1986
DOI: 10.1002/cjce.5450640507
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A modified “inside‐out” algorithm for simulation of multistage multicomponent separation processes using the UNIFAC group‐contribution method

Abstract: A computational procedure using a modification of Boston and Sullivan's "inside-out" multistage multicomponent separation algorithm (1974) is developed. In order to improve convergence behavior for problems involving mixtures with highly nonideal liquid phases, a two-parameter model is used to describe liquid-phase compositional effects upon the K-factor. The quasi-Newton methods of Mehra et al. (1983) and Nghiem (1983) are applied to solving various sets of solution variables in the proposed algorithm. Activi… Show more

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Cited by 7 publications
(6 citation statements)
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“…[83,84] A modified "inside-out" algorithm was developed using the UNIFAC group-contribution method [85] for simulating multi-stage, multicomponent separation processes, such as distillation, absorption, and reboiled-absorption. [17,86] An algorithm was described for performing liquid-liquid equilibrium, 3-phase bubble-point, and 3-phase equilibrium flash calculations. [87] A new algorithm was developed for steady-state simulation of multi-stage separation in distillation columns, absorption columns, and reboiled absorbers.…”
Section: Computational Algorithms For Equipment Designmentioning
confidence: 99%
“…[83,84] A modified "inside-out" algorithm was developed using the UNIFAC group-contribution method [85] for simulating multi-stage, multicomponent separation processes, such as distillation, absorption, and reboiled-absorption. [17,86] An algorithm was described for performing liquid-liquid equilibrium, 3-phase bubble-point, and 3-phase equilibrium flash calculations. [87] A new algorithm was developed for steady-state simulation of multi-stage separation in distillation columns, absorption columns, and reboiled absorbers.…”
Section: Computational Algorithms For Equipment Designmentioning
confidence: 99%
“…Since they apply Newton-type methods (possibly complemented with some parametric continuation approach), they exhibit similar numerical properties as these types of algorithms. Most process simulation packages implement simultaneous methods for unit operations but offer both partitioning and simultaneous alternatives for specific types of unit operations, for example, distillation, absorption and stripping towers (for completeness, the most common partitioning solution scheme for separation towers is the inside-out method by Boston and Sullivan Jr., [19] Saeger and Bishnoi, [20] and Jelínek [21] ). As a rule of thumb, we recommend partitioning methods for solving mildly nonideal separations and simultaneous methods for solving highly non-ideal or reactive separations.…”
Section: Solution Of the Single Unit Operation Modelsmentioning
confidence: 99%
“…Russell [8] suggested changes to the inside out method by using a quasi-Newton approach to achieve all enthalpy balance and performance specifications directly. Saeger and Bishnoi [9] suggested a modified inside out algorithm for highly non ideal liquid solutions using a two parameter activity coefficient model. Jelinek [10] extends the methods suggest by Russell [8] by providing a detailed methodology and discusses certain advantages and potential shortcomings.…”
Section: Introductionmentioning
confidence: 99%