Distillation Hengstebeck

For multicomponent mixtures the method of Hengstebeck can be used. Kister s book Distillation Design, by McGraw-Hill, 1992 explains the method and is easier to find than the original book of Hengstebeck. 

Hengstebeck, R. J., Distillation-Principles and Design Practices, Reinhold Publishing, 1961. 

The distribution of components for the distillate and the bottoms is given by the Hengstebeck-Geddes equation [124,125, 126] ... 

The basic theory of batch distillation is given in Volume 2, Chapter 11 and in several other texts Hart (1997), Perry et al. (1997) and Walas (1990). In the simple theoretical analysis of batch distillation columns the liquid hold-up in the column is usually ignored. This hold-up can have a significant effect on the separating efficiency and should be taken into account when designing batch distillation columns. The practical design of batch distillation columns is covered by Hengstebeck (1976), Ellerbe (1997) and Hart (1997). 

HENGSTEBECK, R. J. (1946) Trans. Am. Inst. Chem. Eng. 42, 309. Simplified method for solving multicomponent distillation problems. 

Hengstebeck, R.J., Jr. Distillation -Principles and Design Practice, Reinhold, New York, 1961. 

Hengstebeck, R.J. An Improved Shortcut for Calculating Difficult Multicomponent Distillations, ... 

R.J. Hengstebeck, Distillation principles and design procedures, Reinhold Publishing Co., New-York (1961). 

The distribution of nonkeys actually depends somewhat on the reflux ratio. For instance, in the case of Example 13.10, the distributions at minimum trays (total reflux) and minimum reflux are substantially different. Often it turns out, however, that the distributions predicted by Eq. (13.119) are close to those at finite reflux whenever R is near 1.2Rm, which is often near the economic value for the reflux ratio. Further discussion of this topic is by Hengstebeck (Distillation, 1961) and Stupin and Lockhart (1968) whose work is summarized by King (1980, p. 434). Knowledge of the complete distribution is needed for estimation of top and bottom temperatures and for determination of the minimum reflux by the method to be cited. 

In the years from 1940 through the 1960s, several notable shortcut fractionation methods were published. Of these, one method that included several of these earlier methods has stood out and is today more accepted. Fenske, Underwood, and Gilliland [9-12] are the core of this proposed method. Yet one more entry is added, the Hengstebeck [13] proposed method to apply multicomponent distillation. As these earlier methods pointed out only two component separations (called binary systems), the Hengstebeck added contribution is most important for multicomponent applications. 

Hengstebeck, R. J., Stage and Reflux Requirements, Distillation Principles and Design Procedures, Robert E. Krieger, Huntington, NY, 1976, Charts 7 and 8. 

Hengstebeck a (15) procedure extends the x-y diagram to multicomponent distillation, A multicomponent separation is treated as a binary separation between the keys, Flows and compositions are based on the two keys alone, that is,... 

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