Axial Mixing in Emulsion-flow Column under Iodine Extraction

Hirayama, Mikiro; Goshima, Takashi; Mizuta, Kei; Nii, Susumu

doi:10.15261/serdj.28.11

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Therefore, iodine transferred only in the organic phase. Since Hirayama et al [11] reported that the degree of axial mixing in the emulsion-flow column was comparable to that in packed column extractors, an assumption of counter-current plug flow regime was made for the flow condition of two phases. On the plug flow condition, iodine mass-transfer capacity coefficient, k o a, was determined by the following equation.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Flow Characteristics and Mass-Transfer in Droplet Layer Formed in an Emulsion-Flow Column by Using Extraction of Iodine from Organic Phase

AKAHOSHI,

HIRAYAMA,

ZHANG

et al. 2023

SERDJ

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The novel extraction method called "emulsion-flow" is characterized by using a layer of accumulated droplets in the column to supply both phases in the form of droplets. To clarify the flow behavior of both phases in the layer, extraction of iodine from organic to aqueous phase was carried out to enhance visibility of organic phase with the help of iodine. In addition, the mass-transfer in the organic phase was examined by extracting iodine from organic phase to aqueous Na 2 S 2 O 3 solution. The results indicated that two phases in the droplet layer were in the state of O/W/O emulsion where most of the water flows down in the form of film around the droplets. Also, progress of coalescence of organic-phase droplets during extraction of iodine from organic phase was observed. The height of droplet layer increased with the square of organicphase flow velocity. The trend was the same as that observed for extraction of iodine from the aqueous phase. The mass-transfer capacity coefficient of the organic phase increased linearly with the organic-phase flow velocity, with a small dependence on the aqueous-phase flow velocity. The trend of the distribution of iodine concentration in the column was predicted by solving the convection-diffusion equation with an appropriate setting of the Peclet number.

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Section: Theoretical Backgroundmentioning

confidence: 99%

“…Figure 9 shows a comparison between calculated values equations (7 and 8) and observed iodine concentration, x A . In calculation, Pe was set at 4 in accordance with the report by Hirayama et al [11].…”

Section: Iodine Concentration Distribution Along Column Heightmentioning

confidence: 99%

Flow Characteristics and Mass-Transfer in Droplet Layer Formed in an Emulsion-Flow Column by Using Extraction of Iodine from Organic Phase

AKAHOSHI,

HIRAYAMA,

ZHANG

et al. 2023

SERDJ

Self Cite

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Evaluation of Mass-transfer Performance of Emulsion-flow Column with Height of Transfer Unit (HTU) and Number of Theoretical Plates, and Comparison of HTU with Column-type Extractors

et al. 2020

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The performance of iodine extraction in the emulsion-flow column was evaluated using an indicator of difficulty in separation, height of transfer unit, HTU and of the number of theoretical plates, Nth. Resulting HTU values ranged from 0.15 to 0.78 m and Nth changed from 0.58 to 1.3. HTU values were formulated in accordance with operating liquid velocities. Despite a 30% margin of error, HTU values were found to be useful in predicting column performance. Observed HTU values were compared with those of conventional extraction columns with or without mechanical agitation. The emulsion-flow column meets the top-level performance of extractors without mechanical agitation, such as packed and spray columns, and performs in the middle range of agitated extractors, although these sacrifice the structure simplicity to assure stable counter-current operation. The advantage of the emulsion-flow column is better HTU values with stable counter-current operation in a simple column structure.

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Axial Mixing in Emulsion-flow Column under Iodine Extraction

Cited by 2 publications

References 23 publications

Flow Characteristics and Mass-Transfer in Droplet Layer Formed in an Emulsion-Flow Column by Using Extraction of Iodine from Organic Phase

Flow Characteristics and Mass-Transfer in Droplet Layer Formed in an Emulsion-Flow Column by Using Extraction of Iodine from Organic Phase

Evaluation of Mass-transfer Performance of Emulsion-flow Column with Height of Transfer Unit (HTU) and Number of Theoretical Plates, and Comparison of HTU with Column-type Extractors

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