Novel seawater desalination reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane and a new type of technology, applied in the field of preparation of reverse osmosis membranes for seawater desalination, can solve the problems of shortened cleaning cycle, shortened service life, increased cost, etc., and achieve a simple preparation method, high retention rate, easy to scale up production Effect

Pending Publication Date: 2018-03-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In addition, due to the presence of colloids, microorganisms, organic matter, etc. in seawater, seawater desalination reverse osmosis membranes are prone to fouling and fouling, resulting in reduced water flux of reverse osmosis membranes, shortened service life, shortened cleaning cycles and increased costs

Method used

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  • Novel seawater desalination reverse osmosis membrane and preparation method thereof
  • Novel seawater desalination reverse osmosis membrane and preparation method thereof
  • Novel seawater desalination reverse osmosis membrane and preparation method thereof

Examples

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example 1

[0035] Example 1: Dissolve trimesoyl chloride directly in n-hexane to prepare a solution of trimesoyl chloride with a mass concentration of 0.1%. Then m-phenylenediamine was dissolved in distilled water to prepare a solution with a mass concentration of 2.0%. O-phenylenediamine solution, p-phenylenediamine solution and m-phenylenediamine solution are prepared. Cut the PS-35 or PAN-400 substrate into a membrane of about 20cm×10cm, and completely immerse it in the aqueous phase monomer solution (m-phenylenediamine solution, o-phenylenediamine solution, or p-phenylenediamine solution) Medium 2 min. Then take out the substrate and place it on a glass plate, remove excess solution with a glass rod, and fix the substrate on the glass plate with adhesive tape. Pour the n-hexane solution of trimesoyl chloride on it, carry out the interfacial polymerization reaction for 10 seconds, and pour off the excess trimesoyl chloride solution. Then the film was baked in an oven at 80°C for 20...

example 2

[0036]Example 2: Dissolve trimesoyl chloride directly in n-hexane to prepare a solution of trimesoyl chloride with a mass concentration of 0.1%. Dissolve 2,3-diaminotoluene in distilled water to prepare a solution with a mass concentration of 2.0%. For the preparation of the 2,4-diaminotoluene solution, the 2,4-diaminotoluene was firstly recrystallized with anhydrous methanol, and then dissolved in distilled water to prepare a solution with a mass concentration of 2%. As for the 2,5-diaminotoluene solution, triethylamine is added to the 2,5-diaminotoluene sulfate to neutralize the sulfate, and then distilled water is added to prepare a solution with a mass concentration of 2%. Cut the PS-35 or PAN-400 substrate into a membrane of about 20cm×10cm, and completely immerse it in the aqueous phase monomer solution (2,3-diaminotoluene solution, 2,4-diaminotoluene solution, or 2,5-diaminotoluene solution) for 2 min. Then take out the substrate and place it on a glass plate, remove ...

example 3

[0037] Example 3: The cross-sectional morphology of the new reverse osmosis membrane and the interface morphology of the ultrafiltration membrane substrate are as follows: figure 1 As shown, it can be seen that the ultrafiltration membrane substrate is an asymmetric porous structure, such as figure 1 (a) and 1(b). Moreover, the interface morphology of PS35 and PAN400 is very different, which is related to the preparation method and conditions. After interfacial polymerization on its surface, a cross-linked polyamide filter layer with a thickness of about 100-200 nanometers is formed, such as figure 1 (c) and 1(d). According to the data of infrared spectrum ( figure 2 ) shows that at wavenumbers 1600-1700 cm -1 There is an obvious vibration absorption peak of the amide bond, indicating the formation of a cross-linked polyamide filter layer. In addition, 2950 cm -1 The vibration peak of the methyl substitution on the benzene ring is at figure 2 (c) is also enhanced rela...

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Abstract

The invention relates to a novel seawater desalination reverse osmosis membrane and a preparation method thereof. The seawater desalination membrane with novel structure and novel function is preparedby carrying out an interfacial polymerization reaction on m-phenylenediamine, o-phenylenediamine and p-phenylenediamine monomers with substituent groups, and a trimesoyl chloride monomer; and the novel seawater desalination reverse osmosis membrane has various functions of chlorine resistance, pollution resistance, solvent resistance and the like and is used for various fields of efficient seawater desalination, brackish water desalination, hard water softening and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of seawater desalination reverse osmosis membranes, in particular to a novel seawater desalination reverse osmosis membrane and a preparation method thereof, in particular to a reverse osmosis membrane prepared by substituting aromatic diamine monomers through interfacial polymerization, which has chlorine resistance It has multiple functions such as anti-pollution and solvent resistance, and is used in various fields such as high-efficiency seawater desalination, brackish water desalination, and hard water softening. Background technique [0002] Currently, the reverse osmosis membranes used in seawater desalination are mainly cellulose acetate membranes and cross-linked aromatic polyamide composite membranes prepared by the phase inversion method. Due to relatively low water flux and rejection, cellulose acetate membrane has a narrow application pH range (4-8), poor temperature stability (0-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D61/02B01D67/00C02F1/44C02F103/08
CPCB01D61/025B01D67/0006B01D71/56B01D2325/30C02F1/441C02F2103/08Y02A20/131
Inventor 马洪洋
Owner BEIJING UNIV OF CHEM TECH
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