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Reverse osmosis membrane and preparation method thereof

A technology of reverse osmosis membrane and support layer, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of poor pollution resistance of reverse osmosis composite membrane

Inactive Publication Date: 2020-03-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of poor pollution resistance of reverse osmosis composite membranes in the prior art, the invention provides a reverse osmosis membrane and its preparation method

Method used

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  • Reverse osmosis membrane and preparation method thereof

Examples

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preparation example Construction

[0074] The preparation method of 2,3-propylene oxide sodium sulfonate is the same as in the literature (Fine Chemical Intermediates, Volume 35, Phase 1), and its detailed steps are as follows:

[0075]Dissolve 10g of sodium 3-chloro-2-hydroxypropanesulfonate in 40mL of water, and add NaOH solution (2.6gNaOH, 20mL of water) dropwise to the solution while stirring for 1.5h, then continue the reaction for 0.5h. Use 1mol / L hydrochloric acid to drop the solution to neutrality, then use a mixed solution of ethanol and water (3:1 in mass ratio) for recrystallization, and finally filter to obtain a white solid.

Embodiment 1

[0080] The reverse osmosis membrane diaphragm M1 that comparative example 1 makes is dipped in (taking solvent as 100 parts by weight, containing 5 parts of 2,3-epoxypropylene sodium sulfonate and 0.5 part of 2,4,6-tri(dimethyl In 20 parts of glycerol) aqueous solution of aminomethyl) phenol, immersion time is 30s. After taking it out, put the membrane into an oven at 70°C and heat for 5 minutes to obtain a dry reverse osmosis composite membrane. After storing the reverse osmosis membrane at normal temperature and in a dry state for 7 days, the pollution-resistant reverse osmosis membrane N1 was obtained. The thickness of the anti-pollution layer was 35 nm.

[0081] After immersing the obtained composite reverse osmosis membrane N1 in water for 24 hours, the water flux and the desalination rate of NaCl (2000ppm) were measured at a pressure of 1.55MPa and a temperature of 25°C. The results are shown in Table 1. And under the same temperature and pressure conditions, its fouli...

Embodiment 2

[0083] The reverse osmosis membrane diaphragm that comparative example 1 makes is dipped in (taking solvent as 100 parts by weight, containing 3 parts of 2,3-epoxypropylene sodium sulfonate and 1 part of 2,4,6-tris(dimethylamino In 10 parts of sucrose) aqueous solution of methyl) phenol, the immersion time is 1 min. After taking it out, put the membrane into a 40°C oven and heat for 10 minutes to obtain a dry reverse osmosis composite membrane. After the reverse osmosis membrane was stored at normal temperature and in a dry state for 3 days, the pollution-resistant reverse osmosis membrane N2 was obtained. The thickness of the anti-contamination layer was 21 nm.

[0084] After immersing the obtained composite reverse osmosis membrane N2 in water for 24 hours, the water flux and the desalination rate of NaCl (2000ppm) were measured at a pressure of 1.55MPa and a temperature of 25°C. The results are shown in Table 1. And under the same temperature and pressure conditions, its ...

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Abstract

The invention discloses a reverse osmosis membrane and a preparation method thereof. The reverse osmosis membrane comprises a support layer, a separation layer and a pollution-resistant layer, whereinthe support layer, the separation layer and the pollution-resistant layer are sequentially stacked from inside to outside, the separation layer has a cross-linked polyamide structure and is obtainedby carrying out interfacial polymerization on polyamine and polyacyl chloride, and the pollution-resistant layer is formed by branching and polymerizing 2,3-epoxypropane sodium sulfonate to the surface of polyamide through heat treatment under the action of a curing accelerator. According to the preparation method, 2,3-epoxypropane sodium sulfonate is branched and polymerized to the surface of a polyamide membrane, so that the hydrophilicity of the membrane is improved, the surface of the membrane is negatively charged, and the anti-pollution capability of the membrane to anionic surfactants or other negatively charged pollutants is improved; and the epoxy group is subjected to a self-polymerization reaction under the action of an accelerator to form a compact polymer layer, so that the hindering effect on salt ion penetration is improved so as to improve the salt rejection rate of the membrane.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a reverse osmosis membrane and a preparation method. Background technique [0002] Membrane separation is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Because membrane separation technology not only has the functions of separation, concentration, purification and refining, but also has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration, simple filtration process and easy control, it has been widely used in food, medicine, biological , Environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields have produced huge economic and social benefits, and have become one of the most important means in today's separation science. The core of membrane separation technology is the separation membrane. ...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/02B01D67/00B01D61/02
CPCB01D61/025B01D67/0002B01D69/02B01D71/56B01D2325/36
Inventor 张杨刘轶群潘国元于浩
Owner CHINA PETROLEUM & CHEM CORP
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