An output multiplicity in binary distillation: Experimental verification

Koggersbøl, A.; Andersen, Torben Ravn; Bagterp, J.; Jørgensen, Sten Bay

doi:10.1016/0098-1354(96)00147-0

Cited by 18 publications

(18 citation statements)

References 2 publications

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“…They stated that hysteresis may be experienced during the actual operation. Furthermore, Kienle et al (1995) and Koggersbøl et al (1996) confi rmed the existence of multiple steady states in an experimental way when separating a binary mixture.As regard to azeotropic distillation operations, Güttinger et al (1997) found two stable steady states caused by the vapour-liquid equilibrium for the ternary homogeneous methanol-methyl butyratetoluene system in an industrial pilot column. Besides, Dorn et al (1998) verifi ed the existence of a third unstable steady state and studied the transient behavior of that azeotropic column.…”

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confidence: 81%

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Strategies for Starting Up Azeotropic Distillation Columns with Multiple Steady States

Benz¹,

Francesconi²,

Scenna³

2004

Can J Chem Eng

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T here are several works analysing multiple solutions in ideal, azeotropic and/or reactive distillation columns. Jacobsen and Skogestadt (1991), Cairns and Furzer (1990), Bekiaris et al., (1993Bekiaris et al., ( , 1996, Gani and Jørgensen (1994), Hauan et al. (1995), Kienle and Marquardt (1991), Scenna (1997), andMohl et al. (1999), among others, have considered their origins, the hysteresis curve behaviour or the infl uence of different variables upon them. Jacobsen and Skogestad (1995) analysed the operability and instability of binary distillation column with multiple steady state output during continuous operation. They stated that hysteresis may be experienced during the actual operation. Furthermore, Kienle et al. (1995) and Koggersbøl et al. (1996) confi rmed the existence of multiple steady states in an experimental way when separating a binary mixture.As regard to azeotropic distillation operations, Güttinger et al. (1997) found two stable steady states caused by the vapour-liquid equilibrium for the ternary homogeneous methanol-methyl butyratetoluene system in an industrial pilot column. Besides, Dorn et al. (1998) verifi ed the existence of a third unstable steady state and studied the transient behavior of that azeotropic column. Also, Lee et al. (1999) found periodic oscillations and a limit cycle (sustained oscillations) while analysing the dynamic behaviour of the open-loop column. Bossen et al. (1993) found four steady states for the dehydration of ethanol with benzene by dynamic simulation. Moreover, by means of a dynamic experiment, Müller and Marquardt (1997) verifi ed both the existence of multiple steady states in a heterogeneous azeotropic distillation (ethanol dehydration with cyclohexane as entrainer) and the hysteresis behaviour due to multiple steady states. On the other hand, Chien et al. (1999) analysed the dynamic behaviour of another heterogeneous azeotropic column (isopropyl alcohol-cyclohexane-water). They found three branches of steady states. The lowest and highest solutions were stable and the intermediate one was unstable. Besides, a bifurcation analysis showed that different operating regions could be placed in an operating variable diagram (heat duty vs. refl ux). These operating zones of the column (and different steady states) were characterised by the ratios of entrainment to other components and their potential azeotropes. Chien et al. (1999) suggested a particular desirable start-up strategy, but they did not develop it. Later, Chien et al. (2000) developed a suitable operating procedure for reaching the desirable high-purity steady state. Gani and Jorgensen (1994) proposed that the displacement of the internal composition front could be the cause of the possible connection between multiplicity and operability. Here we will show that * Author to whom correspondence may be addressed. E-mail address: sbenz@frro.utn.edu.ar The operability of azeotropic distillation columns with multiplicity is analysed during start-up by dynamic simulation. Different steady states can...

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confidence: 81%

mentioning

confidence: 81%

Strategies for Starting Up Azeotropic Distillation Columns with Multiple Steady States

Benz¹,

Francesconi²,

Scenna³

2004

Can J Chem Eng

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“…Kienle et al (1995) confirmed the existence of multiple steady states when separating a binary mixture of methanol-1propanol in a pilot plant distillation column. Also Koggersbøl et al (1996) verified it in a semi-industrial scale distillation column separating a mixture of methanol and isopropanol. Besides, with regard to azeotropic mixtures, Güttinger et al (1997) found two stable steady states caused by the vapour-liquid equilibrium for the ternary homogeneous system methanol-methyl butyrate-toluene on an industrial pilot column.…”

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confidence: 88%

An Extensive Analysis on the Start‐up of a Simple Distillation Column with Multiple Steady States

Benz¹,

Scenna²

2002

Can J Chem Eng

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The impact of start‐up procedures on the behaviour of simple distillation columns with multiple steady states is analyzed. A well‐known system with hysteresis is studied in this paper and transient responses for a binary distillation column yielding different steady states during the start‐up operation are shown. Several dynamic simulation results showing an interesting behaviour are presented. Through the examination of the profile evolutions corresponding to given start‐up policies, it can be seen how the column arrives to different steady states. It is shown that it is possible to identify a set of critical values for the start‐up supervision. Also, guidelines of general validity are achieved with the aim of finding the appropriate start‐up policy to obtain the desired solution.

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“…Equation represents a relationship that is nonlinear but monotonic (here, the gain K is continuously decreasing as the duty and purity increase). Further research has revealed that it is possible that such input–output relations be nonmonotonic (i.e., the gain K may change sign), leading to multiplicities (Figure ). An input multiplicity denotes the case where multiple sets of MV values lead to the same value of the CVs.…”

Section: Dynamic Intensification Of Distillation Operationsmentioning

confidence: 99%

“…Multiplicity has been demonstrated both computationally and experimentally for distillation columns. For example, Koggersbøl et al (Figure ) studied the steady‐state behavior of a binary distillation column separating methanol and isopropanol, showing that multiple values of, e.g., distillate purity and molar boilup rate (and, hence, reboiler duty) are possible for the same value of the volumetric reflux. In their work, Jacobsen and Skogestad considered a binary column processing a propanol–acetic acid mixture, revealing, among others, an output multiplicity in the distillate purity, with the reboiler being the MV (Figure ).…”

Section: Dynamic Intensification Of Distillation Operationsmentioning

confidence: 99%

Dynamic process intensification of binary distillation based on output multiplicity

2019

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Process intensification focuses largely on process and equipment design. Much less emphasis has been placed on operational changes to achieve cost savings and increased efficiency. This article introduces the concept of dynamic intensification, defined as changes to the dynamics, operating strategy and/or control of a process that lead to a substantially more efficient processing path. This idea is illustrated in the context of binary distillation. Output multiplicity properties are exploited to establish a new periodic operating mode based on switching between two auxiliary products, which, on a time‐average basis, is more energy efficient than steady‐state operation. An extensive case study is presented concerning the distillation of a propanol–acetic acid mixture, confirming the theoretical developments. In contrast to previous research (e.g., on cyclic distillation), the present concept has significant advantages as it relies on existing hardware and exploiting system nonlinearity, rather than using specialized equipment operated in a discontinuous fashion. © 2018 American Institute of Chemical Engineers AIChE J, 65: 1162–1172, 2019

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An output multiplicity in binary distillation: Experimental verification

Cited by 18 publications

References 2 publications

Strategies for Starting Up Azeotropic Distillation Columns with Multiple Steady States

Strategies for Starting Up Azeotropic Distillation Columns with Multiple Steady States

An Extensive Analysis on the Start‐up of a Simple Distillation Column with Multiple Steady States

Dynamic process intensification of binary distillation based on output multiplicity

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