Drop formation mass transfer coefficients in extraction columns

Hashem, Mahmoud; El-Bassuoni, Abdel-Monem A.

doi:10.1134/s0040579507050089

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…Wegener et al (2010) presented a correlation to describe the rising velocity of toluene drops in water with different drop diameters and different nozzle materials based on Grace (1976) semiempirical theory. Hashem and El-Bassuoni (2007) also investigated the influence of various parameters such as the formation time, needle size, and flow rates of the continuous and dispersed phase on the mass transfer rate for an acetic acid/toluene/water system. Wegener et al (2007) conducted an experimental study to investigate the rising velocity of drops and mass transfer in a single drop system containing toluene/ acetone/water.…”

Section: Introductionmentioning

confidence: 99%

Separation of Sulfur-Containing Compounds From Diesel by Oxidation Followed by Solvent Extraction in a Single Drop Column

Dana

Sobati

Shahhosseini

et al. 2019

Braz. J. Chem. Eng.

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Oxidative desulfurization (ODS) is an attractive complementary or alternative process for the hydrodesulfurization (HDS) process due to advantages such as mild operating conditions. In the ODS process, the sulfur-containing compounds are oxidized first to polar sulfoxide and sulfone products and then these polar compounds are separated using solvent extraction or an adsorption process. In the present study, the separation of oxidized sulfur-containing compounds of diesel as a real fuel has been investigated using extraction in a single drop column. The oxidation system was hydrogen peroxide/formic acid. The selected solvent for the extraction of oxidized sulfur-containing compounds was dimethylformamide (DMF). In single drop tests, the effect of various parameters including the drop size (1.70-4.60 mm) and column height (228-550 mm) on the different parameters such as drop velocity and sulfur concentration in the dispersed and continuous phases has been investigated. The outcome of this study provides valuable insights for designing the extraction column for separation of oxidized sulfur-containing compounds from middle distillate fuels in an ODS process.

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Section: Introductionmentioning

confidence: 99%

Separation of Sulfur-Containing Compounds From Diesel by Oxidation Followed by Solvent Extraction in a Single Drop Column

Dana

Sobati

Shahhosseini

et al. 2019

Braz. J. Chem. Eng.

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“…It is possible to determine the values of these corrections when experimentally defin ing the characteristic times in which a given form of a drop is during movement, as well as time intervals between the periods of steady existence of specific configurations, i.e., transitions from one shape to another. At the same time, it is rational to carry out experiments with several of the most typical liquids that are widely used in various applications, e.g., water, kerosene, and ethyl alcohol [22][23][24][25][26][27][28][29][30][31][32]. The defi nition of characteristic times for which drops of the allocated liquids exist in the most probable forms according to the data [5][6][7][8] (sphere and ellipse) during their movement through a typical gas environment (air) with significantly subsonic speeds (for perfor mance of terms of moderate Weber numbers [5][6][7][8]) is of interest.…”

Section: Introductionmentioning

confidence: 99%

Experimental estimation of characteristic times of the existence of liquid drops in the form of a sphere and ellipse upon their movement in a gas environment under the conditions of moderate weber numbers

Волков

Кузнецов

2015

Theor Found Chem Eng

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The experimental procedure has been developed and studies using high speed (10 5 frames per sec ond) system of cross correlation video registration of a change in the shape of drops for the most typical liq uids that are widely used in various chemical technologies (water, kerosene, and ethyl alcohol) have been car ried out. The liquids move with significantly subsonic speeds (up to 5 m/s) in the air environment under the influence of gravitational forces. The initial sizes of drops varied in the range of 3-6 mm. The cyclic nature of the changes in the shapes of drops during movement has been established. Characteristic times of transi tions from one shape of drop to another have been measured. Characteristic times of the existence of drops in the form of spheres and ellipses have been defined. Recommendations about the use of geometrical models of liquid drops for theoretical study of heat and mass transfer and hydrodynamics in the course of their move ment through gas environments under the conditions of moderate Weber numbers have been formulated.

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“…Many theoretical, experimental, and numerical investigations have been carried out to gain good understanding of mass‐transfer process occurring to and from a moving single droplet. Skelland and Wellek experimentally studied the mass‐transfer process for solute, moving into falling oscillating and nonoscillating droplets, considering the resistance to mass transfer to lie in dispersed phase.…”

Section: Introductionmentioning

confidence: 99%

Influence of unsteady mass transfer on dynamics of rising and sinking droplet in water: Experimental and CFD study

et al. 2014

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Experimental and numerical investigations were conducted to study the effect of unsteady mass transfer on the dynamics of an organic droplet released in quiescent water. The situation is important and relevant to deep sea oil spill scenario. The droplet contains two components, one is heavier (immiscible) than water and other is lighter (miscible). When released, with an initial mixture density (890-975 kg/m 3 ) lower than that of surrounding water, droplet rises in the column. The mass transfer of lighter solute component into water causes the droplet density to increase and droplet sinks when the density exceeds that of water. A mass transfer correlation accounting for the loss of the solute, based on Reynolds, Grashoff and Schmidt numbers was developed. A 2D axisymmetric CFD model accounting for species transport was developed to emulate the experimental observations. The study also helped in identifying dominant mass transfer mechanisms during different stages of droplet motion.

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Drop formation mass transfer coefficients in extraction columns

Cited by 7 publications

References 12 publications

Separation of Sulfur-Containing Compounds From Diesel by Oxidation Followed by Solvent Extraction in a Single Drop Column

Separation of Sulfur-Containing Compounds From Diesel by Oxidation Followed by Solvent Extraction in a Single Drop Column

Experimental estimation of characteristic times of the existence of liquid drops in the form of a sphere and ellipse upon their movement in a gas environment under the conditions of moderate weber numbers

Influence of unsteady mass transfer on dynamics of rising and sinking droplet in water: Experimental and CFD study

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