Polyamide composite reverse osmosis membrane containing nano materials

A technology of reverse osmosis membrane and nanomaterials, which is applied in the field of polyamide composite reverse osmosis membrane, can solve the problems of poor anti-pollution ability, short service life of the membrane, resistance to oxidation, etc. increased effect

Inactive Publication Date: 2010-12-15
VONTRON MEMBRANE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most commonly used reverse osmosis membrane in industry is polyamide composite membrane. Polyamide membrane has high desalination rate, large flux, excellent chemical stability, wide pH range (4-11), biocorrosion resistance, and low operating pressure requirements. Advantages, but not resistant to oxidation, poor anti-pollution ability, poor chlorine resistance, resulting in short service life of the membrane

Method used

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  • Polyamide composite reverse osmosis membrane containing nano materials
  • Polyamide composite reverse osmosis membrane containing nano materials
  • Polyamide composite reverse osmosis membrane containing nano materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: The polysulfone solution was prepared according to 15 kg of polysulfone: 74.5 kg of dimethylacetamide (DMAC): 10 kg of ethylene glycol dimethyl ether (DMPE), and 0.5 kg of nano silicon oxide.

[0017] The prepared polysulfone solution is coated on the non-woven fabric, and then the interface reaction is carried out on the polysulfone layer to form an aromatic polyamide layer, and finally a layer of electrically neutral coating is coated on the polyamide layer to form a polyamide composite reaction. permeable membrane.

[0018] The polyamide composite reverse osmosis membrane prepared above was used as water inflow of 2000ppm NaCl aqueous solution, and the initial performance test was carried out under the conditions of 25°C, pH value of 7.5, and pressure of 225psi, and then operated under the above conditions for 72 hours. Its performance, the results are shown in Table 1.

[0019] Table 1

[0020]

Embodiment 2

[0022] According to polysulfone 40kg: dimethylacetamide (DMAC), dimethylformamide (DMF), the arbitrary ratio mixture 140kg of N methylpyrrolidone (NMP) and dimethyl sulfoxide (DMSO); Polyethylene glycol ( PEG), polyvinylpyrrolidone (PVP), ethylene glycol dimethyl ether (DMPE), polyvinyl alcohol (PVA) in any ratio mixture 30kg; nano-titanium oxide, nano-zinc oxide, nano-alumina, nano-iron oxide, nano-oxide The polysulfone solution was prepared with 40 kg of any mixture of silicon and nano-calcium oxide.

[0023] The prepared polysulfone solution is coated on the non-woven fabric, and then the interface reaction is carried out on the polysulfone layer to form an aromatic polyamide layer, and finally a layer of electrically neutral coating is coated on the polyamide layer to form a polyamide composite reaction. permeable membrane.

[0024] Examples 3-11 prepared polysulfone solution according to the proportion shown in Table 2, and the method for preparing polyamide composite re...

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Abstract

The invention provides a polyamide composite reverse osmosis membrane containing nano materials. The polysulfone solution of the membrane is prepared from the following raw materials by weight: 15-30 parts of polysulfone, 45-75 parts of organic solvents, 0.5-40 parts of organic pore-forming agents and 0-30 parts of nano inorganic materials. The method of membrane preparation by phase inversion is adopted on the polysulfone porous layer and in the preparation process, the polysulfone is taken as the polymer matrix and the organic pore-forming agents and the nano inorganic materials are added after the organic solvents are added. Addition of the organic pore-forming agents can increase the void ratio of the membrane, thus greatly improving the water flux of the membrane. Addition of the nano inorganic materials reduces the defect rate of the formed membrane, ensures the formed polyamide layer to be denser in the subsequent interfacial polymerization procedure, greatly improves the desalination rate of the membrane, ensures the mechanical strength of the membrane to be compensated and improves the compaction resistance of the reverse osmosis membrane under the condition of ensuring the desalination rate and the water flux, thus prolonging the service life of the membrane.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane, in particular to a polyamide composite reverse osmosis membrane containing nanomaterials. Background technique [0002] Membrane science and technology is a multidisciplinary emerging technology. In recent years, on the basis of the development and interpenetration of various disciplines, membrane science and technology has developed rapidly, and has become a new growth point for the development of chemistry and chemical engineering disciplines, and is also the focus of contemporary high-tech development. Membrane separation technology refers to the method of separating, grading, purifying and enriching two-component or multi-component solutes or solvents with artificially synthesized or natural membranes, driven by external energy or chemical potential difference. Microfiltration, ultrafiltration, nanofiltration and reverse osmosis. As a modern new high-efficiency separation technology, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D61/02
CPCY02A20/131
Inventor 吴宗策赵晓阳陶建王琦
Owner VONTRON MEMBRANE TECH CO LTD
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