Critical displacement pressure of a supported liquid membrane

Zha, Fengchao; Fane, Anthony G.; Fell, C.J.D.; Schofield, R.W.

doi:10.1016/0376-7388(92)80007-7

Cited by 69 publications

(57 citation statements)

References 10 publications

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“…Zha et al [16] have introduced that if the geometry of the pore is axially irregular, a structure angle, α, may be defined. Figure 2.…”

Section: Theoretical Description Of Liquid Entry Pressurementioning

confidence: 99%

Theoretical and Experimental Approaches of Liquid Entry Pressure Determination in Membrane Distillation Processes

Rácz¹,

Kerker²,

Kovács³

et al. 2014

Period. Polytech. Chem. Eng.

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Membrane distillation (MD) is a thermally driven separation process that employs a hydrophobic membrane as a barrier for IntroductionMembrane distillation (MD) is a thermally driven separation technique using microporous hydrophobic membranes and performing on the principles of vapor-liquid equilibrium under different configurations. In this process, only volatile compounds (mainly water) of the feed stream evaporate at the membrane pore entrance, cross the membrane pores in vapor phase to finally be either condensed or removed as a vapor from a membrane module. The hydrophobic nature of the membrane prevents the pores from wetting by capillary forces. MD is known as a promising technology for many applications such as desalting seawater, brackish water, highly saline water [1,2], and removing organic compounds and heavy metals from aqueous solutions [3,4]. MD has also been used to manage waste water such as radioactive waste waters, oily waste waters [5], where the product could be safely discharged to the environment or the waste streams could be reused in an appropriate industrial activity. In biotechnology and food processing applications, MD has also been found as a promising tool, for instance, for removing ethanol and other metabolites from fermentation broths [6], for gentle concentration of valuable compounds in fruit juices [7], and in herb extract such as Ginseng [8].MD has many attractive features as compared to conventional separation processes. Low operating temperatures (~30-70°C) is one of them since the feed is not necessarily heated up to the boiling point like in thermal distillation. Thus, MD may advantageously utilize alternative energy sources, such as solar energy, geothermal energy, waste heats from power plant, etc. [9]. Compared with pressure driven membrane filtration processes such as nanofiltration or reverse osmosis, lower operating pressure translates to lower equipment costs and increased process safety. It is worth highlighting that membrane fouling in MD seems to be less of a problem for many applications than that in pressure-driven filtration processes [10].MD is, however, attended by some drawbacks. Compared to reverse osmosis, MD is known to have a lower permeate flux, and the susceptibility of permeate flux to processing conditions, particularly to temperature and concentration, is considerably high. Also, the trapped air within the membrane pores

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“…Zha et al [16] have introduced that if the geometry of the pore is axially irregular, a structure angle, α, may be defined. Figure 2.…”

Section: Theoretical Description Of Liquid Entry Pressurementioning

confidence: 99%

Theoretical and Experimental Approaches of Liquid Entry Pressure Determination in Membrane Distillation Processes

Rácz¹,

Kerker²,

Kovács³

et al. 2014

Period. Polytech. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…It is frequently assumed that the LEP of a membrane is determined by its largest pore (r max ). However, α plays an important role in the displacement of the liquid and sometimes the LEP does not occur at the narrowest part of the widest pore but at a certain value of α [13].…”

Section: Introductionmentioning

confidence: 98%

“…Both these irregularities affect the apparent CA of the membrane surface and therefore its hydrophobicity. The deviation of any irregular pore structure from a cylindrical capillary one can be described by two parameters [13]: the hydraulic radius (r h ), reflecting the radial deviation from a circle, and a structural angle (α), reflecting the pore's deviation from the vertical axis. α can change along the pore path and an average value for it (α average ) is often adopted.…”

Section: Introductionmentioning

confidence: 99%

Membrane structure and surface morphology impact on the wetting of MD membranes

Guillén-Burrieza

Servi

Lalia³

et al. 2015

Journal of Membrane Science

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“…In addition, in the countercurrent operation of the gas and liquid phases in a hollow fiber module, pressure drop over the fiber length can result in the membrane pores wetting of the initial section in the liquid inlet (higher breakthrough pressure) [21]. Moreover, the nature of liquid such as ionic species, complexes, microorganisms or impurities, can change the wetting characteristics of the membrane-liquid system [67].…”

Section: Wetting Characteristics Of Membrane-absorbent Combinationmentioning

confidence: 99%