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High-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane and preparation method thereof

A nanofiltration membrane and high-throughput technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as scaling and failure to solve inorganic salts, reduce surface tension, improve resistance to inorganic salts, etc. Scalability, effect of changing aggregation state

Pending Publication Date: 2022-01-11
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it fails to solve the problem of inorganic salt fouling on the membrane surface

Method used

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  • High-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. A method for preparing a high-throughput inorganic fouling-resistant medium desalination nanofiltration membrane, comprising the following steps:

[0030] (1) Prepare polymer solution: add 18wt% polysulfone (PS) and 4wt% ether to 78wt% N,N-dimethylformamide (DMF), stir at 150°C for 6h to dissolve, and then carry out Vacuum standing for defoaming for 10 h to obtain a polymer solution.

[0031] (2) Preparation of a porous support layer: the polymer solution obtained in step (1) is scraped on a film scraping system, and a base film is formed on a non-woven fabric by a liquid-solid phase conversion method, which is a porous support layer. Preserve in deionized water to obtain a polymer base film;

[0032]Further, the phase inversion time is controlled to be 0.5 min, the temperature of the water bath is 18° C., the temperature of the thermal curing water bath is 80° C., and the film thickness is controlled at 5.2 mil.

[0033] (3) Preparation of amine aqueous phase solu...

Embodiment 2

[0037] 1. A method for preparing a high-throughput inorganic fouling-resistant medium desalination nanofiltration membrane, comprising the following steps:

[0038] (1) Preparation of polymer solution: add 16wt% polysulfone (PS) and 6wt% ether to 78wt% N,N-dimethylformamide (DMF), stir at 150°C for 6h to dissolve, and then carry out Vacuum standing for defoaming for 10 h to obtain a polymer solution.

[0039] (2) Preparation of a porous support layer: the polymer solution obtained in step (1) is scraped on a film scraping system, and a base film is formed on a non-woven fabric by a liquid-solid phase conversion method, which is a porous support layer. Preserve in deionized water to obtain a polymer base film;

[0040] Further, the phase inversion time is controlled to be 1 min, the temperature of the water bath is 15° C., the temperature of the thermal curing water bath is 75° C., and the film thickness is controlled at 5.8 mil.

[0041] (3) Preparation of amine aqueous phas...

Embodiment 3

[0045] 1. A method for preparing a high-throughput inorganic fouling-resistant medium desalination nanofiltration membrane, comprising the following steps:

[0046] (1) Prepare polymer solution: add 20wt% polysulfone (PS) and 3wt% ether to 77wt% N,N-dimethylformamide (DMF), stir at 150°C for 6h to dissolve, and then carry out Vacuum standing for defoaming for 10 h to obtain a polymer solution.

[0047] (2) Preparation of a porous support layer: the polymer solution obtained in step (1) is scraped on a film scraping system, and a base film is formed on a non-woven fabric by a liquid-solid phase conversion method, which is a porous support layer. Preserve in deionized water to obtain a polymer base film;

[0048] Further, the phase inversion time is controlled to be 1 min, the temperature of the water bath is 20° C., the temperature of the thermal curing water bath is 85° C., and the film thickness is controlled at 6.0 mil.

[0049] (3) Preparation of amine aqueous phase solut...

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Abstract

The invention belongs to the technical field of preparation of nanofiltration membrane materials, and particularly relates to a high-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane and a preparation method thereof. An amine water-phase solution, an oil-phase solution and a dimethylformamide solution are adopted to treat a polymer-based membrane, and through the special component proportion in the amine water-phase solution and the oil-phase solution, compared with a traditional nanofiltration membrane and a reverse osmosis membrane, the prepared high-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane has higher water yield under the same operation pressure, can moderately desalt, and has improved inorganic scaling resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanofiltration membrane materials, and in particular relates to a high-throughput inorganic fouling-resistant medium desalination nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology refers to the technology that achieves selective separation of a mixture of molecules with different particle sizes at the molecular level when passing through a semi-permeable membrane. The membrane wall is covered with small holes, which can be divided into microfiltration membrane (MF), Ultrafiltration membrane (UF), nanofiltration membrane (NF), reverse osmosis membrane (RO), etc. [0003] Nanofiltration membranes were first used in the drinking water treatment industry, mainly for water softening. The rejection rate of NF membrane to divalent and multivalent ions can reach more than 90%, and the rejection rate to monovalent salt is 10%-90%....

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/76B01D69/10B01D67/00
CPCB01D71/68B01D69/10B01D61/027B01D67/0011B01D71/76Y02A20/131
Inventor 刘仕忠梁松苗胡利杰宋鹏许国杨金焱吴宗策
Owner VONTRON TECH CO LTD
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