Flooding Characteristics And Separation Efficiencies of Pulsed Sieve-Plate Extraction Columns

Smoot, L.D.; Mar, Brian W.; Babb, A. L.

doi:10.1021/ie51396a030

Cited by 37 publications

(19 citation statements)

References 3 publications

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“…This was the flooding due to excessive pulsing in the emulsion regime of operation. Thornton [18], McAllister et al [25], Smoot and Babb, [26], Kagan et al [2], Berger and Walter [19], Lorenz et al [4] and Tribess and Brunello [20] have also observed the same results. Kagan et al [2] have also used the kerosene-water system and found that, in mixer-settler regime as the pulse velocity increases, the capacity of the column increases.…”

Section: Effect Of Pulse Velocity On Flooding Curvementioning

confidence: 69%

Hydrodynamics of a Pulsed Sieve Plate Extraction Column

Somkuwar

Kolhe

Rathod

2014

Indian Chemical Engineer

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Hydrodynamic characteristics, such as drop size, dispersed phase hold-up and flooding have been studied experimentally in a pulsed sieve plate extraction column of 0.076 m diameter. Geometrical parameters like perforation diameter, plate spacing and fractional free area (FFA) of sieve plate and operating parameters, such as pulse velocity and superficial velocities of dispersed and continuous phase, were studied using kerosenewater system. The drop size was reduced with decrease in perforation diameter, plate spacing, FFA and pulse velocity. Dispersed phase hold-up was found to be a function of drop size and superficial velocity of dispersed phase. At pulse velocity of 0.025m/s the parabolic behaviour with maxima at the transition from mixer-settler to dispersion regime of flooding curve has been noticed for all the different geometrical conditions. The maximum mass transfer interface together with utmost throughput was obtained at perforation diameter of 0.003 m, plate spacing of 0.05m and FFA of 0.2. The optimal operating parameters were pulse velocity of 0.025 m/s and superficial velocity of 0.006 m/s using organic to aqueous ratio (O/A) of 1:1. The drop size attained at these conditions was 0.0015 m with dispersed phase hold-up of 18%. The correlations developed can be used for the prediction of hold-up and drop size.

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Section: Effect Of Pulse Velocity On Flooding Curvementioning

confidence: 69%

Hydrodynamics of a Pulsed Sieve Plate Extraction Column

Somkuwar

Kolhe

Rathod

2014

Indian Chemical Engineer

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“…Brzina dispergovane faze kroz otvor na podu, na kojem dispergovana i kontinualna faza dolaze u kontakt, može se dosta precizno proračunati. Kumar i Hartland [13] su razvili dve poboljšane korelacije koje su dale dobro slaganje računskih i eksperimentalnih podataka za srednji prečnik kapi, uzimajući u obzir eksperimentalne podatke za više dvofaznih sistema iz nekoliko literaturnih izvora, pri čemu je korišćena ekstrakciona kolona sa raspršivanjem. Slaganje računskih i eksperimentalnih rezultata za srednji prečnik kapi, izraženo kao srednje apsolutno relativno odstupanje (SARO), iznosilo je od 9,7 %.…”

Section: Brzina Plavljenja I Srednji Prečnik Kapiunclassified

“…Ova veličina se može redukovati na 7,3 % ako se koriste dva regiona za vrednost brzine dispergovane faze razdvojena kritičnim prečnikom kapi. Navedene korelacije se mogu izraziti na sledeći način [13]:…”

Section: Brzina Plavljenja I Srednji Prečnik Kapiunclassified

Hydrodynamics of pulsed sieve-plate extraction columns

Sovilj

Spasojević

2020

Hem Ind

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Izvod U ovom radu se prikazuje pregled istraživanja vezanih za hidrodinamiku pulzacionih ekstrakcionih kolona sa perforiranim podovima (PEPP kolone). Analizirane su eksperimentalne vrednosti nekih hidrodinamičkih parametara, preuzete iz literature, kao što su srednji prečnik kapi, brzina plavljenja, sadržaj dispergovane faze, relativna brzina, kao i koeficijent aksijalne disperzije u sistemima tečno-tečno u ovim ekstrakcionim kolonama. Ovi parametri su značajni pri određivanju hidrodinamike i prenosa mase u ekstrakcionim kolonama , koji su važni u postupku razvoja i poboljšanja strategija u projektovanju pulzacionih ekstrakcionh kolona sa perforiranim podovima kada se pri ekstrakciji uvode novi sistemi tečno-tečno. Poznavanje raspodele i veličine prečnika kapi dispergovane faze su neophodni parametri pri određivanju koeficijenta prenosa mase u ekstrakcionoj koloni, kao i pri merenju efikasnosti same kolone. U ovom radu dat je i pregled istraživanja koja se odnose na uticaj geometrijskih i operativnih parametara kolonskog ekstraktora na osnovne hidrodinamičke karakteristike ekstrakcione kolone. U eksperimentalnim merenjima u literaturi su uočena tri radna režima u pulzacionim ekstrakcionim kolonama, definisana kao: režim mešača-odvajača, disperzioni režim i emulzioni režim.. U radu je analizirana i primena nekih od najznačajnih empirijskih korelacija za određivanje hidrodinamičkih parametara PEPP kolona. Ključne reči: srednji prečnik kapi, brzina plavljenja, sadržaj dispergovane i kontinualne faze, koeficijent aksijalne disperzije, relativna brzina.

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“…Some of the correlations that have been used to predict the mass transfer coefficient are listed in Table S1. [5,6,12,14,[26][27][28][29][30][31][32] There are many approaches to deal with mass transfer and axial mixing in liquid-liquid extraction columns, such as the plug flow model (PFM), axial dispersion model (ADM), drop population balance model (DPBM), and forward mixing model (FMM). The plug flow model is based on the ideal assumption of each phase moving exactly in plug flow, which has the same residence time distribution for all elements.…”

Section: Introductionmentioning

confidence: 99%

Use of axial dispersion and plug flow models for determination of axial mixing and mass transfer coefficient in an l‐shaped pulsed packed extraction column

et al. 2019

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In this study, the volumetric overall mass transfer and phases axial mixing coefficients have been investigated in a pilot plant of an L‐shaped pulsed packed extraction column by using two liquid systems of toluene/acetone/water and n‐butyl/acetone/water. The mass transfer performance has been evaluated using two methods of axial dispersion and a plug flow model. The effect of the operational variables and physical properties, including the dispersed and continuous phases flow rates, pulsation intensity, and interfacial tension, on mass transfer and phases axial mixing coefficients have been considered. It has been found that the pulsation intensity and the continuous phase flow rate seriously affect the mass transfer coefficient, however, the dispersed phase flow rate has a weaker effect. Also, the axial mixing of a phase is strongly affected by the pulsation intensity and the flow rate of the phase itself and it is not affected by the second phase flow rate. Finally, new correlations are proposed to accurately predict the mass transfer and axial mixing coefficients.

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Flooding Characteristics And Separation Efficiencies of Pulsed Sieve-Plate Extraction Columns

Cited by 37 publications

References 3 publications

Hydrodynamics of a Pulsed Sieve Plate Extraction Column

Hydrodynamics of a Pulsed Sieve Plate Extraction Column

Hydrodynamics of pulsed sieve-plate extraction columns

Use of axial dispersion and plug flow models for determination of axial mixing and mass transfer coefficient in an l‐shaped pulsed packed extraction column

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