Experimentelle und theoretische Untersuchung des Trennverhaltens viskoser organischer Systeme in Packungskolonnen

Wolf, Tim S.; Bradtmöller, Christian; Janzen, Anna; Scholl, Stephan; Kenig, Eugeny Y.

doi:10.1002/cite.201250636

Cited by 1 publication

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“…Thereby, it can be distinguished between effects of the variation of viscosity and the concurring changes in other physical properties, such as surface tension and separation factor. The change of separation efficiency due to viscosity, which cannot be predicted satisfyingly by widely used rate-based models, 43 was shown to be reflected by a modeling approach based on hydrodynamic analogies by Wolf et al 44 Therefore, the new test system is beneficial in the assessment and improvement of theoretical models for vapor/liquid separation efficiency of the respective equipment.…”

Section: Resultsmentioning

confidence: 99%

Proposal for a Viscous Test Mixture—Densities, Viscosities, and Vapor–Liquid Equilibrium Data of the Binary Mixture 2-Methyl-2-butanol + 2-Methyl-1-propanol

Bradtmöller

Scholl

2015

J. Chem. Eng. Data

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Standardized test mixtures are needed to determine the effectiveness and efficiency of distillation columns and their internals. Despite the wide range of different test mixtures and the variations in their physical properties, no standard test mixture is available that contributes viscosities above 1.5 mPa s at typical distillation conditions. To investigate the impact of viscosity on separation effectiveness and efficiency and validate models for higher viscosities, a new test mixture is proposed. On the basis of a screening, the binary mixture 2-methyl-2-butanol/2-methyl-1-propanol was chosen, showing liquid phase viscosities up to 5 mPa s and satisfying the requirements for separation efficiency tests. For this mixture, vapor–liquid equilibria were measured from 2 to 95 kPa. A slight negative deviation from ideal behavior is accounted for using the nonrandom two-liquid model. Furthermore, for both pure substances as well as their mixtures liquid densities were determined from 293.15 to 363.15 K and viscosities in a temperature range from 273.15 to 333.15 K. Nonidealities were modeled with a Redlich–Kister approach. Thus, vital information for the assessment of separation efficiency with a new test mixture is given and subsequent studies on the influence of viscosity on fluid dynamics and separation efficiency in distillation columns are enabled.

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Section: Resultsmentioning

confidence: 99%