Method for wetting hydrophobic porous polymeric membranes to improve water flux without alcohol treatment

A polymer membrane, hydrophobic technology, applied to wet hydrophobic porous polymer membrane to improve water flux without alcohol treatment, can solve the problem of reducing chemical solubility, non-wetting, low affinity of hydrophobic materials, etc. question

Inactive Publication Date: 2007-01-31
美国海德能公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increased hydrocarbon chain length also reduces the solubility of the chemical in water
Some hydroxyl compounds have good water solubility, but low affinity for hydrophobic materials and high surface tension, resulting in non-wetting of hydrophobic porous membranes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] To calculate the intrinsic water flux of raw polypropylene hollow fiber membranes, the membranes were "wetted" by immersion in a 50% by volume aqueous solution of isopropanol for 10 minutes at one atmosphere, followed by Rinse with deionized water for 5 minutes. At equilibrium, a flow rate of 16.5 ml / min was observed at one atmosphere pressure and room temperature. This value was used to compare the water flux of the membrane after treatment with the surfactant chemical solution described below.

[0038] A clear solution containing 10 wt% SDBS in water was prepared at room temperature. A small bundle of polypropylene hollow fibers with a pore size of 0.2 microns was then immersed in the SDBS solution for 30 minutes at room temperature. The fiber bundles were removed from solution and then rinsed with deionized water for 5 minutes at one atmospheric pressure and room temperature. After rinsing, the water flux was 16.0 ml / min compared to the membrane treated with isopr...

Embodiment 2

[0040] The method described in Example 1 was repeated using different chemicals and concentrations to evaluate their effect on wetting of hydrophobic polypropylene porous membranes. The results are summarized in Table 1. It can be seen that the hydrophobic membrane is only wetted by 50% isopropanol and 20% sodium dodecyl sulfate (SDS). All other chemicals tested failed to wet the membrane (ie, no water flux was observed after impregnation with other chemical solutions). To measure the intrinsic water flux of the fiber bundles, after soaking with isopropanol or SDS, the membranes were submerged in 50% isopropanol.

[0041] chemicals

[0042] Triton X-100

Embodiment 3

[0044] Clear chemical solutions with different SDBS concentrations were prepared in water at room temperature. A bundle of polypropylene hollow fiber membranes containing 14,000 1 meter long fibers was pressurized in the solution at 20 psi for 15 minutes, then the flux rate was measured at room temperature at 15 psi. In addition, the intrinsic water flux of the treated fiber bundles was determined by immersing the treated fiber bundles in a 50% by weight solution of isopropanol for 10 minutes, rinsing with water for 5 minutes, and measuring at 15 psi. The results are shown in Table 2.

[0045] Concentration of SDBS (weight %)

[0046] It can be seen in Table 2 that when the concentration of SDBS is lower than 1%, the flux rate of membrane bundles is lower. The flux rates of the membranes treated with SDBS concentrations greater than 1 wt% were almost the same as those treated with the 1 wt% solution because the membrane bundles were fully wetted in the 1 wt% SDBS so...

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Abstract

The present invention provides a method of substantially instantaneously wetting a hydrophobic porous polymer membrane and rendering the hydrophobic membrane hydrophilic. The method involves treating the membrane with a non-alcoholic aqueous solution of a low molecular weight surfactant, followed by drying the treated membrane. The low molecular weight surfactant has high molecular affinity to the hydrophobic membrane matrix and high water solubility; the preferred surfactant is sodium dodecylbenzenesulfonate (SDBS). The method is particularly suitable for the treatment of hydrophobic membranes such as those made of polyolefins, fluorinated or chlorinated polymers, polysulfone or polyethersulfone, preferably having a pore size of 0.01 micron to 1 micron. The present invention provides a wettable membrane because the aqueous surfactant solution is absorbed into the hydrophobic membrane.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to US Provisional Patent Application Serial No. 60 / 534,630, filed January 7,2004. technical field [0003] The present invention relates to the instant wetting of dry, untreated, non-pretreated hydrophobic porous polymeric membranes and to rendering hydrophobic fibers water-wettable and hydrophilic without the use of alcohol treatment. The term "hydrophilic" refers in the art to materials (fibers) that do not repel water. "Water wettable" refers to fibers that are sufficiently hydrophilic that water will absorb into the pores of the membrane at or near atmospheric pressure. Background technique [0004] Many polymers used in commercially available synthetic filtration membranes have inherently hydrophobic material properties. Among these hydrophobic polymers, polypropylene (PP), polyethylene (PE), polysulfone (PS), polyethersulfone (PES), and polyvinylidene fluoride (PVDF) are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D29/11B01D67/00B05D3/02C08J7/056C08J7/06
CPCB01D2323/08C08J7/065B01D69/02B01D2323/02B01D67/0088C08J7/056B01D2323/081
Inventor 尤恩·II·罗克雷格·罗杰·巴特尔斯
Owner 美国海德能公司
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