9.11 In a certain binary distillation, the overhead vapor condenser must be run at a temperature requiring mild refrigeration, and the available refrigeration capacity is very limited. The reboiler temperature is very high, and the available high-temperature heat supply is also limited. Conse. quently the scheme shown in Fig. 9.56 is adopted, where the intermediate condenser E and reboiler S operate at moderate temperatures. Condensers C and E are total condensers, delivering liquids at their bubble points. Reboiler S is a total vaporizer, delivering saturated vapor. Heat losses are negligible, D=W, the external reflux ratio R=L0/D=1.0, and other conditions are shown on the figure. The system is one which follows the McCabe-Thiele assumptions (HLx and HGy curves are straight and parallel). Feed is liquid at the bubble point. (a) Per mole of feed, compute the rates of flow of all streams, the relative size of the two condenser heat loads, and the relative size of the two vaporizer heat loads. (b) Establish the coordinates of all difference points. Sketch the Hxy diagram and locate the difference points, showing how they are related to the feed. Show the construction for trays. (c) Sketch the xy diagram, show all operating lines, and locate their intersections with the 45 diagonal. Show the construction for trays