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Method for online preparing high-throughput composite reverse osmosis membrane

A reverse osmosis membrane, high-flux technology, applied in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc., can solve the problems of increasing storage and transportation costs, and achieve convenient rolling membrane elements , process stability, and the effect of reducing crosslinking density

Active Publication Date: 2014-03-26
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane elements stored in wet method need to be inspected regularly and the protection solution needs to be replaced, which greatly increases the cost of storage and transportation

Method used

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  • Method for online preparing high-throughput composite reverse osmosis membrane
  • Method for online preparing high-throughput composite reverse osmosis membrane
  • Method for online preparing high-throughput composite reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: On-line preparation of high-flux composite reverse osmosis membrane

[0034] The implementation steps of this embodiment are as follows:

[0035] An ultrafiltration base membrane with a pore size of 0.005-0.01 μm, which is composed of non-woven fabric and polysulfone support layer, is installed on the attached figure 1 On the unwinding shaft of the film coating machine shown, start the active motor, and the leading cloth on the film coating machine starts to run at a speed of 2m / min. Under the traction of the leading cloth of the film coating machine, the ultrafiltration base film first passes through the The aqueous phase tank of 2.0g / L m-phenylenediamine (MPD) aqueous solution forms a layer of aqueous solution film on described ultrafiltration base membrane; Then

[0036] By the oil phase groove that the n-hexane solution of 1.0g / L trimesoyl chloride (TMC) is housed, m-phenylenediamine and trimesoyl chloride are interfacially polymerized at the oil-water i...

Embodiment 2

[0049] Embodiment 2: On-line preparation of high flux composite reverse osmosis membrane

[0050] Carry out according to the same method described in Example 1, just add 200ppm, 500ppm, 1000ppm, 2000ppm and 3000ppm potassium permanganate solution by weight respectively in the oxidant tank, control the liquid level height and the film coating machine running speed, make ultrafiltration The time for the base film to pass through the oxidant tank is 1 minute. In this way, a high-flux polyamide composite reverse osmosis membrane is prepared. The properties of the prepared membrane were measured by the method described in the specification of this application, and the results are listed in Table 1.

[0051] Table 1: Performance of high flux composite reverse osmosis membrane in this example

[0052]

[0053]

[0054] From the results listed in Table 1, it can be seen that the flux is significantly improved when the membrane is treated with different concentrations of oxidan...

Embodiment 3

[0055] Embodiment 3: On-line preparation of high flux composite reverse osmosis membrane

[0056] Carry out according to the same method described in embodiment 1, just add respectively by weight 200ppm, 300ppm, 400ppm, 500ppm polyvinyl alcohol solution in the protective solution tank. In this way, a high-flux polyamide composite reverse osmosis membrane is prepared. The properties of the prepared membrane were measured by the method described in the specification of this application, and the results are listed in Table 2.

[0057] Table 2: Performance of high flux composite reverse osmosis membrane in this example

[0058]

[0059] As can be seen from the results in Table 2, the use of different concentrations of PVA to coat the surface of the membrane can play a good protective role. The higher the PVA concentration, the higher the desalination rate of the high-flux composite reverse osmosis membrane. The more the flux is reduced, the performance of the high-flux compos...

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Abstract

The invention discloses a method for online preparing a high-throughput composite reverse osmosis membrane. The method comprises the following steps of using a membrane coating machine to enable an ultrafiltration base membrane to pass through m-phenylenediamine aqueous solution, normal hexane solution of trimesoyl chloride, an oven, a purge tank, an oxidation tank, a reduction cell, a glycerite tank and a protective liquid tank; drying in the oven to obtain the high-throughput composite reverse osmosis membrane. The method has the characteristics that the process is simple, the water flux of the membrane is high, dry films of the high-throughput composite reverse osmosis membrane can be directly produced, membrane components can be wound conveniently, large-scale production can be realized, the process is stable, and the like. The high-throughput composite reverse osmosis membrane can be applied in the field of household water purification, municipal administration tap water is utilized to supply pressure without an additional booster pump, the cost is greatly reduced, and the energy is saved.

Description

【Technical field】 [0001] The invention belongs to the field of water treatment. More specifically, the present invention relates to an online method for preparing a high-flux composite reverse osmosis membrane. 【Background technique】 [0002] As people pay more attention to the safety of drinking water, reverse osmosis pure water machine is gradually becoming the mainstream of modern household water purification products. It uses reverse osmosis filtration technology, and the core component is reverse osmosis membrane. Only water molecules can pass through the reverse osmosis membrane. And keep it for drinking; bacteria, viruses (including SARS virus and the world's smallest mad cow virus can be effectively intercepted), scale, heavy metal ions, radioactive substances and other harmful substances, various pollutants, and soluble salts All ions cannot pass through the membrane, but are discharged as concentrated water. The reverse osmosis pure water machine ensures the safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/10B01D69/12B01D71/68C02F1/44
Inventor 陈亦力程帅林勇任海勇肖宏康赵晔
Owner BEIJING ORIGIN WATER FILM TECH
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