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Keywords
(10)
Approximation Method
Design Method
Distillation Columns
Flow Rate
Mass Balance
Objective Function
Operant Conditioning
Satisfiability
Simplex Algorithm
Simplex Method
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PROCEDURES FOR MINIMUM REFLUX RATIO CALCULATION AND FOR THE OPTIMIZATION OF DISTILLATE FLOW RATE IN DISTILLATION COLUMNS
PROCEDURES FOR MINIMUM REFLUX RATIO CALCULATION AND FOR THE OPTIMIZATION OF DISTILLATE FLOW RATE IN DISTILLATION COLUMNS,J. A. ReyesLabarta,A. Gómez,
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PROCEDURES FOR MINIMUM REFLUX RATIO CALCULATION AND FOR THE OPTIMIZATION OF DISTILLATE FLOW RATE IN DISTILLATION COLUMNS
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J. A. ReyesLabarta
,
A. Gómez
,
A. Marcilla
This poster presents a
design method
of multicomponen t
distillation columns
that offers the possibility of solving the equilibrium equations and the mass and enthalpy balances by a rigorous method and different approximate methods, optimizing, by the simplex algorithm, the distillate
flow rate
for a specified product separation and calculating the number of stages and the optimum feed location. New methods for the calculation of the minimum reflux ratio for multicomponent
distillation columns
are also presented. The main problem involved in the rigorous calculation of the minimum reflux ratio is the great number of iterations involved, each one requiring the calculation of a distillation column. Nevertheless, this search can be orientated and simplified on considering the conditions that must be fulfilled in such an operating condition. In accordance with this, four different methods have been suggested, based in the desig method of
distillation columns
for multicomponent mixtures.
DESIGN METHOD
One problem to be solved in the design of multicomponent
distillation columns
is that the composition of the calculated residue by the traytotray procedure does not match that obtained by the material balances and, consequently, the calculation is not correct and an iterative procedure must be devised. In the present poster, the tray to tray methods proposed by Marcilla et al. (1996) for calculation of multicomponent complex distillation columns, are applied for the design of a rectifier; including an analysis of the optimum feed location, through the optimization of the distillate flow rate, for a specified product separation, leading to a residue composition equal to that obtained by material balances. The first step of the proposed procedure involves t he calculation of the range of possible design variable values (Dvalues) from the mass balances, and the second step, to calculate the optimum D that satisfies the material balance. To calculate this D optimum, the
SIMPLEX method
of convergence is used (Himmelblau, 1968), that optimizes this parameter by minimization of the
objective function
selected as the distance between the composition of the liquid phase from the last calculated stage (bottom product), x (i) , and the composition of the bottom product obtained from an overall
mass balance
(xR (i) ):
Cumulative
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