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diff --git a/905/CH7/EX7.2/7_2.sce b/905/CH7/EX7.2/7_2.sce
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+clear;
+clc;
+
+// Illustration 7.2
+// Page: 433
+
+printf('Illustration 7.2 -  Page: 433\n\n');
+
+// solution
+//*****Data*****//
+//  'b'-solvent   'f'-feed   'r'-raffinate   'e'-extract   'c'-one of the   // component in  feed
+F = 50; // [feed rate, kg/h]
+S = 50; // [solvent rate, kg/h]
+xcf = 0.6;
+xbf = 0;
+ycs = 0;
+ybs = 1.0;
+// The equilibrium data for this system can be obtained from Table 7.1 and    // Figure 7.6
+// Plot streams F (xcF = 0.6, xBF = 0.0) and S (yes = 0.0, yBs = 1.0). After  // locating streams F and S, M is on the line FS; its exact location is found // by calculating xcm from
+
+xcm = (F*xcf+S*ycs)/(F+S);
+
+// From figure 7.8
+xcr = 0.189;
+xbr = 0.013;
+yce = 0.334;
+ybe = 0.648;
+M = F+S; // [kg/h]
+// From equation 7.8 
+E = M*(xcm-xcr)/(yce-xcr); // [kg/h]
+R = M-E; // [kg/h]
+printf("The extract and raffinate flow rates are %f kg/h and %f kg/h respectively.\n\n",E,R);
+printf("The compositions when one equilibrium stage is used for the separation is %f and %f in raffinate phase for component b and c respectively and %f and %f in extract phase for component b and c respectively.\n\n",xcr,xbr,yce,ybe);
+\ No newline at end of file