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Method for preparing asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers

A technology of sulfonated polysulfones and high polymers, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of harsh treatment requirements and weak anti-oxidation ability, and achieve large water flux, Strong pressure tightness and precise hole diameter

Inactive Publication Date: 2011-02-23
天津森诺过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing composite nanofiltration membranes have weak anti-oxidation ability and strict pretreatment requirements, and provide a kind of production of asymmetric nanofiltration membranes blended with polyethersulfone and sulfonated polysulfone polymers The method, the nanofiltration membrane is an asymmetric nanofiltration membrane prepared by phase inversion, the rejection rate of sodium chloride and sodium sulfate reaches 20% to 95% under the operating pressure of 0.1 to 0.8MPa, and the rejection rate of sodium chloride and sodium sulfate to a relative molecular mass of 600 to 2000 The rejection rate of polyethylene glycol is 40%~99.9%, and the pure water flux of the membrane reaches 10~250L / (m 2 hbar) series of nanofiltration membranes

Method used

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  • Method for preparing asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers
  • Method for preparing asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers
  • Method for preparing asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 55g of dimethylacetamide into a 250mL three-neck flask, add 15g of acetone and mix well, then add 18g of polyethersulfone, 12g of sodium-type sulfonated polysulfone with a sulfonation degree of 10%, stir and dissolve at room temperature, and prepare The weight ratio of polyethersulfone to sulfonated polysulfone is 3:2, the total concentration of polymer is 30wt%, and the concentration of additive is 15wt%.

[0024] Control the humidity in the casting room at 40%, and the temperature in the casting room at 25°C. In the clean casting room, pour the fully defoamed casting solution on a smooth glass plate, using a scraper with a thickness of 0.25 mm stainless steel spatula scraped to form a film, quickly put it into a coagulation water bath with a temperature of 4°C, take it out after 24 hours of coagulation, wash it thoroughly with water, and store it in a preservation solution to obtain the nanofiltration membrane of the present invention.

[0025] According to the co...

Embodiment 2

[0027] The preparation conditions of the casting solution are the same as in Example 1, using 180g of dimethylacetamide, 45g of acetone, 45g of polyethersulfone, 30g of sodium-type sulfonated polysulfone with a sulfonation degree of 10%, polyethersulfone and sulfonated polysulfone The mass ratio is 3:2, the total concentration of polymer is 25wt%, and the mass concentration of additives is 15% casting solution formula.

[0028] The humidity in the casting chamber is controlled at 40%, the temperature in the casting chamber is controlled at 25°C, the prepared casting solution is poured into the feed tank, and a conventional hollow fiber manufacturing device is used. The conditions for spinning hollow fibers are: The core fluid flow rate was 10ml / min, the core fluid temperature was 25°C, and the coagulation bath temperature was 7°C. The spun hollow fiber nanofiltration membrane is immersed in a coagulation bath for 24 hours to take out the gel, fully washed with water, and store...

Embodiment 3

[0031]The preparation conditions of the casting solution are the same as in Example 1, using 55g of dimethylacetamide, 15g of acetone, 18g of polyethersulfone, 12g of hydrogen-type sulfonated polysulfone with a sulfonation degree of 10%, polyethersulfone and sulfonated polysulfone The mass ratio is 3:2, the total concentration of polymer is 30wt%, and the mass concentration of additives is 15% casting solution formula.

[0032] The film preparation conditions are the same as in Example 1.

[0033] According to the conventional membrane performance evaluation method, the pure water flux of the membrane is 50.5 L / (m 2 h), the rejection rate of 1g / L sodium sulfate is 76.5%, the rejection rate of 1g / L sodium chloride is 28.5%, the rejection rate of PEG800 (relative molecular mass is 800) is 95.6%, and the rejection rate of PEG600 (relative molecular weight The quality is 600) the rejection rate is 72.6%.

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Abstract

The invention discloses a method for preparing an asymmetric nanofiltration membrane by blending polyether sulfone and sulfonated polysulfone high polymers. A blending nanofiltration membrane with an asymmetric structure is prepared in one step by the nanofiltration membrane through a phase transformation method. The method comprises the following steps of: preparing casting membrane liquid, namely mixing the polyether sulfone, the sulfonated polysulfone high polymers, an additive and a solvent to prepare the casting membrane liquid; and forming a membrane by the phase transformation method, wherein the membrane comprises a flat membrane and a hollow fibrous membrane. The interception rate of the nanofiltration membrane to 0.5 to 1.5 g / L sodium chloride and 0.5 to 1.5 g / L sodium sulfate under the operating pressure of between 0.1 and 0.8 MPa is between 20 and 95 percent, the interception rate of the nanofiltration membrane to polyethylene glycol with the relative molecular mass of between 600 and 2,000 is between 40 and 99.9 percent, and the pure water flux of the membrane is between 10 and 250 L / (m2hbar). The asymmetric nanofiltration membrane of the invention has the advantages of high strength and toughness, high compactness resistance, chlorine resistance and high-temperature resistance, and can be applied to aspects of water treatment, wastewater treatment, material separation and the like.

Description

technical field [0001] The invention relates to a polymer special functional separation membrane and a preparation method thereof, in particular to a method for directly preparing a nanofiltration membrane by adopting a phase inversion method. Background technique [0002] Nanofiltration (NF, Nanofiltration) is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The rejection rate of salt is low, but the rejection rate of divalent salt is higher, and it has a higher rejection rate of small organic molecules with a relative molecular mass of 200-2000. Based on these characteristics, this type of membrane has attracted more and more attention from humans, and is widely used in the electronics industry, dye recovery, wastewater treatment, drinking water production, juice concentration, oil-water separation, etc. [0003] At present, most commercial nanofiltration membranes are composite nanofiltration membranes, that is, a thin layer of d...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D67/00B01D71/68
Inventor 陈玉海马冯李大维李然
Owner 天津森诺过滤技术有限公司
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