Absorption of CO with reaction in a biphasic medium (aqueous NaOH-n-hexane): rate enhancement due to dispersed organic phase and phase-transfer catalysis

Chaudhari, Raghunath V.; Jayasree, Pyla; Gupte, Sunil P.; Delmas, Henri

doi:10.1016/s0009-2509(97)88934-8

Cited by 9 publications

(5 citation statements)

References 13 publications

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“…Generally, the second liquid was dispersed into continuous phase to form emulsion system, by which enhancement of mass transfer is realized in gas-liquid. Some research [15][16][17][18] has reported and discussed in the following areas: absorption with and without chemical reaction, mass transfer in biological systems and catalytic systems. The effect of dispersed droplets on the mass transfer coefficient and the interfacial area is very complex.…”

Section: Introductionmentioning

confidence: 99%

Improving Mass Transfer in Gas-Liquid by Ionic Liquids Dispersion

Liu

Zhang

et al. 2012

Journal of Dispersion Science and Technology

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This study investigates effects of dispersed ionic liquids on chemical absorption of CO 2 in alkanolamine aqueous solution. Oil-in-water emulsion has been prepared, whose continuous phase is trethanol amine aqueous solution, and dispersed phase is an ionic liquid, 1-octyl-3methyl imidazole six phosphate fluoride. The morphololgy of dispersion has been observed by visual method. Absorption rates are linearly fitted based on experimental data. Results show that a mass transfer enhancement has been realized by ionic liquids dispersion. The collaborative action of hydrodynamic effect and shuttle effect is proved to be the main mechanism that ionic liquids dispersion enhances gas absorption. The research indicates that dispersed ionic liquids can bring some advantages, higher absorption rate, lower corrosion for equipment, and higher regeneration efficiencies.

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Section: Introductionmentioning

confidence: 99%

Improving Mass Transfer in Gas-Liquid by Ionic Liquids Dispersion

Liu

Zhang

et al. 2012

Journal of Dispersion Science and Technology

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“…Mass transport into fine solid particles − or liquid drops − can essentially alter the concentration gradient in the liquid boundary layer at the gas−liquid interface and, consequently, the absorption rate . For example, the oxygen absorption rate has been increased by a factor up to about 4 (in the dispersion of octene droplets, H = 18, D r = 0.56, ε = 0.05−0.5), by a factor up to 1.4 (in the presence of hexadecane dispersion, H = 11.6, D r = 1, ε = 0.01−0.08), and by a factor of 4.5 (in the presence of n -dodecane, H = 7.9, D r = 1, ε = 0.05−0.25) in agitated vessels.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of an organic phase can alter both the mass-transfer coefficient and the interfacial area . To describe the mass-transfer rate theoretically, both effects have to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Three-Phase Mass Transfer: Effect of the Size Distribution

Nagy¹,

Hadik²

2003

Ind. Eng. Chem. Res.

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The absorption of oxygen into the aqueous phase was measured in the presence of a dispersed silicone oil phase. In the most experiments, a thin, permeable membrane layer resulting from interface polymerization encapsulated the organic droplets. The size distribution and average droplet size, obtained at different stirrer speeds, were measured. Using a heterogeneous, multilayer mass-transfer model, enhancement was predicted as a function of mass-transfer coefficient without particles and average particle size. Enhancements measured and predicted were compared to each other as a function of the dispersed-phase hold-up and the average particle size. It was concluded that the particle size distribution can significantly alter the absorption rate; thus, its effect should take into consideration in the prediction of absorption rate enhancement.

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“…The effect was somewhat stronger at higher stirring rates. Chaudhari et al (1997) found an increasing absorption rate for CO absorption in NaOH solutions on addition of hexane as dispersed phase.…”

Section: 1mentioning

confidence: 93%

Mass transfer and chemical reaction in gas-liquid-liquid systems

Brilman

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Absorption of CO with reaction in a biphasic medium (aqueous NaOH-n-hexane): rate enhancement due to dispersed organic phase and phase-transfer catalysis

Cited by 9 publications

References 13 publications

Improving Mass Transfer in Gas-Liquid by Ionic Liquids Dispersion

Improving Mass Transfer in Gas-Liquid by Ionic Liquids Dispersion

Three-Phase Mass Transfer: Effect of the Size Distribution

Mass transfer and chemical reaction in gas-liquid-liquid systems

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