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+//Transport Processes and Seperation Process Principles
+//Chapter 12
+//Example 12.8-1
+//Liquid Liquid and Fluid Solid Seperation Process
+//given data
+//for 80% extraction, unextracted fraction, Es=0.2
+Es=0.2;
+//Dab*(t/a*a) is constant
+t1=3.11;//time reqd to leach 80% of solution
+a2=1.5/2;//radius of reduced particale size
+a1=2/2;//radius od the particle size
+t2=(t1*a2*a2)/(a1*a1);
+mprintf("the time of leaching= %f h",t2)