Preparation method of high-flux and anti-pollution reverse osmosis membrane and application of membrane

A reverse osmosis membrane, anti-pollution technology, used in semi-permeable membrane separation, chemical instruments and methods, osmosis/dialysis water/sewage treatment, etc. It is convenient for industrial scale-up production, the negative charge potential is reduced, and the hydrophilicity is enhanced.

Inactive Publication Date: 2014-12-24
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods do not significantly improve the performance of the membrane. At the same time, due to the side reactions of other small molecules introduced in the rea

Method used

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  • Preparation method of high-flux and anti-pollution reverse osmosis membrane and application of membrane
  • Preparation method of high-flux and anti-pollution reverse osmosis membrane and application of membrane
  • Preparation method of high-flux and anti-pollution reverse osmosis membrane and application of membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 (blank control embodiment group)

[0057] Prepare an aqueous solution of 8% by weight of p-phenylenediamine, soak the polysulfone support layer for 5 minutes, take it out and dry it.

[0058] Prepare a 1.0% by weight terephthaloyl chloride n-heptane solution, soak the polysulfone support layer for 5 minutes, take it out and evaporate it to dryness. Observe the surface of the membrane, immerse in pure water after the excess solution on the surface volatilizes, soak for 30 seconds, and rinse with clean water to obtain a reverse osmosis membrane.

[0059] Gained reverse osmosis membrane was operated continuously for 5 days in 250ppm NaCl solution, and the flux and desalination rate of the membrane were tested every other day, and the results were as follows Figure 6 shown.

Embodiment 2

[0061] Prepare a 0.1% by weight aqueous solution of o-phenylenediamine, soak the polysulfone support layer for 10 minutes, take it out and dry it.

[0062] Prepare a cyclohexane solution of 0.02% by weight of isophthaloyl chloride, then soak the polysulfone support layer for 10 minutes, take it out and evaporate it to dryness, then quickly immerse it in diethylaminoethanol with a mass concentration of 99.5%, soak for 10 minutes, Remove the diaphragm, evaporate to dryness, and rinse with water to obtain a reverse osmosis membrane.

[0063] Test its flux and desalination rate, and compare with embodiment 1, the result is as follows figure 1 shown.

[0064] In addition, the obtained reverse osmosis membrane was continuously operated in 250ppm NaCl solution for 5 days, and the flux and desalination rate of the membrane were tested every other day, and the results were as follows: Figure 7 shown.

Embodiment 3

[0066] Prepare a 10% by weight aqueous solution of p-phenylenediamine, soak the polysulfone support layer for 10 seconds, take it out and dry it.

[0067] Prepare an isoparaffin solution of 1.0% by weight of isophthaloyl chloride+1.0% of isophthaloyl chloride, then soak the polysulfone support layer for 10 seconds, take it out and evaporate it to dryness, and then quickly immerse in 2 -In aminopropanol, soak for 10 seconds, remove the diaphragm, evaporate to dry, rinse with water to obtain a reverse osmosis membrane.

[0068] Test its flux and desalination rate, and compare with embodiment 1, the result is as follows figure 2 shown.

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Abstract

The invention provides a preparation method of a high-flux and anti-pollution reverse osmosis membrane. The preparation method of the high-flux and anti-pollution reverse osmosis membrane comprises the following steps: soaking a support layer in an aqueous solution with multifunctional aromatic amine compounds, taking the support layer out, drying the support layer, then soaking the support layer in a multifunctional acyl chloride oil phase solution, volatilizing and drying the support layer, then soaking the support layer in a modifier for 10-600 seconds, taking the support layer out and poaching the support layer in pure water to obtain the high-flux and anti-pollution reverse osmosis membrane, wherein the modifier is selected from any one of monoethanolamine, diethanol amine, triethanolamine, dimethylaminoethanol, diethylaminoethanol, 2-amino-propanol, dimethyl amine isopropyl alcohol, 3-amino-isopropyl alcohol and the like. According to the high-flux and anti-pollution reverse osmosis membrane prepared by the method, the hydrophilcity of the membrane can be improved; the salt removing rate remains at the level before modification; the charge performance of the membrane surface is reduced; the effect of shielding pollution of the charge substances in the running water is reduced; the high-flux and anti-pollution reverse osmosis membrane is suitable for industrial production and capable of meeting the requirements for long-term operation under the ultra-low voltage condition.

Description

【Technical field】 [0001] The invention relates to a reverse osmosis membrane, in particular to a preparation method of a modified reverse osmosis membrane and an application of the reverse osmosis membrane obtained by the method. 【Background technique】 [0002] Reverse osmosis membranes are widely used in the field of water treatment, and most of the current commercial membranes are polyamide composite membranes. For example, the commonly used polyamide reverse osmosis membrane, its technical principle is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water, and has the advantages of good water quality, low energy consumption, no pollution, simple process, and easy o...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D71/68B01D67/00B01D69/02C02F1/44
Inventor 陈亦力夏建中彭鹏于云宋冠军关晶
Owner BEIJING ORIGIN WATER FILM TECH
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