Rotating reverse osmosis and spiral wound reverse osmosis filtration: A comparison

Shah, Tapan N.; Yoon, Yeomin; Pederson, Cynthia L.; Lueptow, Richard M.

doi:10.1016/j.memsci.2006.09.004

Cited by 12 publications

(3 citation statements)

References 16 publications

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“…(1) and (2). Ion concentration at the membrane will rise due to increased concentration polarization, more rapidly than the VRR, and ion transmission to permeate side will increase, reducing conductivity rejection [8,14,15].…”

Section: Variation Of Permeate Flux Conductivity and Conductivity Rementioning

confidence: 99%

Reverse osmosis of diluted skim milk: Comparison of results obtained from vibratory and rotating disk modules

Frappart

Jaffrin

Ding

2008

Separation and Purification Technology

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Section: Variation Of Permeate Flux Conductivity and Conductivity Rementioning

confidence: 99%

Reverse osmosis of diluted skim milk: Comparison of results obtained from vibratory and rotating disk modules

Frappart

Jaffrin

Ding

2008

Separation and Purification Technology

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“…8 Rotating filtration is used commercially for extracting plasma from whole blood, [9][10][11] and it has been proposed as a method for other filtration systems [12][13][14][15][16][17][18][19][20][21][22][23] as well as for reverse osmosis to purify water. [24][25][26] A rotating filter consists typically of a cylindrical porous inner cylinder rotating within a concentric nonporous stationary outer cylinder. A suspension enters the system at one end and travels axially in the annulus between the two cylinders.…”

Section: Introductionmentioning

confidence: 99%

Stability of Taylor–Couette flow in a finite-length cavity with radial throughflow

2008

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Linear stability analysis predicts that a radial throughflow in a Taylor-Couette system will alter the stability of the flow, but the underlying physics for the stabilization of the flow is unclear. We investigate the impact of radial inflow and outflow on Taylor vortex flow and wavy vortex flow in a finite-length cavity via direct numerical simulation using a three-dimensional spectral method. The numerical simulations are consistent with linear stability predictions in that radial inflow and strong radial outflow have a stabilizing effect, while weak radial outflow destabilizes the system slightly. A small radial outflow velocity enhances the strength of the Taylor vortices resulting in destabilization of the base flow, whereas strong radial outflow and radial inflow reduce vortex strength, thus stabilizing the system. The transition to wavy vortex flow is unaffected by small radial outflow, but is stabilized for radial inflow. For strong radial outflow the wavy vortex flow includes localized dislocations in the vortex structure.

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“…45 Gas was pressurized outside the membrane and, depending on its pressure with respect to the liquid, diffusion or bubbling could be achieved. Other works report the use of a membrane as a rotor in a Taylor-vortex device for various applications such as blood component separation, [46][47][48][49][50] reverse osmosis, [51][52][53][54] and filtration of emulsions, 55,56 suspensions [57][58][59][60] and proteins. 61 In all these studies, the high-speed rotating filter membrane created an intense shear rate, which, together with the effect from the Taylor vortices, reduced concentration polarization and increased filtration rate.…”

Section: Introductionmentioning

confidence: 99%

Taylor‐vortex membrane reactor for continuous gas‐liquid reactions

2022

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A unique Taylor-vortex membrane reactor (TVMR) design for continuous gas-liquid reactions is presented in this work. The reactor consists of a cylindrical rotor inside a stationary concentric cylindrical vessel, and a flexible system of equispaced baffle rings surrounding the rotor. This restricts the annular cross section to a small gap between the baffles and the rotor, and divides the annulus into 18 mixing zones.The baffles support a 6 m long PFA tubular membrane that is woven around the rotor. At 4 mL/min inlet flow rate, the TVMR showed a plug-flow behavior and outperformed the unbaffled reactor, having 5-12 times lower axial dispersion. The continuous aerobic oxidation of benzyl alcohol was performed for 7 h using the Pd(OAc) 2 /pyridine catalyst in toluene at 100 C and 1.1 MPa oxygen pressure.A stable conversion of 30% was achieved with 85% benzaldehyde selectivity, and no pervaporation of organics into the gas phase.

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Rotating reverse osmosis and spiral wound reverse osmosis filtration: A comparison

Cited by 12 publications

References 16 publications

Reverse osmosis of diluted skim milk: Comparison of results obtained from vibratory and rotating disk modules

Reverse osmosis of diluted skim milk: Comparison of results obtained from vibratory and rotating disk modules

Stability of Taylor–Couette flow in a finite-length cavity with radial throughflow

Taylor‐vortex membrane reactor for continuous gas‐liquid reactions

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