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Preparation method of polyethersulfone-based composite positive permeable membrane

A forward osmosis membrane, polyethersulfone technology, applied in the field of membrane separation, can solve the problems of low permeation flux, internal concentration polarization, low porosity, etc., achieve high permeation flux and retention rate, and reduce internal concentration difference Polarized, low-cost effects

Inactive Publication Date: 2016-07-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low permeation flux, poor hydrophilicity, low porosity, or serious internal concentration polarization in the existing forward osmosis membranes, and to invent a membrane with simple preparation process and high porosity. Composite forward osmosis membrane with high permeation flux

Method used

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  • Preparation method of polyethersulfone-based composite positive permeable membrane
  • Preparation method of polyethersulfone-based composite positive permeable membrane
  • Preparation method of polyethersulfone-based composite positive permeable membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In the first step, dry polyethersulfone and additive polyethylene glycol in a vacuum oven at 50°C for 24 hours, add 17g polyethersulfone and 12g polyethylene glycol to 71g solvent, and the solvent is N,N-dimethyl A mixture of acetamide and diethylene glycol with a mass ratio of 1:1; then put the prepared mixture in an oil bath at 60°C and stir for 6 hours. When the solution is uniform and transparent, stop stirring and let it stand for 8 hours for defoaming. , to obtain the casting solution;

[0038] In the second step, evenly pour the casting solution on the top of the glass plate at 10°C, and then use a scraper to scrape a certain thickness of polymer solution from top to bottom;

[0039] In the third step, the glass plate is left to stand for 5 seconds to cause thermal phase separation (solid-liquid phase separation) of the casting solution;

[0040] The fourth step is to immerse the glass plate coated with the polymer solution in deionized water for 24 hours to ful...

Embodiment 2

[0045] Adjust the solid-liquid phase separation time in Step 3 in Example 1 to 10 s, and the remaining conditions are the same as in Example 1. The prepared composite forward osmosis membrane has a permeation flux of 31.6L / m 2 h, the reverse salt flux is 14.4g / m 2 h.

Embodiment 3

[0047]Adjust the mass of polyethersulfone in Step 1 in Example 1 to 18 g, and the rest of the conditions are the same as in Example 1. The prepared composite forward osmosis membrane has a permeation flux of 22.6L / m 2 h, the reverse salt flux is 12.0g / m 2 h.

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Abstract

The invention discloses a preparation method of a polyethersulfone-based positive permeable membrane, and relates to the field of membrane separation. The method comprises the following steps: dissolving polyethersulfone and polyethylene glycol in a solvent; coating membrane casting fluid on a low-temperature glass plate; leaving the membrane casting fluid to stand on the glass plate, and enabling the membrane casting fluid to generate thermally induced phase separation; finally immersing the glass plate into water, and enabling the solvent to be removed. The prepared base membrane is prepared into a polyamide separating layer by an interfacial polymerization method, the base membrane is sequentially immersed into an m-phenylene diamine-aqueous solution of which the percentage by weight is 1.0-4.0wt% and a trimesoyl chloride-hexane solution of which the percentage by weight is 0.05-0.2wt%, and finally heat treatment is performed at 60 DEG C for 300 s so that the polyethersulfone-based composite positive permeable membrane is obtained. The polyethersulfone-based composite positive permeable membrane prepared by the method disclosed by the invention has high hydrophilicity and porosity, and besides, a fault surface adopts a perforated finger shaped structure. Tests on properties of the composite membrane indicate that the composite membrane prepared by the method disclosed by the invention has a high permeation flux and a high interception rate.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a preparation method of a composite forward osmosis membrane using polyethersulfone as a base membrane. technical background [0002] With the rapid increase of population, water shortage and energy crisis have seriously hindered people's life and economic development. Facing the problem of increasingly scarce water resources, water treatment technology has developed rapidly in recent years. Among them, membrane water treatment technology, especially seawater desalination technology, has become an important way to solve the shortage of water resources. In membrane water treatment, reverse osmosis has always been the main way to desalinate seawater, but the operating pressure of reverse osmosis is high, and the membrane is easily polluted under high pressure conditions. The development of new membrane technology combined with reverse osmosis has become a solution to the shortage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/56B01D69/12B01D67/00
CPCB01D67/0006B01D67/0011B01D67/0013B01D69/125B01D71/56B01D71/68B01D2323/08B01D2325/025B01D2325/24B01D2325/36
Inventor 王湛杨丽彬张景隆刘利萍
Owner BEIJING UNIV OF TECH
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