Temperature of chlorobenzene - [degree F] \n",
"P1 = 400. ;\t\t\t#Pressure of chlorobenzene - [mm of Hg]\n",
"P1_psia = P1*14.7/760 ;\t\t\t#Pressure of chlorobenzene - [psia]\n",
"T2 = 205. ;\t\t\t# Temperature of chlorobenzene - [degree C] \n",
"T2F = (9.*T2)/(5) + 32 ;\t\t\t# Temperature of chlorobenzene - [degree F] \n",
"P2 = 5. ;\t\t\t#Pressure of chlorobenzene - [atm]\n",
"\n",
"# Calculations\n",
"P2_psia = P2*14.7 ;\t\t\t#Pressure of chlorobenzene - [psia]\n",
"\n",
"# Data from steam table\n",
"x1 = [.9487,3.72,11.525,29.8,67,247,680,1543,3094];\n",
"y1 = [100,150,200,250,300,400,500,600,700];\n",
"\n",
"x2 = [P1_psia,P2_psia];\n",
"y2 = [T1F,T2F];\n",
"import matplotlib.pyplot as plt\n",
"\n",
"# Results\n",
"plt.plot(x1,y1);\n",
"plt.plot(x2,y2);\n",
"plt.plot(x1,y1);\n",
"plt.plot(x2,y2);\n",
"plt.show()\n",
"vp1 = 150. ;\t\t\t# vapour pressure of chlorobenzene from cox chart prepared at 245 degree C\n",
"vp2 = 700. ;\t\t\t# vapour pressure of chlorobenzene from cox chart prepared at 359 degree C\n",
"\n",
"print 'Temperature Estimated vapour pressure of chlorobenzene from cox chart'\n",
"print ' 245 degree C %i psia'%vp1\n",
"print ' 359 degree C %i psia'%vp2\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "display_data",
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"text": [
"<matplotlib.figure.Figure at 0x2d83e10>"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Temperature Estimated vapour pressure of chlorobenzene from cox chart\n",
" 245 degree C 150 psia\n",
" 359 degree C 700 psia\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 3,
"metadata": {},
"source": [
" Example 16.4 Page no. 495\n"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Variables\n",
"OP_Et = 400. ;\t\t\t#OSHA PEL of ethyl acetate -[ppm by volume]\n",
"OP_Mek = 200. ;\t\t\t#OSHA PEL of Methyl ethyl ketone [ppm by volume]\n",
"OP_Nba = 1.3 ;\t\t\t#OSHA PEL of n-butyl acetate [ppm by volume]\n",
"vp_Et = 96.9 ;\t\t\t# Vapour pressure of ethyl acetate obtained from CD-[mm of Hg]\n",
"vp_Mek = 94.8 ;\t\t\t# Vapour pressure of Methyl ethyl ketone obtained from CD-[mm of Hg]\n",
"vp_Nba = 20. ;\t\t\t# Vapour pressure of n-butyl acetate obtained from Perry-[mm of Hg]\n",
"\n",
"# Calculations\n",
"Chz_Et = vp_Et/OP_Et ;\t\t\t# Combined hazard criterion of ethyl acetate\n",
"Chz_Mek = vp_Mek/OP_Mek ;\t\t\t# Combined hazard criterion of Methyl ethyl ketone \n",
"Chz_Nba = vp_Nba/OP_Nba ;\t\t\t# Combined hazard criterion of n-butyl acetate\n",
"\n",
"# Results\n",
"print 'Combined hazard criterion of solvents in increasing order are :'\n",
"print 'Ethyl acetate : %.2f'%Chz_Et\n",
"print 'Methyl ethyl ketone : %.2f'%Chz_Mek\n",
"print 'n-butyl acetate : %.2f'%Chz_Nba\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Combined hazard criterion of solvents in increasing order are :\n",
"Ethyl acetate : 0.24\n",
"Methyl ethyl ketone : 0.47\n",
"n-butyl acetate : 15.38\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "code",
"collapsed": true,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
