Solvent extraction with immobilized interfaces in a microporous hydrophobic membrane

Kiani, Armin; Bhave, Ramesh R.; Sirkar, Kamalesh K.

doi:10.1016/s0376-7388(00)81328-9

Cited by 274 publications

(150 citation statements)

References 4 publications

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“…The order of magnitude indicates that the aqueous mass transfer resistance predominates, i.e., K a ≈k a , which means the rate determining step of the overall mass transfer process is in the lumen side. This situation is similar to that described by Kiani et al(1984) as a "high value of m". Fig.…”

Section: Concentration Profiles In All Sub-regionssupporting

confidence: 86%

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

Kong

Cheng

Wang

et al. 2016

J. Zhejiang Univ. Sci. A

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Non-dispersive solvent extraction (NDSE) with p-xylene as extractant was employed as a novel separation method to recover both p-toluic (PT) acid and water from purified terephthalic acid (PTA) wastewater. The mass transport behavior of PT acid from aqueous solution to p-xylene was investigated by experiments and numerical simulation. Experiments showed that NDSE is feasible and effective. Residual PT acid in the raffinate can be reduced to lower than the permitted limit of wastewater re-use (100 g/m 3 ) with extraction time longer than 60 s in industrial conditions. A mathematical model of PT acid mass transport was developed to optimize the membrane module performance. The model was validated with the experimental results with relative errors of less than 6%. Numerical analysis for mass transfer through the lumen side, the porous membrane layer, and the shell side showed that PT acid transport in the aqueous solution is the rate determining step. The effects of the membrane and operating parameters on membrane module performance were investigated by means of computational simulations. The key parameters suggested for industrial NDSE design are: fiber inner radius r 1 =200-250 μm, extraction time t e =50-60 s, aqueous/ organic volumetric ratio a/o=9.0, and temperature T=318 K.

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Section: Concentration Profiles In All Sub-regionssupporting

confidence: 86%

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

Kong

Cheng

Wang

et al. 2016

J. Zhejiang Univ. Sci. A

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“…As a comparison, the mean pore tortuosity of flat and hollow fiber polyproplylene MF membranes ranges between 1.9 and 2.8 [16,17].…”

Section: Pore Structure Of Spg Membranesmentioning

confidence: 99%

Permeability of hydrophilic and hydrophobic Shirasu-porous-glass (SPG) membranes to pure liquids and its microstructure

Vladisavljević

Shimizu²,

Nakashima

2005

Journal of Membrane Science

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• This is the author's version of a work that was accepted for publication Hydrophobic modification of membrane surface was made by surface coating with silicone resin. The results are discussed using the non-uniform capillary bundle model of membrane permeability. The mean pore tortuosity of 1.28 was kept constant over the whole range of mean pore sizes investigated. The SEM images confirmed that the geometry of pore network was similar for all SPG membranes, irrespective of their mean pore size. The span of pore size distribution ranged from 0.28 to 0.68 and the number of pores per unit cross-sectional -2-membrane area from 10 9 to 10 13 m -2 . The membrane resistance was unchanged after surface treatment with silicone resin, which means that the pores were not plugged by the resin, even in the submicron range of mean pore sizes.

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“…Mass transfer resistances in MAS processes have been studied by many researchers [2][3][4][5][6][7][8][9][10]. The overall liquid phase based mass transfer coefficient (K L ) for MAS is usually lower than that for the conventional air-stripping process due to the mass transfer resistance (1/(k m H)) created by the membrane itself [2,4].…”

Section: Introductionmentioning

confidence: 99%

A study of mass transfer in the membrane air-stripping process using microporous polyproplylene hollow fibers

Mahmud

Kumar

Narbaitz

et al. 2000

Journal of Membrane Science

110

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The mass transfer of water and chloroform in membrane air-stripping (MAS) was studied using a microporous polypropylene hollow fiber membrane module, with air flow on the lumen side and liquid cross-flow on the shell side. Water transport experiments showed that its mass transport decreased significantly when the membrane had been in contact with water for prolonged periods. It was hypothesized that the increased mass transfer resistance was due to water condensation in a fraction of the membrane pores. MAS of chloroform from aqueous solutions confirmed the additional mass transfer resistance with prior exposure to water. It was concluded that membrane pores were either completely air-filled or partially wetted with water during the MAS process. Existing models are able to predict the performance only for either completely air-filled or liquid-filled pores. A modified model was proposed to take into account the diffusion through partially wetted pores. The model described the data well. This hypothesis also provided a plausible explanation to the conflicting literature values of the membrane mass transfer resistance. It was found that the membrane mass transfer resistance of the partially wetted pores is two orders of magnitude higher than that of air-filled pores. The overall mass transfer coefficient was constant for initial feed chloroform concentrations ranging from 50 to 1000 ppm. Crown

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Solvent extraction with immobilized interfaces in a microporous hydrophobic membrane

Cited by 274 publications

References 4 publications

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

Non-dispersive solvent extraction of p-toluic acid from purified terephthalic acid plant wastewater with p-xylene as extractant

Permeability of hydrophilic and hydrophobic Shirasu-porous-glass (SPG) membranes to pure liquids and its microstructure

A study of mass transfer in the membrane air-stripping process using microporous polyproplylene hollow fibers

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