XV.—On the absorption of hydrochloric acid and ammonia in water

Roscoe, Henry E.; Dittmar, W.

doi:10.1039/qj8601200128

Cited by 14 publications

(6 citation statements)

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“…7 Since then, many theoretical and experimental studies have been performed on this effect. [8][9][10][11][12][13][14] In some mixtures, azeotropes appear or disappear as the pressure changes.…”

Section: Introductionmentioning

confidence: 99%

Pressure Sensitivity Analysis of Azeotropes

Wasylkiewicz¹,

Kobylka²,

Castillo³

2002

Ind. Eng. Chem. Res.

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A new algorithm for pressure sensitivity analysis of azeotropes has been developed. The algorithm applies bifurcation theory together with an arc length continuation. This allows not only the compositions of azeotropes to be tracked as they change with pressure, but also all new azeotropes that appear within specified pressure range to be found. The algorithm is very efficient, and the computational time required for the pressure sensitivity analysis is on the order of the time necessary to calculate all azeotropes at constant pressure by using a homotopy method.

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Section: Introductionmentioning

confidence: 99%

Pressure Sensitivity Analysis of Azeotropes

Wasylkiewicz¹,

Kobylka²,

Castillo³

2002

Ind. Eng. Chem. Res.

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“…The PSD is based on the principle that the azeotropic composition can vary considerably by changing the pressure, which will make separation easier. The pressure sensitivity of azeotropes has been known since the 1860s [3,4]. Lewis [5] was the first to exploit this property of distilling azeotropic mixtures.…”

Section: Introductionmentioning

confidence: 99%

Separation of tetrahydrofuran and water using pressure swing distillation: Modeling and optimization

Lee

Cho

Kim

et al. 2011

Korean J. Chem. Eng.

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Computer simulations were performed to obtain highly pure tetrahydrofuran (THF) with over 99.9 mole% from the mixture of THF and water. Pressure swing distillation (PSD) was used since the azeotropic point between tetrahydrofuran and water can be varied with pressure. A commercial process simulator, PRO/II with PROVISION release 8.3, was used for the simulation studies. The Wilson liquid activity coefficient model was used to simulate the low pressure column, and the Peng-Robinson equation of state model was added to correct the vapor phase non-idealities for the modeling of the high pressure column. The most optimal reflux ratios and the most optimal feed stage locations that could minimize the total reboiler heat duties were determined.

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“…Knowledge regarding the sensitivity of azeotropes to pressure effects dates back to the 19th century. − Azeotropic mixtures are typically separated by either homogeneous or heterogeneous azeotropic distillation, in batch or continuous configuration. The separation process requires the addition of an entrainer and/or the use of pressure swing distillation (PSD), which exploits the dependence of the azeotrope on pressure .…”

Section: Introductionmentioning

confidence: 99%

Globally Optimal Networks for Multipressure Distillation of Homogeneous Azeotropic Mixtures

Ghougassian

Manousiouthakis

2012

Ind. Eng. Chem. Res.

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In this article, a methodology for the globally optimal synthesis of a network of vapor−liquid equilibrium flash separators that can operate at multiple pressures and separate an azeotropic mixture is presented. The objective function minimized is the total flow entering the network flashes. The proposed synthesis methodology employs the infinite-dimensional state-space (IDEAS) conceptual framework, which is shown to be applicable to the problem under consideration. The resulting infinite linear programming (ILP) IDEAS formulation is shown to have several properties that allow its simplification. The approximate solution of this IDEAS ILP is pursued through the solution of a number of finitedimensional linear programs (FLPs) of ever increasing size, whose optimum values form a sequence that converges to the ILP's infimum. The proposed optimal design methodology is general in nature and can be used to separate any number of pressure-sensitive azeotropic mixtures, with or without use of an entrainer. The method is demonstrated on a first case study involving the dual-pressure separation of a methyl acetate/methanol binary mixture, which exhibits a minimumboiling azeotrope, without using an entrainer, and a second case study involving the dual-pressure separation of a ternary mixture of water, methanol, and acetone that also exhibits a minimum-boiling azeotrope for the methanol/acetone binary mixture, again without using an entrainer. The IDEAS-generated globally optimal design is shown to be 31.54% better than an optimized, dual-pressure, traditional, two-column design for the binary mixture (case 1) and 15.15% better for the ternary mixture (case 2).

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XV.—On the absorption of hydrochloric acid and ammonia in water

Cited by 14 publications

References 0 publications

Pressure Sensitivity Analysis of Azeotropes

Pressure Sensitivity Analysis of Azeotropes

Separation of tetrahydrofuran and water using pressure swing distillation: Modeling and optimization

Globally Optimal Networks for Multipressure Distillation of Homogeneous Azeotropic Mixtures

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