The Wang-Henke Bubblepoint Method

Initial estimates of the temperature are made by taking linear variation between estimated overhead dewpoint and bottoms bubblepoint. The vapor rates are estimated on the basis of constant molal overflow with due regard to input or output sidestreams. 

The system represented by the matrix Eq. (13.198) consists of linear equations that are solved for the liquid mol fractions xtj. 

In general the mol fractions will not sum to unity, so that they are normalized as 

The convergence criterion imposes a tolerance on the differences between successive iterations of the temperatures 

New values of the stage temperatures T, are calculated as bubblepoints with the normalized Xjj. Initially the effect of vapor compositions on is ignored and the vapor compositions are found with 

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Separations 404 Specifications 405 The MESH Equations 405 The Wang-Henke Bubblepoint Method 408 The SR (Sum-Rates) Method 409 SC (Simultaneous Correction) Method 410... 

Figure 13.17. Algorithm of the BP (bubblepoint) method for distillation separations [Wang and Henke, Flydrocarbon Processing 45(S), 155-166 (1963) Henley and Seader, 1981],...

BP (bubblepoint) methods. Temperatures are corrected iteratively by determinations of bubblepoints. The method is satisfactory for mixtures with relatively narrow ranges of volatilities. The parent program of this type is that of Wang and Henke (1966) which is flowsketched on Figure 13.17 and described in the next section. The availability of a FORTRAN program was cited earlier in this section. 

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