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A triple layer hydrophobic-hydrophilic membrane for membrane distillation applications

A membrane distillation, hydrophobic technology, applied in the field of three-layer composite nanofiber membrane, can solve the problem of not improving the hydrophobicity of the composite membrane, and achieve the effect of low thermal conductivity

Inactive Publication Date: 2014-08-20
NGEE ANN POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a composite membrane is disadvantageous because the hydrophobicity of the composite membrane is limited by the material used to manufacture the membrane, and, the arrangement of the layers does not enhance the hydrophobicity of the composite membrane

Method used

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  • A triple layer hydrophobic-hydrophilic membrane for membrane distillation applications
  • A triple layer hydrophobic-hydrophilic membrane for membrane distillation applications
  • A triple layer hydrophobic-hydrophilic membrane for membrane distillation applications

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Embodiment 1

[0068] For material, 761 grade material PVDF (melting point 165°C to 172°C) was purchased from Arkema Pte. Ltd., Singapore. Technical grade material PVP-K17 was purchased from Shanghai Welltone Material Technology Co., Ltd, Shanghai, China, while analytical grade ethanol, acetone and N,N'-dimethylacetamide (DMAC) were purchased from Sigma, Singapore. The water used was distilled and purified with a Milli-Q plus system from Millipore, Bedford, MA, USA.

[0069] For the microporous layer cast onto the backing layer, the PVDF cast membrane was prepared by immersion precipitation method. Polyvinylidene fluoride polymer in dimethylacetamide (DMAC) can be used as a polymer dopant, and PVP-K17 can be used as an additive, while ethanol can be used as a non-solvent. The compositions of the casting solutions were 17 wt% of PVDF, 5 wt% of PVP, 2 wt% of ethanol and 76 wt% of DMAC. PVDF and PVP powders were added to the DMAC mixture, the ethanol solution was mixed in a RB three-neck fl...

Embodiment 2

[0078] In this embodiment, polydimethylsiloxane (PDMS) is added to the microporous layer 215 . Microporous layer 215 comprises a PVDF-PDMS membrane that can be cast onto a backing layer. These PVDF-PDMS membranes can be prepared by blending and immersion precipitation methods. Polyvinylidene fluoride and poly(dimethylsiloxane) in dimethylacetamide (DMAC) can be used as polymer dopants, and PVP-K17 can be used as an additive while ethanol is used as a non-solvent . The composition of the casting solution contained 17wt% of PVDF, 5wt% of PVP, 2wt% of ethanol, 0wt% to 6wt% of PDMS and 70wt% to 76wt% of DMAC. PVDF and PVP powders were added to the mixed DMAC, PDMS and deionized water solution in a RB three-neck flask, and the solution was mechanically stirred at 80°C for at least 48 hours to ensure complete dissolution of the polymers. The polymer solution was cast by immersion precipitation at room temperature. Then, the PVDF-PDMS dopant solution was cast on a glass plate by ...

Embodiment 3

[0090] In this embodiment, in the Figure 6 In step 620 of the illustrated electrospinning setup, additives are added to liquid polymer 502 . The liquid polymer 502 with additives is then used to produce a nanofiber mat. In one embodiment of the invention, a clay additive is added to the liquid polymer 502 containing PVDF.

[0091] Figure 17 The contact angles of nanofiber mats 1705, 1710, 1715, and 1720 over time are shown. A nanofiber mat 1705 was produced using a liquid polymer containing 12 wt% PVDF, and a nanofiber mat 1710 was produced using a liquid polymer containing 12 wt% PVDF with the addition of 2 wt% clay. Nanofiber mat 1715 was produced using a liquid polymer containing 12 wt% PVDF with 4 wt% clay added, and nanofiber mat 1720 was produced using a liquid polymer containing 12 wt% PVDF with 8 wt% clay added. The figure shows that as the concentration of the clay additive in the liquid polymer 502 increases, the contact angle of the nanofiber mat also increase...

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Abstract

This invention relates to a triple layer composite nanofiber membrane for Membrane Distillation (MD) applications. The triple layer membrane has an extremely hydrophobic nanofiber layer, a hydrophobic microporous middle layer and a hydrophilic backing layer for MD applications.

Description

technical field [0001] The invention relates to a three-layer composite nanofiber membrane. More particularly, the present invention relates to a three-layer composite nanofibrous membrane for membrane distillation (MD) applications. More particularly, the present invention relates to a three-layer membrane for MD applications with an extremely hydrophobic nanofibrous layer, a hydrophobic microporous middle layer and a hydrophilic backing layer. Background technique [0002] Membrane distillation (MD) is a thermally driven process in which only vapor molecules are transported through membrane layers. Thus, a central element in MD is a hydrophobic membrane that is permeable to vapor but impermeable to liquid. The liquid feed for the distillate is on one side of the membrane, while the collection area for the distillate or liquid collected from condensation of the vapor molecules is on the other side of the membrane. The distillate is usually heated, and the distillate is u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/36B01D69/12B32B3/26B32B27/08
CPCB01D67/0004B01D69/12B01D69/02B01D71/34B01D71/36B01D2325/02B01D2325/36B01D2323/39B01D71/56B01D2325/38B32B3/26B01D2319/06B01D69/127B01D71/06B01D61/364B01D71/70B01D67/00042B01D71/701B01D2325/0283
Inventor 古尔德夫·辛格詹姆斯·安东尼·普林斯
Owner NGEE ANN POLYTECHNIC
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