Abstract
This paper presents a review of some hydrodynamic parameters in pulsed sieve-plate extraction columns. The hydrodynamic parameters in liquid-liquid systems in these columns were analyzed regarding the effects of operating and geometrical parameters. The values of Sauter mean drop diameter were function of the existing work flow regimes in the column device defined as mixer-settler, emulsion and dispersion regimes. It was concluded that the dispersed-phase holdup was a function of the mean drop diameter and dispersed-phase superficial velocity. An increase in the dispersed-phase holdup induced an increase in the interface area in the liquid-liquid system. Knowledge of the value of the dispersed-phase holdup can be used for calculation of the volumetric mass transfer coefficient, one of the important factor in the design of the column extractor. It was concluded that the increase in the dispersed-phase superficial velocity is causing a decrease in axial dispersion. On the other hand, an increase in the continuous-phase superficial velocity is causing the increase in the axial dispersion coefficient. Some of the empirical equations proposed in literature for calculations of the hydrodynamic parameters were presented. These correlations, derived for determination of the hydrodynamic parameters in pulsed sieve-plate extraction columns, can be used for the design of these liquid-liquid extraction columns.
Highlights
This paper presents a review of some hydrodynamic parameters in pulsed sieveplate extraction columns
The hydrodynamic parameters in liquid-liquid systems in these columns were analyzed regarding the effects of operating and geometrical parameters
It was concluded that the dispersed-phase holdup was a function of the mean drop diameter and dispersed-phase superficial velocity
Summary
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. 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. Ključne reči: srednji prečnik kapi, brzina plavljenja, sadržaj dispergovane i kontinualne faze, koeficijent aksijalne disperzije, relativna brzina. Od hidrodinamičkih parametara upoređivani su podaci za srednji prečnik kapi dispergovane faze(d), sadržaj dispergovane faze ( d), podaci za brzinu plavljenja, relativnu brzinu, kao i koeficijent aksijalne disperzije (Ec) koji zavise od radnih parametara i geometrije ekstrakcione kolone. Brzina plavljenja se obično računa iz empirijskih korelacija, što je prikazano u radu [9] na primeru rada pulzacione ekstrakcione kolone sa punjenjem. Koncept karakteristične brzine je uveden u radu [12] za ekstrakcione kolone sa punjenjem, a predstavljen je sledećom jednačinom: Us
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