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Reverse osmosis membrane based on dimethyl carbonate and preparation method thereof

A technology of dimethyl carbonate and reverse osmosis membrane, applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems of environmental protection, large co-solvent pollution, high reverse osmosis membrane flux, etc. To achieve the effect of increasing strength

Inactive Publication Date: 2020-08-25
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the shortcoming of above-mentioned prior art, provide a kind of reverse osmosis membrane based on dimethyl carbonate and preparation method thereof; The problem of obtaining high reverse osmosis membrane flux under the premise of permeable membrane rejection rate

Method used

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  • Reverse osmosis membrane based on dimethyl carbonate and preparation method thereof
  • Reverse osmosis membrane based on dimethyl carbonate and preparation method thereof
  • Reverse osmosis membrane based on dimethyl carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The surface of the polysulfone-based membrane was immersed in an aqueous phase solution containing 0.4% triethylamine, 2.0% camphorsulfonic acid and 1.4% m-phenylenediamine for 10 seconds to fully infiltrate the basement membrane with the aqueous phase solution. Subsequently, the solution was poured off. Next, after ensuring that there was no visible liquid on the surface of the membrane, the surface of the membrane was immersed in a n-heptane solution containing 0.04% trimesoyl chloride and 0.5% dimethyl carbonate to initiate interfacial polymerization. After reacting for 10 s, the membrane was heat-treated at 60°C for 1 min to prepare an aromatic polyamide composite reverse osmosis membrane, which was then fully washed with deionized water immediately.

[0041] The prepared reverse osmosis membrane is placed in the membrane test device, such as Figure 4 . The raw material liquid is a 2000 ppm sodium chloride aqueous solution. Before adding the raw material solutio...

Embodiment 2

[0043] The surface of the polysulfone-based membrane was immersed in an aqueous phase solution containing 0.7% triethylamine, 2.2% camphorsulfonic acid and 1.6% m-phenylenediamine for 20 seconds to fully infiltrate the basement membrane with the aqueous phase solution. Subsequently, the solution was poured off. Next, after ensuring that there was no visible liquid on the surface of the membrane, the surface of the membrane was immersed in a n-heptane solution containing 0.08% trimesoyl chloride and 1% dimethyl carbonate to initiate interfacial polymerization. After reacting for 20 s, the membrane was heat-treated at 70°C for 3 min to prepare an aromatic polyamide composite reverse osmosis membrane, which was immediately washed thoroughly with deionized water.

[0044] According to the method of Example 1, filter 2000ppm sodium chloride aqueous solution at 15.5bar and 25°C to test the membrane performance, and the flux and rejection rate of the composite reverse osmosis membran...

Embodiment 3

[0046] The surface of the polysulfone-based membrane was immersed in an aqueous phase solution containing 0.9% triethylamine, 2.4% camphorsulfonic acid and 1.8% m-phenylenediamine for 25 seconds to fully infiltrate the basement membrane with the aqueous phase solution. Subsequently, the solution was poured off. Next, after ensuring that there was no visible liquid on the surface of the membrane, the surface of the membrane was soaked in a n-heptane solution containing 0.1% trimesoyl chloride and 1.2% dimethyl carbonate to initiate interfacial polymerization. After reacting for 25 s, the membrane was heat-treated at 75°C for 4 min to prepare an aromatic polyamide composite reverse osmosis membrane, which was then fully washed with deionized water immediately.

[0047] According to the method of Example 1, filter 2000ppm sodium chloride aqueous solution at 15.5bar and 25°C to test the membrane performance, and the flux and rejection rate of the composite reverse osmosis membrane...

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Abstract

The invention discloses a reverse osmosis membrane based on dimethyl carbonate and a preparation method thereof. According to the method, a polysulfone support membrane is used as a base membrane, m-phenylenediamine is used as a water-phase monomer, trimesoyl chloride is used as an organic-phase monomer, a green solvent dimethyl carbonate is used as an organic-phase cosolvent, n-heptane is used asan organic-phase solvent, and the reverse osmosis membrane is prepared by adopting an interfacial polymerization method. In the whole process, dimethyl carbonate is used as a cosolvent, the compatibility of a water phase and an organic phase is enhanced, so that the diffusion rate of a water phase monomer (m-phenylenediamine) to the organic phase is increased, the interfacial polymerization reaction is more violent, the surface roughness of the reverse osmosis membrane is increased, the surface roughness of a separation layer of the reverse osmosis membrane is increased, and the flux of the reverse osmosis membrane is increased.

Description

【Technical field】 [0001] The invention belongs to the technical field of composite reverse osmosis membrane preparation, and in particular relates to a reverse osmosis membrane based on dimethyl carbonate and a preparation method thereof. 【Background technique】 [0002] Membrane separation technology, as a new and efficient chemical separation technology, plays an important role in solving the water resource crisis (Y.Okamoto, J.H.Lienhard, How RO membrane performance and other performance factors affect process cost and energy use: A review, Desalination, 2019 , 470:114064.). Reverse osmosis membrane is one of the important types of separation membranes used in water treatment process. It has been widely used in seawater / brackish water desalination, ultrapure water preparation, wastewater treatment, food concentration and other fields. Selective permeation performance (flux, rejection rate) is an important evaluation index of reverse osmosis membrane (K.P.Lee, T.C.Arnot, D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D67/00B01D69/02B01D61/02
CPCB01D61/025B01D67/0006B01D69/02B01D69/10B01D69/125B01D71/56
Inventor 时孟琪马晓迅
Owner NORTHWEST UNIV(CN)
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