McCabe-Thiele graphical method

A useful method for a binary mixture employs an analysis based on the McCabe-Thiele graphical method. In addition to the usual assumptions of adiabatic column and equimolal overflow on the trays, the following procedure assumes neghgible holdup of hquid on the trays, in the column, and in the condenser. 

The McCabe-Thiele graphical method is applied using the Y-X diagram. The equilibrium curve is first plotted from the given data (Figure 6.3). A temperature coordinate is also included in the diagram (nonlinear) to determine the condenser, reboiler, and tray temperatures. 

Figure 3 McCabe-Thiele graphical method for determining the number of equilibrium stages. Example 3.6.

The McCabe-Thiele graphical method uses three important types of line the operating lines, an equilibrium line and a g-line (feed line). 

Use the McCabe-Thiele graphical method to determine the number of equilibrium stages for completely immiscible systems. 

FIGURE 5.3-6 Summary of McCabe-Thiele graphical method for binaty distillation. 

NUMBER OF m AL STAGES FOR VARIABLE UNDERFLOW. When the underflow and overflow vary from stage to stage, a modification of the McCabe-Thiele graphical method may be used for calculations. The terminal points on the operating line are determined using material balances, as was done in Example... 

Combine material-balances information from the McCabe-Thiele graphical method with interphase mass-transfer considerations to determine the packed height of the rectifying and stripping sections of a continuous-contact binary distillation tower. 

Gas absorption and liquid-liquid extraction are analogous in that in each there are two carrier streams and at least one solute to be partitioned between them. The following example illustrates the application of the McCabe-Thiele graphical method to a gas absorption problem. Mole units are used. 

On the basis of the McCabe-Thiele graphical method Pohl [143] has derived a numerical procedure for calculating the conditions of the lower column section for mixtures containing a very low concentration of the light component. The equilibrium... 

McCabe-Thiele graphical method. The equations obtained in the preceding section can be represented graphically on a McCabe-Thiele diagram. The operating lines, equations 7.6.7 and 7.6.8, are plotted on x-y coordinates along with the equilibrium line, which is the locus of equilibrium (x, y) compositions. The latter are obtained from tabulations or equations like 7.6.6. 

The more precise McCabe-Thiele graphical method of calculation of solute concentration in terms of the number of theoretical stages in a given length of column can be applied to ion-exchange equally with solvent extraction and is discussed by Pfeiffer. ... 

The conventional McCabe-Thiele graphical method for analysis of binary mixtures was applied to determine the number of theoretical plates necessary for the separation, 11,3 theoretical plates are required for the rectifying section, and 9.4 for the stripping section. Thus a total of 20,7 theoretical plates are required. Since the value of chosen was 70 per... 

It is easy to understand the two basic modes using binary distillation. This involves use of McCabe-Thiele graphical method described below. 

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