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Filled polymeric membranes, use and method of manufacturing

A technology for filling polymers and fillers, which can be used in separation methods, chemical instruments and methods, membranes, etc., and can solve problems such as selectivity decline.

Inactive Publication Date: 2010-09-01
FLEMISH TECH INST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the disadvantage of increasing the filler content and thus increasing the interstitial void size is the decrease in selectivity

Method used

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  • Filled polymeric membranes, use and method of manufacturing
  • Filled polymeric membranes, use and method of manufacturing
  • Filled polymeric membranes, use and method of manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] 1.002 grams of silica nanoparticles (TS-530) were added to 50 grams of toluene and magnetically stirred for 5 minutes. Aggregates of silica nanoparticles in suspension had an average aggregate size of 110 nm. Thereafter, 1 gram of PTMSP was added and the suspension was magnetically stirred for 4 days until the polymer was completely dissolved into the suspension. Next, the suspension was cast on a glass plate, and the solvent was allowed to evaporate under ambient conditions, leaving a 125 micron thick thin film (ie, membrane) of the filled polymer. After evaporation, the polymer film was removed from the glass plate by soaking in desalinated water. The nanoparticle filler constituted 50 wt% of the membrane.

[0111] The membrane was heated at 80°C for 2 hours and tested for pervaporation of ethanol / water mixtures. A feed of water mixture containing 10 wt% ethanol was circulated on one side of the membrane and a vacuum of 0.2 mbar was maintained on the other side of ...

Embodiment 2

[0113] The PTMSP / silica / toluene suspension of example 1 was diluted to a dry matter content of 3% by weight and cast on a porous polyacrylonitrile (PAN) layer with a cast thickness of 1 mm. After solvent evaporation, a 30 micron film of filled polymer (ie membrane) was formed on the porous PAN layer. The weight fraction of nanoparticle filler in the film is 50 wt%.

[0114]The resulting membranes were heated at 80° C. for 2 hours in order to completely remove the solvent and test the pervaporation of ethanol / water mixtures. A water mixture containing 5 wt% ethanol was circulated on one side of the membrane and a vacuum of 0.2 mbar was maintained on the other side of the membrane. On the other side the permeate was collected as a 40 wt% ethanol / water mixture. The flux through the membrane is 1.25 kg / m 2 Hour.

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Abstract

The present invention is related to a method of manufacturing a filled polymeric membrane comprising a first step of preparing a filler suspension comprising a solvent for a glassy polymer and nanometre-sized particles. The nanometre-sized particles in said filler suspension are aggregated in aggregates having an average aggregate size in the range between 50 nm and smaller than 200 nm. In a following step, the glassy polymer is added to the filler suspension to obtain a polymer suspension. Next, the glassy polymer is dissolved in the polymer suspension. In a next step, the polymer suspensionis cast on a substrate, followed by a step of removing the solvent. A filled polymeric membrane comprising aggregates of nanometre-sized filler particles and uses of the membrane in pervaporation andnanof iltration are also provided.

Description

technical field [0001] The present invention relates to polymer films comprising fillers, their production and their use. The fillers are nano-sized particles. The polymer of the film is a glassy polymer having a glass transition temperature higher than or equal to 100°C. Filled polymer membranes find application in processes for separating mixtures of (fluid) components. An example of the latter is gas and vapor separation. Background technique [0002] De Sitter et al. disclose in "Silica filled poly(l-trimethylsilyl-1-propyne) nanocomposite membranes: relation between the transport of gases and structural characteristics", Journal of Membrane Science vol.278 (2006), pp.83-91 A method of making a filled polymer film. The polymer is poly(1-trimethylsilyl-1-propyne), also known as PTMSP, while silica nanoparticles are used as filler material. The method for making the membrane is a three-step solvent casting process. First, the silica was dispersed in toluene by 30 min...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/14B01D71/36B01D53/22
CPCB01D71/027B01D71/70B01D69/148B01D61/362B01D67/0011B01D67/0079B01D2323/21B01D61/027B01D71/44Y10T428/249991B01D71/701B01D67/00793
Inventor K·德希特S·穆伦斯L·热维斯
Owner FLEMISH TECH INST LTD
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