The mechanism of distribution of liquids in a plate extractor

Galkin, N.P.; Tikhomirov, V. B.; Goriainov, N.E.; Fedorov, V. D.

doi:10.1016/0368-3230(61)90104-5

Cited by 8 publications

(4 citation statements)

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“…Galkin et al31 found that the efficiency of conventional extraction columns with sieve plates were inadequate. The extraction efficiency was nearly three times of that of conventional columns when air was introduced into the column at the lower end.…”

Section: Introductionmentioning

confidence: 99%

Intensification of liquid–liquid two‐phase mass transfer by gas agitation in a microchannel

et al. 2009

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In this experiment, the inert gas is used to agitate two immiscible fluids in microchannels. The mass transfer performances with or without gas agitation are investigated. 30% TBP (in kerosene)-acetic acid-water is chosen as testing system, and nitrogen as agitating gas. The superficial velocities of the immiscible liquid-liquid two phases and gas phase are varied in the range from 0.02 to 1.2 m/s, and 0 to 3.0 m/s, respectively. In microchannels, with enough gas agitating intensity, high dispersion between two immiscible liquid phases can be obtained. The overall volumetric mean mass transfer coefficients are two-folds higher than those without gas agitating, which are in the range of 3.8-30.6 s À1. Some parameters which impact on the mass transfer process, such as the mixture superficial velocity of the immiscible liquid-liquid two phases, the gas superficial velocity, the microchannel structure, the gas inlet locations and the sampling time are experimentally investigated. V

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Section: Introductionmentioning

confidence: 99%

Intensification of liquid–liquid two‐phase mass transfer by gas agitation in a microchannel

et al. 2009

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“…In the G-L-L system, the continuous phase holdup ( ct ) is defined by: [7] where:  dt -dispersed phase holdup in the G-L-L system,  g -gas phase holdup. On the other hand, the basic eq.…”

Section: Dispersed Phase Holdup and Slip Velocitymentioning

confidence: 99%

Hydrodynamics of gas-agitated liquid-liquid extraction columns

Sovilj

2012

ACTA PERIOD TECHN

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Although the non-agitated extraction columns (spray column, packed column, perforated plate column, sieve plate column, etc) can handle high flow rates and are simple and cheap, there have been relatively few applications of these columns because they suffer from serious backmixing of the continuous phase. It was shown that the backmixing is reduced when the spray column is operated with dense packing of drops. Another way of increasing the efficiency of a non-agitated extraction column is to introduce an inert gas (air, nitrogen, oxygen) as a mixing agent in the two-phase liquid-liquid (L-L) system. This method of energy introduction increases the turbulence within the new three-phase gas-liquid-liquid (G-L-L) system, which causes an improved dispersion of droplets, and, consequently, a higher dispersed phase holdup and therefore a great mass transfer area. The present study reports the hydrodynamics in the non-agitated extraction columns, as well as the axial dispersion for the two- and three-phase systems

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“…For improving the extraction efficiency and extraction rate, the gas-agitated gas-liquid-liquid extraction processes have received considerable attention. Galkin et al [1] found that the efficiency of conventional extraction columns with sieve plates were inadequate. The extraction efficiency was found to be nearly three times that of conventional columns when air was introduced into the column at the lower end and claimed that the process is more efficient than by the use of stirring or pulsation of the column.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Simulation of a Gas‐agitated Sieve Plate Column

Wang

et al. 2004

Chem Eng & Technol

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The extraction of hydrogen peroxide by means of deionized water from anthraquinone working solution via anthraquinone process was carried out in a gas-agitated sieve plate extraction column. The effects of the superficial velocity of air, dispersed phase and continuous phase on the overall plate extraction efficiency have been investigated. The corrections for the prediction of the overall plate extraction efficiency were presented. The correction proposed to predict the overall plate extraction efficiency in the air, water, anthraquinone working solution three-phase system agreed satisfactory with experimental data with a maximum absolute deviation of 5.6 %. A new design method for gas-liquid-liquid three-phase extractors is developed based on the multistage countercurrent extraction model. The calculated data by the model agreed well with experimental data and the average relative deviation was less than 10 %. Moreover, the model was used to predict a gas-agitated sieve plate extraction column for industrial production of hydrogen peroxide. The results show that the plate numbers of gas-agitated sieve plate extraction column are 30±40 % less than that of liquid-liquid sieve plate column.

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The mechanism of distribution of liquids in a plate extractor

Cited by 8 publications

References 0 publications

Intensification of liquid–liquid two‐phase mass transfer by gas agitation in a microchannel

Intensification of liquid–liquid two‐phase mass transfer by gas agitation in a microchannel

Hydrodynamics of gas-agitated liquid-liquid extraction columns

Experimental Investigation and Simulation of a Gas‐agitated Sieve Plate Column

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