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Selective membrane having a high fouling resistance

A technology of selected, hydrophilic membranes, applied in the field of selective membranes, which can solve the problems of reduced membrane flux, scaling, etc.

Active Publication Date: 2008-08-20
SAEHAN INDS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The problem encountered with the various composite polyamide reverse osmosis membranes described above is fouling, which is the undesired adsorption of solutes to the membrane, thereby causing a decrease in the flux through the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A 140 μm thick microporous polysulfone support layer comprising a non-woven fabric backing was impregnated with 2wt% m-phenylenediamine (meta-phenylenediamine (MPD)) and 0.2wt% 2-ethyl-1,3-hexanediamine Alcohol (2-ethyl-1,3-hexanediol) aqueous solution for 40 seconds. Excess aqueous solution in the support layer is drained through nip rollers. The supporting layer of the coated membrane was soaked in Isopar containing 0.1wt% trimesoyl chloride (TMC). solvent (Exxon Company)) for 1 minute, then drain the excess organic solution in the support layer. Air-dry the result product composite film about 1 minute, then soak in 0.05wt% 4,8-diacyl-2,6,10-trihydroxyl 1,11-undecanediamine (4,8-dioxa-2 , 6,10-trihydroxy-1,11-undecanediamine (DOTHMA)) aqueous solution for 2 minutes. 0.2% Na at room temperature 2 CO 3 The resulting product was rinsed in aqueous solution for 30 minutes and then rinsed in deionized water again.

[0056] The initial performance of the membrane was ...

Embodiment 2

[0058] This embodiment 2 refers to the method of embodiment 1. The difference is: using 4,7-diacyl-2,9-dihydroxy-1,10-decanediamine (4,7-dioxa-2,9-dihydroxy-1,10-decanediamine (DODHDA)), Instead of DOTHMA, the product films obtained under the same conditions as described in Example 1 above are shown in Table 1.

Embodiment 3

[0060] This embodiment 3 refers to the method of embodiment 1. The difference is: using 3-amino-1,2-propanediol (3-amino-1,2-propanediol (APDL)) instead of DOTHMA, the product film obtained under the same conditions described in Example 1 above is shown in Table 1 shown.

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PUM

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Abstract

A selective membrane with high fouling resistance. In one embodiment, the selective membrane is a composite polyamide reverse osmosis membrane, a hydrophilic membrane is applied on the polyamide layer of the composite polyamide reverse osmosis membrane, and the hydrophilic membrane is prepared by co- Valence bonding of a hydrophilic compound to the residual acid chloride of the polyamide membrane; the hydrophilic compound comprising: (i) at least one reactive group suitable for direct covalent bonding to the polyamide membrane, the at least one reactive group being at least a primary amine and One of the secondary amines; and (ii) at least one hydrophilic group selected from the group comprising: hydroxyl, carbonyl, trialkoxysilane, anion, and tertiary amine; (iii) wherein the Hydrophilic compounds are exclusive of polyethers.

Description

technical field [0001] The present invention relates to selective membranes, in particular to selective membranes having a high fouling resistance. Background technique [0002] It is well known that solutes can be separated from their solvents by using various selective membranes including - membranes in ascending order of pore size - reverse osmosis membranes, ultrafiltration membranes, microfiltration membranes. One of the uses of reverse osmosis membranes is to desalinate brackish water or seawater in advance to provide a large amount of crude pure salt water suitable for industry, agriculture or domestic use. Desalination of brackish or seawater using reverse osmosis membranes involves filtering salt and other dissolved ions or molecules out of the brine one by one by forcing the brine through the reverse osmosis membrane. The ions or molecules do not pass through the reverse osmosis membrane. The osmotic pressure hinders the reverse osmosis process, and the higher th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D71/82B01D71/40
CPCB01D69/125B01D71/56B01D2323/02B01D2325/36B01D2323/30B01D67/00933B01D61/02
Inventor 具滋永洪成杓李钟和柳官泳
Owner SAEHAN INDS CO LTD
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