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Modified polyamide reverse osmosis membrane and manufacturing method thereof

A technology of reverse osmosis membrane and manufacturing method, applied in the field of membrane separation, to achieve the effects of avoiding easy agglomeration, low manufacturing cost, and simple production process

Inactive Publication Date: 2018-06-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN107138061A discloses a method for in-situ polymerization of amphoteric polyamine nanoparticles to modify polyamide membranes. The amphoteric polyamine monomer molecules are used as raw materials, and dopamine is used as a bionic binder. The amphoteric dopamine nanoparticles are formed by in-situ polymerization in an aqueous solution. Add polyamine monomer molecules to the aqueous solution, and prepare a polyamide membrane containing amphoteric polyamine nanoparticles through interfacial polymerization, but the membrane is a nanofiltration membrane, not a reverse osmosis membrane with a high salt rejection rate.

Method used

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  • Modified polyamide reverse osmosis membrane and manufacturing method thereof
  • Modified polyamide reverse osmosis membrane and manufacturing method thereof
  • Modified polyamide reverse osmosis membrane and manufacturing method thereof

Examples

Experimental program
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Embodiment 1

[0032] A method for manufacturing a modified polyamide ultra-low pressure reverse osmosis membrane embedded with silica gel nanoparticles, comprising the following steps:

[0033] (1) Aqueous solution A of polyfunctional amines: Dissolve 2 g of m-phenylenediamine in 100 g of pure water, and add 2 g of triethylamine in sequence, then adjust solution A to pH 10.0 with pH 1 aqueous hydrochloric acid solution, and stir evenly;

[0034](2) Organic solution B for configuring polyfunctional acyl halides and silanes and / or alkoxides: add 0.15 g of trimesoyl chloride and 0.02 g of silicon tetrachloride successively in 100 g of solvent oil (ISOPAR-G), and stir Uniform and completely dissolved, wherein the concentration of trimesoyl chloride is 0.15wt%, and the concentration of silicon tetrachloride is 0.02wt%;

[0035] (3) Interfacial polymerization reaction: put the cleaned wet porous polysulfone support layer (pore size 0.01 μm) into solution A, contact time is 120s, dry the water dro...

Embodiment 2

[0046] Except replacing 0.02g of silicon tetrachloride in step 2) with 0.01g of titanium ethoxide and 0.01g of silicon tetrachloride, a composite polyamide reverse osmosis membrane was produced according to the same formula and process as in Example 1.

[0047] The membrane has a pure water flux of 7.4L m measured at 5-15bar -2 h -1 · bar -1 , the water flux to 25℃, 2000ppm brine solution is 6.1L m -2 h -1 · bar -1 , the sodium chloride rejection rate is 98.3%, and the results are shown in Table 1.

Embodiment 3

[0049] Except that the silicon tetrachloride of 0.02g in step 2) is replaced by the phenyl silicon trichloride of 0.01g and the butyl titanate of 0.01g, make composite polyamide reverse osmosis according to the formula and process identical with embodiment 1 membrane.

[0050] The pure water flux measured by the membrane at 5-15bar is 8.2L m -2 h -1 · bar -1 , the water flux to 25℃, 2000ppm brine solution is 7.0L m -2 h -1 · bar -1 , the sodium chloride rejection rate is 97.6%, and the results are shown in Table 1.

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Abstract

The invention discloses a modified polyamide reverse osmosis membrane and a manufacturing method thereof. The membrane comprises a porous supporting layer and a polyamide desalting layer formed on thesurface of the porous supporting layer by interfacial polymerization, and the polyamide desalting layer is an organic-inorganic nano-composite layer for in situ generating silica nano-particles embedded in the polyamide desalting layer. The water permeation flux of a membrane is greatly improved while maintaining the high retention rate of a sodium chloride reverse osmosis membrane to sodium chloride, so the membrane can be used in an ultralow-pressure energy-saving filtration process. The in-situ generation of the silica nano-particles in the polyamide desalting layer of effectively avoids the easy agglomeration and escaping risks of the nano-particles, and makes high-water permeation flux water channels, so the produced membrane has the advantages of high salt retention rate , high permeation flux, low energy consumption, simple production process and low manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a modified polyamide reverse osmosis membrane and a manufacturing method thereof. Background technique [0002] The polyamide reverse osmosis membrane is a pressure-driven membrane that effectively retains all dissolved salts and organics with a molecular weight greater than 100, while allowing water molecules to pass through. It typically has a rejection rate of 95%-100% for sodium and chloride ions and is widely used in the desalination of brackish water or seawater to provide salt-free water for industrial, commercial or domestic use. [0003] At present, commercial polyamide reverse osmosis membranes are mostly composite membranes, which are generally obtained by compounding an ultra-thin densified layer on the surface of a porous support layer by interfacial polymerization technology. The porous support layer, also known as the base membrane, plays the role of e...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D61/02B01D67/00C02F1/44
CPCB01D61/025B01D67/0006B01D71/56C02F1/441Y02A20/131B01D69/1251B01D69/02B01D2325/20C02F2305/08
Inventor 周勇沈红梅王书浩高从堦
Owner ZHEJIANG UNIV OF TECH
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