Methods for solving multicomponent distillation problems of design type at total reflux.
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概要
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In order to solve design type problems of multicomponent distillation at total reflux, that is, to determine the minimum number of stages for a given separating condition, a rigorous method is proposed, which consists of the following two calculating loops, the minor and the major.The minor loop is to determine the minimum number of stages by continuing stage-by-stage calculation based on an assumed liquid composition on a feed plate(Egs. (1) to (3) for an enriching section and Eqs. (4) to (6) for a stripping section) until the given separating condition is satisfied. The fraction of stage at the top and bottom of a column is determined by quadratic approximation.The major loop is to determine the correct liquid composition on the feed plate. An assumed liquid composition on the feed plate, which is used in the minor loop, is corrected using the concept of normalized θ-method4) to satisfy the component material balance (Eqs. (7) to (11)). The calculation is terminated when the material balances for all components are satisfied or when the value of θf becomes unity within a given tolerance, otherwise returns to the minor loop. The flow chart of the procedure is given in Fig. 2.The results of numerical examples are shown in Table 3 and Fig. 3, that demonstrate the stable convergence of the method.The proposed method provides i) algorithm simpler than that of Chien's method1) and ii) wide applicability to systems of not only nonideal mixture but also wide boiling mixture.
- 公益社団法人 石油学会の論文
公益社団法人 石油学会 | 論文
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