Figure 2.5: Typical operating lines for absorbers (a) and strippers (b) on yx diagrams. Note that operating lines are not straight now. To obtain this graph the operating line for the Yx graph needs to be found and numerically converted to mole fraction values. The operating line of the process is normally determined from the slope of the line s, the compositions of the entering liquid and exiting vapor (KT YT, and the e entering vapor (YB). (The compositions of the streams entering the unit are obviously known, and the concentration of the vapor at the outlet is the desired result of the process, and hence may be set, the major variable is the ratio of the molar flows Ls/Gs). These variables will then set the concentration of the liquid outlet as shown below. (Note that this is only for absorbers, of course the operating line for strippers must be below the equilibrium line). The minimum liquid vapor ratio will be when the operating
Typical