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The FUG design method requires knowing the following about each column; a) feeding conditions, (established by the problem to be solved and by the interconnection between columns); b) the operation reflux ratio (fixed to 1.2 times the minimum reflux); c) pressure and type of condenser (fixed according to the FUG method); d) recovery fractions of key components.
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The minimum reflux provides the minimum energy requirements, and the infinite reflux provides the feasibility conditions.
For each design, different optimal reflux to minimum reflux ratio is assumed.
This method can be used to find the minimum reflux ratio, minimum number of stages at total reflux, and number of stages at given reflux ratio, as well as the reflux ratio with given number of stages.
The optimum reflux ratio was significantly higher than 1.2 times the minimum reflux ratio suggested by traditional heuristics.
The analysis of the joining of sectional trajectory bundles is carried out at minimum reflux ratio and reflux ratio above minimum.
The optimum reflux ratio predicted by the capacity variables is around 1.5 times the minimum reflux ratio, which is close to the accepted heuristic rule of 1.03 1.3 times the minimum reflux ratio.
In this work, the minimum reflux of Petyluk system for ideal ternary mixtures is considered.
The design of distillation columns requires the calculation of the minimum reflux.
Aspen Plus steady state simulation shows that this methodology estimates the minimum reflux values.
These new equations are used to develop a general method of calculating minimum reflux ratios for reactive distillation columns.
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