Extraction of Caprolactam with Toluene in a Pulsed Disc and Doughnut Column–Part III: Mass Transfer Characteristics

Delden, van Ml; Vos, G.S.; Kuipers, N.J.M.; Haan, de Ab André

doi:10.1080/07366290600760664

Cited by 11 publications

(18 citation statements)

References 17 publications

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“…[7] The resulting experimentally determined concentration profiles for the forward and back-extraction are shown in Figs. 6a and 6b respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Concentration profiles were determined from Caprolactam Extraction 641 chemical analysis of separate samples of both phases, which were obtained via 8 sample ports placed along the column. [7] Chemicals All chemicals were used as received. Heptane (purity 99%) and heptanol (purity 99%) were supplied by Fluka (USA) and 1-caprolactam (CPL) (purity grade) by DSM (The Netherlands).…”

Section: Experimental Set-up and Procedures Experimental Set-upmentioning

confidence: 99%

“…[7] All hydraulic and mass transfer experiments were performed at steady state, which was created by maintaining a constant interface level. The time needed to reach a constant concentration profile is approximated by the time needed for three to four column volume replacements, which was already confirmed for extraction with toluene.…”

Section: Experimental Set-up and Procedures Experimental Set-upmentioning

confidence: 99%

“…Additionally, from the above the influence of mass transfer on the hydraulic characteristics could be determined and compared with the results at equilibrium conditions. The determined separation efficiency and mass transfer influence were compared with those obtained for toluene as a benchmark solvent [7] and the concentration profiles were correlated with the backflow model.…”

Section: Introductionmentioning

confidence: 99%

“…An accurate prediction of the mass transfer is, however, not possible, because of the strong change in system characteristics along the column length, which influence hydraulics, mass transfer, and the axial dispersion at the same time. [7] The mass transfer performance of the mixed solvent system needs therefore to be investigated experimentally in a pilot scale column.…”

Section: Introductionmentioning

confidence: 99%

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Extraction of Caprolactam with an Alternative Benign Solvent in a Pulsed Disc and Doughnut Column

Delden

Vos

Kuipers

et al. 2007

Solvent Extraction and Ion Exchange

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Caprolactam is obtained by extraction using organic solvents like benzene, toluene, or chlorinated hydrocarbons. As an alternative solvent, the mixed solvent heptane-heptanol (40 mass %) was selected in previous studies based on a relatively high distribution ratio of caprolactam, a low mutual solvent solubility, beneficial physical properties, and a low distribution ratio of impurities. Now, the hydraulic and mass transfer characteristics of the extraction of caprolactam in a pulsed disc and doughnut column (PDDC) were investigated using the benign solvent. The results were compared to those for toluene.The PDDC showed qualitatively comparable operational characteristics for both solvents. In the hydraulic experiments the mixed solvent showed smaller drop diameters and hold-ups, required lower pulsation intensities for regime transitions, but the operational windows are slightly smaller. For both solvents, mass transfer resulted in increasing drop diameters and pulsation intensities required for regime transition. In the forward extraction the mixed solvent was superior, where HETS/m ¼ 0.26 to 0.37, compared to 0.42 to 0.67 for toluene, while less theoretical stages are required as well. For the back-extraction HETS/m ¼ 0.33 to 0.40 for the mixed solvent compared to 0.30 to 0.37, but toluene requires the lower amount of theoretical stages.The hydraulic characteristics at equilibrium and concentration profiles in both the forward and back-extraction were described accurately using the developed models.

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“…[7] The resulting experimentally determined concentration profiles for the forward and back-extraction are shown in Figs. 6a and 6b respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: Experimental Set-up and Procedures Experimental Set-upmentioning

confidence: 99%

Section: Experimental Set-up and Procedures Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Extraction of Caprolactam with an Alternative Benign Solvent in a Pulsed Disc and Doughnut Column

Delden

Vos

Kuipers

et al. 2007

Solvent Extraction and Ion Exchange

Self Cite

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Prediction of mass transfer coefficients in a pulsed disc and doughnut extraction column

2011

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A study of the mass transfer performance for a pulsed disc and doughnut extraction column has been presented for a range of operating conditions. The mass transfer performance has been investigated for both directions of mass transfer. This study has examined the mass transfer coefficients which has incorporated the effects of back‐mixing in the continuous phase. The effect of operating variables including pulsation intensity and dispersed and continuous phase velocities on volumetric overall mass transfer coefficient has been investigated. The experiments showed that mixer‐settler, transition and emulsion regimes exist in the column depending on the pulse characteristics. In the present work, effective diffusivity is substituted for molecular diffusivity in the Gröber equation for estimation of overall mass transfer coefficients. The enhancement factor is determined experimentally and there from a single empirical correlation is derived for prediction of enhancement factor in terms of Reynolds number, holdup and Eötvös number for all operating regimes and each mass transfer direction. The experimental results are in very good agreement with the values calculated by the proposed equation. © 2011 Canadian Society for Chemical Engineering

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The performance of pulsed scale-up column for permeable of selenium and tellurium ions to organic phase, case study: Disc and doughnut structure

Shakib

Torkaman

Mostaedi

et al. 2020

Chemical Engineering and Processing - Process Intensification

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Extraction of Caprolactam with Toluene in a Pulsed Disc and Doughnut Column–Part III: Mass Transfer Characteristics

Cited by 11 publications

References 17 publications

Extraction of Caprolactam with an Alternative Benign Solvent in a Pulsed Disc and Doughnut Column

Extraction of Caprolactam with an Alternative Benign Solvent in a Pulsed Disc and Doughnut Column

Prediction of mass transfer coefficients in a pulsed disc and doughnut extraction column

The performance of pulsed scale-up column for permeable of selenium and tellurium ions to organic phase, case study: Disc and doughnut structure

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