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Method for preparing separation membrane by using small molecular monomer

A technology for separating membranes and small molecules, applied in semipermeable membrane separations, chemical instruments and methods, membranes, etc., can solve the problems of wasting solvents, water resources and time, prolonging the production cycle of materials, and taking a long time in the dissolution process. Waste of organic solvents, reduction of production and waste of energy resources, and the effect of shortening the production cycle

Pending Publication Date: 2022-03-04
TIANJIN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes not only prolong the production cycle of materials and increase manufacturing costs, but also consume a large amount of water and generate a large amount of waste water, which is easy to cause environmental pollution
[0004] In addition, in the traditional film-making process, the preparation of the casting solution needs to consume a large amount of organic solvents, and the dissolution process of the polymer is often accompanied by heating and the dissolution process takes a long time
[0005] Comparing the post-processing process of polymer material synthesis with the traditional membrane production method, a lot of solvent, water resources and time were wasted during the process

Method used

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  • Method for preparing separation membrane by using small molecular monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method of preparing (polyether sulfone) separation membrane is prepared using small molecular monomers, including the steps of:

[0039] (1) In an inert gas atmosphere, 2.0 mol of bisphenol S, 2.04 mol 4,4'-dichlorobenyl sulfone and potassium carbonate were added to the 5L reaction vessel, using Schlenk technology to remove oxygen in the reaction system. 3 l of cyclobutolane and 0.5 L toluene were added, and the system was heated to 140 ° C for 12 h, and the moisture in the system was removed; the system was heated to 210 ° C constant temperature reaction for 8 h, resulting in polyethersulfone having a number average molecular weight of 30000 da (where PDI = 1.52);

[0040] (2) Add a polyether sulfone to the online filter, filtration using a polytetrafluoroethylene film having a average pore diameter of 5 μm, removes salt particles to obtain a clear solution;

[0041] (3) 5% of the total mass of the die foundation (PVP-K50) is added to the clear solution and uniform, and ...

Embodiment 2

[0044] The method of preparing (polysulfone) separation membrane is prepared using small molecular monomers, and specifically includes the following steps:

[0045] (1) In an inert gas atmosphere, 4.0 mol of bisphenol A, 4.08 mol 4,4'-dichlorobenyl sulfone and potassium carbonate were added to a 10L reactor, and the oxygen in the reaction system was removed using Schlenk technology. 6 l N, N-dimethylacetamide and 1.5 L toluene were added, and the system was heated to 150 ° C for 12 h, removing moisture in the system; then heating the system to 165 ° C constant temperature reaction for 8 h, resulting in several average molecular weight The polysulfone (wherein PDI = 1.40) is 40000 da.

[0046] (2) Filtration of polysulfone is filtered from the chromatography in the chromatography column using 200 mesopolite soil, and the salt particles are removed, and the clear solution is obtained;

[0047] (3) Add 10%, polyethylene glycol (PEG2000) having a total molecular weight of 2000 Da, and...

Embodiment 3

[0050] The method of separating the film by the small molecular monomer (PSF-B-PEG block copolymer) separation membrane, specifically includes the steps of:

[0051] (1) In an inert gas atmosphere, 1.5 mol of bisphenol A, 1.5 mol 4, 4'-dichlorobenyl sulfone and 6 mol of potassium carbonate were added to the 5L reactor, and the oxygen in the reaction system was removed using Schlenk technology. 2.5 Ln, N-dimethylacetamide and 1 L toluene were added, first heated to heat the system to 150 ° C dehydration treatment for 12h, removing moisture in the system; heating the system heating the system to 165 ° C constant temperature reaction 8h; finally controlled the system At 165 ° C, a polyethylene glycol having a 26.4 g of a molecular weight of 400 dA was added, and the constant temperature reaction was prepared to obtain a PSF-B-PEG block copolymer having a PEG content of 13 wt% (wherein Mn = 42000 Da, PDI = 1.65);

[0052] (2) The PSF-B-PEG block copolymer was filtered according to a 3...

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Abstract

The invention discloses a method for preparing a separation membrane by using a small molecular monomer, which specifically comprises the following steps: (1) in an inert gas atmosphere, adding a monomer, a salt, a solvent and an entrainer into a reaction kettle, heating the system to 100-150 DEG C, dehydrating for 1-12 hours, and then removing the entrainer; heating the system to the temperature of 150-300 DEG C, and carrying out constant-temperature reaction for 0.5-20 hours; finally, the temperature of the system is controlled to be 100-300 DEG C, an end-capping reagent is added, and a constant-temperature reaction is conducted for 0.5-10 h; (2) filtering; (3) adding a pore-foaming agent and / or a diluting solvent and uniformly stirring; and (4) defoaming and then preparing the membrane. According to the method disclosed by the invention, the high-performance polymer membrane is directly prepared from a monomer, integration of membrane material synthesis and a membrane preparation process is realized, the production period is shortened, and the problems of organic solvent waste, energy consumption, environmental pollution and the like in a traditional process are solved.

Description

Technical field [0001] The present invention relates to the field of membrane material synthesis, and more particularly to a method of preparing a separation membrane using a small molecule monomer. Background technique [0002] Membrane separation technology is a new field that has made many disciplines such as materials science and process engineering science. As a highly efficient separation technology, the separation membrane technology is now widely used in chemical, environmentally friendly, electronics, light industry, textile, oil, food, medicine, biotechnology and energy engineering. Membrane separation techniques can be widely concerned in solving water resources crisis in the combination of continuous separation, low energy consumption, low energy consumption, and other separation processes. Most of the separation membranes currently used are organic films made of organic polymers. [0003] Common film forming materials are polysulfone, polyether sulfone, polyether eth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/06B01D69/08
CPCB01D67/0011B01D67/0013B01D69/02B01D69/06B01D69/08B01D2323/50
Inventor 胡云霞许兴民刘韬杨建华
Owner TIANJIN POLYTECHNIC UNIV
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