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Method for preparing reverse osmosis membrane by using 1-methylimidazole as aqueous phase additive

A technology for the preparation of additives and methylimidazole, which is applied in the fields of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., and can solve the problems of decreased rejection rate of reverse osmosis membranes, consumption of carboxylic acid groups, difficulty in preparing reverse osmosis membranes, etc. problem, to achieve the effects of easy implementation, simple preparation process and low cost

Active Publication Date: 2020-02-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the flux of the prepared membrane has been improved, the rejection rate of the prepared reverse osmosis membrane has decreased due to the interaction between calcium ions and carboxylic acid groups, which consumes the number of carboxylic acid groups (X.Hao, S. Gao, J. Tian, ​​Y. Sun, F. Cui, C. Y. Tang, Calcium-Carboxyl Intrabridging during Interfacial Polymerization: A Novel Strategy to Improve Antifouling Performance of Thin Film Composite Membranes, Environ. Sci. Technol., 53(2019) 4371-4379 .)
Therefore, it is difficult to prepare a reverse osmosis membrane with high flux and high rejection rate at the same time.

Method used

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  • Method for preparing reverse osmosis membrane by using 1-methylimidazole as aqueous phase additive
  • Method for preparing reverse osmosis membrane by using 1-methylimidazole as aqueous phase additive
  • Method for preparing reverse osmosis membrane by using 1-methylimidazole as aqueous phase additive

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Experimental program
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Effect test

Embodiment 1

[0023] Configure an aqueous phase solution containing 1-methylimidazole with a volume mass fraction of 0.1%, pour the configured aqueous phase solution on the surface of the support membrane, and remove the excess aqueous phase solution after fully soaking for 20 seconds. After the membrane surface is dry, pour the aqueous phase solution containing The 0.05% benzoyl chloride oil phase solution was reacted for 20s, and then the excess oil phase solution was removed to prepare a reverse osmosis membrane. Finally, the membrane was heat-treated at 70° C. for 4 minutes to prepare an aromatic polyamide composite reverse osmosis membrane added with 1-methylimidazole. Electron microscope pictures such as figure 1 shown.

[0024] At 1.55MPa and 25°C, the flux and rejection rate of the aromatic polyamide composite reverse osmosis membrane added with 1-methylimidazole were 53.41L / (m 2 • h) and 98.90%.

Embodiment 2

[0026] Configure an aqueous phase solution containing 1-methylimidazole with a volume mass fraction of 0.3%, pour the configured aqueous phase solution on the surface of the support membrane, and remove the excess aqueous phase solution after fully soaking for 30 seconds. After the membrane surface is dry, pour the aqueous phase solution containing The 0.10% benzoyl chloride oil phase solution was reacted for 30s, and then the excess oil phase solution was removed to prepare a reverse osmosis membrane. Finally, the membrane was heat-treated at 80° C. for 5 minutes to prepare an aromatic polyamide composite reverse osmosis membrane added with 1-methylimidazole. Electron microscope pictures such as figure 2 shown.

[0027] At 1.55Mpa and 25°C, the flux and rejection rate of the aromatic polyamide composite reverse osmosis membrane added with 1-methylimidazole were 72.85L / (m 2 • h) and 99.06%.

Embodiment 3

[0029] Configure an aqueous phase solution containing 1-methylimidazole with a volume mass fraction of 0.5%, pour the configured aqueous phase solution on the surface of the support membrane, and remove the excess aqueous phase solution after fully soaking for 40 seconds. After the membrane surface is dry, pour the aqueous phase solution containing The 0.20% benzoyl chloride oil phase solution was reacted for 40 seconds, and then the excess oil phase solution was removed to prepare a reverse osmosis membrane. Finally, the membrane was heat-treated at 90° C. for 6 minutes to prepare an aromatic polyamide composite reverse osmosis membrane added with 1-methylimidazole. Electron microscope pictures such as image 3 shown.

[0030] At 1.55MPa and 25°C, the flux and rejection rate of the aromatic polyamide composite reverse osmosis membrane added with 1-methylimidazole were 103.04L / (m 2 • h) and 98.37%.

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Abstract

The invention relates to a method for preparing a reverse osmosis membrane by using 1-methylimidazole as an aqueous phase additive. The aromatic polyamide composite reverse osmosis membrane is prepared by taking the 1-methylimidazole as an aqueous-phase solution additive and adopting an interfacial polymerization method. A support membrane is infiltrated into an aqueous-phase solution containing 1-methylimidazole, so that the support membrane is fully infiltrated by the aqueous-phase solution; the membrane is infiltrated into an oil-phase solution containing trimesoyl chloride to carry out interfacial polymerization reaction so as to form an aromatic polyamide separation layer; and heat treatment is performed on the membrane to obtain the aromatic polyamide composite reverse osmosis membrane. The disclosed method has the advantages that the preparation process is simple, the cost is relatively low, the implementation is easy, and the prepared aromatic polyamide composite reverse osmosis membrane has the characteristics of high flux and high rejection rate. In addition, the disclosed method can also provide references for preparation of other high-performance interfacial polymerization separation membranes.

Description

technical field [0001] The invention relates to a method for preparing a reverse osmosis membrane by using 1-methylimidazole as an aqueous phase additive, and belongs to the field of composite reverse osmosis membrane preparation. Background technique [0002] Reverse osmosis membrane technology is an important means to alleviate the crisis of water resources, and has been widely used in the fields of seawater / brackish water desalination, ultrapure water preparation, and wastewater treatment. It is of great significance to prepare reverse osmosis membrane with high flux and high rejection rate. High flux reverse osmosis membrane can reduce process energy consumption and equipment investment; high rejection rate reverse osmosis membrane can improve process efficiency and product water quality. Therefore, it is very important to design a reverse osmosis membrane with high flux and high rejection. [0003] The current mainstream reverse osmosis membrane is an aromatic polyamid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D69/10B01D69/02B01D67/00
CPCB01D69/02B01D69/105B01D69/125B01D71/56
Inventor 王志刘莹莹任六一魏新渝赵颂王纪孝
Owner TIANJIN UNIV