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diff --git a/Chemical_Reaction_Engineering_by_O._Levenspiel/ch12.ipynb b/Chemical_Reaction_Engineering_by_O._Levenspiel/ch12.ipynb
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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 12 : Compartment Models"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.1 page no : 289"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "tg = (8.*(9.-6)*(0.5)+11.*(15.-9)*(0.5))/((15.-6)*0.5)              #sec\n",
+      "tl = 40.                                                            #sec\n",
+      "vg = 0.5\n",
+      "vl = 0.1;\n",
+      "\n",
+      "# Calculations\n",
+      "Vg = tg*vg;\n",
+      "Vl = tl*vl;\n",
+      "G = Vg*10\n",
+      "L = Vl*10\n",
+      "Stagnant = (100-G-L)\n",
+      "\n",
+      "# Results\n",
+      "print \" fraction of gas is %.f %%\"%(G)\n",
+      "print \" fraction of liquid is %.f %%\"%(L)\n",
+      "print \" fraction of Stangnant liquid is %.f %%\"%(Stagnant)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " fraction of gas is 50 %\n",
+        " fraction of liquid is 40 %\n",
+        " fraction of Stangnant liquid is 10 %\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 12.2 page no : 290"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "CAo = 1.;\n",
+      "XA = 0.75               #present\n",
+      "CA = 1-XA;\n",
+      "\n",
+      "# Calculations\n",
+      "kt1 = (CAo-CA)/CA;\n",
+      "kt2 = 3*kt1;            #volume is reduced by 1/3\n",
+      "CA_unconverted = 1./(kt2+1);\n",
+      "XA = 1-CA_unconverted   #New XA after replacing the stirrer\n",
+      "\n",
+      "# Results\n",
+      "print \" New Conversion expected is %.1f %%\"%(XA*100)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        " New Conversion expected is 90.0 %\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file