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diff --git a/Chemical_Reaction_Engineering_by_O._Levenspiel/ch23.ipynb b/Chemical_Reaction_Engineering_by_O._Levenspiel/ch23.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 23 :\n",
+      "\n",
+      "Fluid-Fluid Reactions: Kinetics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 23.1 pageno : 536"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math \n",
+      "\n",
+      "# Variables\n",
+      "k = 10.**6;\n",
+      "Kag_a = 0.01              #mol/hr. m**3. Pa\n",
+      "fl = 0.98;\n",
+      "Kal = 1.;\n",
+      "HA = 10.**5;              # very low solubility\n",
+      "DAl = 10.**-6;\n",
+      "DBl = DAl;\n",
+      "PA = 5*10.**3               #Pa\n",
+      "CB = 100.                   #mol/m3\n",
+      "b = 2.      \n",
+      "a = 20.                     #m2/m3\n",
+      "\n",
+      "# Calculations\n",
+      "Mh = math.sqrt(DAl*k*CB*CB)/Kal;\n",
+      "Ei = 1+(DBl*CB*HA/(b*DAl*PA));\n",
+      "E = 100.\n",
+      "print \" Part a\"\n",
+      "\n",
+      "res_total = (((1/(Kag_a))+(HA/(Kal*a*E))+(HA/(k*CB*CB*fl))))            #Total Resismath.tance\n",
+      "f_gas = (1/(Kag_a))/res_total;              #fraction of resismath.tance in gas film\n",
+      "f_liq = (HA/(Kal*a*E))/res_total;           #fraction of resismath.tance in liquid film\n",
+      "\n",
+      "\n",
+      "# Results\n",
+      "print \" Fraction of the resistance in the gas film is %f\"%(f_gas)\n",
+      "print \" Fraction of the resistance in the liquid film is %f\"%(f_liq)\n",
+      "print \" Part b\"\n",
+      "print \" The reaction zone is in the liquid film\"\n",
+      "print \" Part c\"\n",
+      "if Ei>5*Mh:\n",
+      "     print \" We have pseudo 1st order reaction in the film\"\n",
+      "\n",
+      "rA = PA/(((1/(Kag_a))+(HA/(Kal*a*E))+(HA/(k*CB*CB*fl))));\n",
+      "print \" Part d\"\n",
+      "print \" The rate of reactionmol/m3.hr) is %f\"%(rA)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " Part a\n",
+        " Fraction of the resistance in the gas film is 0.666667\n",
+        " Fraction of the resistance in the liquid film is 0.333333\n",
+        " Part b\n",
+        " The reaction zone is in the liquid film\n",
+        " Part c\n",
+        " We have pseudo 1st order reaction in the film\n",
+        " Part d\n",
+        " The rate of reactionmol/m3.hr) is 33.333331\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file