Joint mass transfer of two components associated with the spontaneous interfacial convection in the liquid-liquid extraction system

Shevchenko, E. A.; Mitra, Shirsendu; Ермаков, С. А.; Титов, А. Г.; Ermakov, A. A.; Pattader, Partho Sarathi Gooh

doi:10.1016/j.ces.2018.09.018

Cited by 12 publications

(3 citation statements)

References 47 publications

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“…Another scenario results with a slower dissipation of energy, in which periodic roll cell like flow patterns are formed below and above the interface 14. . Sherwood and Wei 4 as well as Gooh Pattader et al 30,31 have provided further exposition of the roles of such interfacial instabilities in various mass transfer processes, which have immense implication in liquid-liquid extraction technologies.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Emulsification: Elucidation of the Local Processes

Kullappan

Patel

Chaudhury

2023

Preprint

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Micro and/or Nano sized emulsions are formed when an organic liquid gently comes in contact with water in the presence of a surfactant, where no external agitation is required. Many years of research made it clear that the driving force for spontaneous emulsification arises from the differences of the chemical potentials of various components in the organic and aqueous phases, which triggers diffusion coupled hydrodynamic fluctuation. While extraordinary theoretical developments have taken place that attempted to describe these processes within the scopes of equilibrium and non-equilibrium thermodynamics, the local processes underlying the spontaneous emulsification, however, still remain elusive. In this research, we investigate the local processes that involve the transfer of surfactant as well as water from one phase to another (i.e. water to oil), which results in the formation of water-in-oil emulsion in the organic phase and, subsequently. Thes emulsions invert into oil-in-water emulsion, rather abruptly, as they cross the phase boundary. Studies based on UV spectroscopy and molecular dynamics indicate that these processes may involve explosive events and subsequent assembly of the fragments to other organized structures which are reminiscent of cusp catastrophe proposed earlier by Dickinson. These processes lead to either to a strong or a weak fluctuation of the component concentrations below the interface that also becomes evident in the fast (athermal) diffusion of the emulsion droplets from the interfacial region farther into the bulk water. These events can be arrested suitably with polymeric additives.

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Section: Introductionmentioning

confidence: 99%

Spontaneous Emulsification: Elucidation of the Local Processes

Kullappan

Patel

Chaudhury

2023

Preprint

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“…Laterly, these facts have beenere studied by a number of researchers [6,7]. It has turned out that the mass transfer coefficient can change several times at certain values of the driving force [8].…”

Section: Introductionmentioning

confidence: 99%

Drop motion during mass transfer accompanied by interphase convection

et al. 2022

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The article deals with the experimental study of the mass transfer of acetic acid from the dispersed phase (butyl acetate) to the continuous phase (water). The experiments were carried out on a laboratory column with single floating drops. The presence of the Marangoni effect during the movement of drops and its influence on the trajectories of movement of drops and the kinetics of mass transfer during extraction are shown. The influence of the Marangoni effect is most clearly observed when the driving force of the process is 0.1...0.2 mol/l.

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“…In the recent decade, there appeared works dedicated to the methods of the separation of elements which used nonstationary processes based on the differences in the kinetics of chemical reactions. Now [14] is studying the mechanism of the kinetics of the interphase transfer in extraction processes. In [15], high efficiency of a nonstationary process for the separation of rare earth metals is shown and compared with it under the equilibrium conditions.…”

Section: Introductionmentioning

confidence: 99%

Nonstationary separation of Nd and Pr by P507 extractant

Dorozhko

Afonin

2021

E3S Web Conf.

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The low efficiency of the separation of rare earth metals by extraction on one stage requires the combination of a large number of mixer-settlers in a cascade. The problem of increasing the rare earth elements separation factor is extremely urgent. One of the perspective methods is the nonequilibrium nonstationary process. In this work, it is offered to use the principle of a nonstationary extraction in the separation process of the Nd/Pr pair from chloride medium by the extractant based onP507. The results which have been received by an experimental setup allowing the monitoring of the influence of a cyclic change of physical-chemical parameters on extraction in the online modeare discussed. A comparison of two ways of implementation of extraction in the nonstationary mode is carried out. The apparent values of physical-chemical parameters (ΔG, ΔH, ΔS) in the temperatures range 15-65 °C are calculated from the data of joint extraction of Nd and Pr.

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Joint mass transfer of two components associated with the spontaneous interfacial convection in the liquid-liquid extraction system

Cited by 12 publications

References 47 publications

Spontaneous Emulsification: Elucidation of the Local Processes

Spontaneous Emulsification: Elucidation of the Local Processes

Drop motion during mass transfer accompanied by interphase convection

Nonstationary separation of Nd and Pr by P507 extractant

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