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Preparation method of high-throughput nano-composite seawater desalination membrane

A nano-composite, high-throughput technology, applied in chemical instruments and methods, seawater treatment, general water supply conservation, etc., can solve the problems of failure to form water flux compression resistance, stability, etc. The effect of sufficient reaction and accelerated reaction rate

Active Publication Date: 2018-07-24
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still fails to form a membrane with a balanced relationship between water flux, desalination rate, pressure resistance, and stability.

Method used

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  • Preparation method of high-throughput nano-composite seawater desalination membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Assemble the reaction bottle in an ice-water bath, add 720ml of concentrated sulfuric acid, then add 6g of nano-graphite powder into the reaction bottle, and finally add 36g of potassium permanganate slowly, control the reaction temperature not to exceed 20°C, and stir for a while Afterwards, raise the temperature to 60°C and continue to stir for 12 hours. After the reactants are cooled to room temperature, add 2L of deionized water and 20mL of 30% hydrogen peroxide in sequence, stir, and then wash the filter cake with 10% dilute hydrochloric acid for 3 times and suction filter , centrifuged, repeatedly washed with deionized water until the supernatant is neutral, centrifuged, and the final centrifuged product was dried in a vacuum at 60°C for 48 hours to obtain nano-graphene oxide;

[0020] (2) Add nano-graphene oxide and TEPA with a mass ratio of 3:1 into a reaction flask containing methanol, after ultrasonic dispersion, react at 85°C for 12h, filter, dry, grind an...

Embodiment 2

[0027] (1) Step (1) (2) is the same as embodiment 1;

[0028] (3) Preparation of polymer solution: weigh 36g of polysulfone, 16g of methyl cellulose, and 0.8g of modified nano-graphene oxide, mix and dissolve them in 147.2g of DMF, stir at 150°C for 6 hours at high speed, then transfer to a vacuum, statically Put defoaming, obtain polymer solution;

[0029] (4) Preparation of base film: After the water bath temperature rises to 80°C, the polymer solution in step (3) is subjected to liquid-solid phase conversion reaction on the non-woven fabric for 0.5min, and then the water bath temperature is lowered to 18°C ​​for full reaction After that, the preparation of the polymer base film is completed, and then the base film is soaked and stored in deionized water, and the film thickness is about 5.5mil;

[0030] (5) After weighing 35g m-phenylenediamine, 1gTEPA, 1g modified nano-graphene oxide, 10g ethanol, 0.2g sodium hydroxide and mixing, put into 952.8g deionized water and dissol...

Embodiment 3

[0034] (1) Step (1) (2) is the same as embodiment 1;

[0035] (3) Preparation of polymer solution: weigh 36g of polysulfone, 16g of methyl cellulose, and 0.4g of modified nano-graphene oxide, mix them and dissolve in 147.6g of DMF, stir at 150°C for 6 hours, then move into vacuum and statically Put defoaming, obtain polymer solution;

[0036] (4) Preparation of base film: After the water bath temperature rises to 80°C, the polymer solution in step (3) is subjected to liquid-solid phase conversion reaction on the non-woven fabric for 0.5min, and then the water bath temperature is lowered to 18°C ​​for full reaction After that, the preparation of the polymer base film is completed, and then the base film is soaked and stored in deionized water, and the film thickness is about 5.5mil;

[0037] (5) Weigh 35g m-phenylenediamine, 1gTEPA, 10g ethanol, 0.2g sodium hydroxide and mix them into 953.8g deionized water to dissolve completely to the amine aqueous phase solution; the base f...

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Abstract

The invention relates to the technical field of seawater desalination, in particular to a preparation method of a high-throughput nano-composite seawater desalination membrane. Oxidized nano-graphenemodified by triethyl phosphonoacetate (TEPA) and the TEPA can be used as reactants and added into a solution to participate in an interfacial polymerization reaction so as to form a polyamide functional layer; ethanol added into an aqueous phase solution improves the diffusion of m-phenylenediamine in the polyamide layer, so that the thickness of the membrane is increased, the membrane does not easily fall off, and the mechanical stability and salt rejection rate of the composite membrane are increased; however, the water flux decreases with the increment of the membrane thickness; meanwhile,the added TEPA enables the membrane to be looser due to having a chain structure, so that the problem that the salt rejection rate is reduced while the water flux is increased can be solved.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination membranes, and specifically refers to a preparation method of high-throughput nanocomposite seawater desalination membranes. Background technique [0002] Sea water accounts for 97% of the earth's water resources. Fresh water resources account for only 3%. The lack of fresh water resources has become a serious problem faced by human beings. Desalination of seawater to solve the shortage of freshwater resources has attracted more and more attention from scholars. Currently, seawater desalination methods include membrane separation, distillation, crystallization, and solvent extraction. [0003] The membrane separation method, which is often referred to as the reverse osmosis method, is currently the most widely used method for seawater desalination. According to the existing technology, when the permeability, water flux, pressure resistance, desalination rate and mechanical stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/56B01D71/68C02F1/44C02F103/08
CPCB01D61/027B01D67/0079B01D69/125B01D71/56B01D71/68C02F1/442C02F2103/08Y02A20/131
Inventor 刘仕忠许国杨梁松苗方俊
Owner VONTRON TECH CO LTD
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