The system is built from a mixer in which the input current mixes with the current recycled, from one reactor followed by another separation, where the product leaves and the reactants are recycled. The system studies the production of ethanol C2H5OH from water H2O and ethene C2H4, with the ratio 1: 1, where the amount of food is 150 mol/hour and 40% is converted ether. The product stream removes 75% ethanol, 15% ether and 10% water. Determine amount of recycle and all the unknowns.