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Loose nanofiltration membrane and preparation method and application thereof

A nanofiltration membrane and loose technology, which is applied in the field of membrane separation, can solve the problems of low water flux and long preparation time of composite nanofiltration membranes, and achieve the effects of short time consumption, stable membrane performance and stable performance

Active Publication Date: 2020-07-28
GUANGDONG ESQUEL TEXTILES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent application with the application number 201810535831.7 discloses a composite nanofiltration in which the basement membrane is immersed in an aqueous solution of tannic acid, and metal titanium salt is added to form a tannic acid-titanium cross-linked functional surface layer on the basement membrane in situ. Membrane, the prepared composite nanofiltration membrane has low water flux and also has the problem of long preparation time

Method used

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  • Loose nanofiltration membrane and preparation method and application thereof
  • Loose nanofiltration membrane and preparation method and application thereof
  • Loose nanofiltration membrane and preparation method and application thereof

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preparation example Construction

[0044] The embodiment of the present invention proposes a method for preparing a loose nanofiltration membrane applied to the reuse of printing and dyeing wastewater, comprising the following steps:

[0045] S1. First, mix a certain amount of ferric chloride with the organic solvent -N,N'-dimethylformamide, and shake until uniform before use. Then weigh a certain amount of polyethersulfone particles and add to the above solution, heat and stir to obtain a uniform and stable casting solution.

[0046] S2. Configure a certain concentration of tannic acid aqueous solution as the external coagulation bath, paste the non-woven fabric on the glass plate with transparent glue, pour the casting solution evenly on the edge of the glass plate, use a scraper to scrape the film, and make the casting solution in the absence of Forms an even coating on the spun fabric. Thereafter, the glass plate and the cast film liquid layer are immersed in the external coagulation bath for a period of t...

Embodiment 1

[0058] First, mix a certain mass of ferric chloride with the organic solvent-N,N'-dimethylformamide, wherein the mass fraction of ferric chloride is 0.5wt.%, shake until uniform, and then weigh a certain amount of poly Ethersulfone particles were added to the above solution, the mass fraction of polyethersulfone in the casting solution was 18wt.%, and heated and stirred at 45°C to obtain a uniform and stable casting solution. An aqueous solution of tannic acid (adjusted to pH 5 with sodium hydroxide and sulfuric acid) with a mass fraction of 1.0 wt.% was used as an external coagulation bath. Stick the non-woven fabric on the glass plate with transparent glue, pour the casting solution evenly on the edge of the glass plate, scrape the film with a 200 μm scraper, and let the casting solution form a uniform coating on the non-woven fabric. Thereafter, the glass plate together with the cast film layer was immersed in the external coagulation bath for 10 minutes. Take out the base...

Embodiment 2

[0063] The difference between this example and Example 1 is that the mass fraction of polyethersulfone in the casting solution is 21wt.%. Others are the same as in Example 1.

[0064] Use pure water as the raw material liquid, run it at 3.0bar for 1 hour, and obtain the water flux of the prepared loose nanofiltration membrane, which is 22.4LMH / bar. After that, change the raw material liquid into 200ppm reactive dye Ec Red H-E7B H / C aqueous solution was used as the feed liquid, and the test was carried out continuously for 8 hours at a test temperature of 25°C and a pressure of 2.0 bar, and the changes of membrane flux and dye retention rate during the test were investigated. see results Figure 6 . Depend on Figure 6 It can be seen that the pure water flux of the loose nanofiltration membrane prepared in Example 2 has decreased compared to Example 1, only 22.4LMH / bar, and the rejection rate of reactive dye Ec Red H-E7BH / C was tested in 8 hours. Both remain above 99.4%, w...

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Abstract

The invention provides a loose nanofiltration membrane and a preparation method and application thereof. The preparation method comprises the following steps: mixing an inorganic metal salt with an organic solvent, adding a polymer, carrying out magnetic stirring at 25-75 DEG C for 24 hours, carrying out standing overnight, and performing defoaming to obtain a membrane casting solution; enabling the membrane casting solution to form a uniform membrane casting solution coating through membrane scraping; immersing the membrane casting solution coating in an aqueous tannic acid solution to obtaina base membrane; and removing the residual solution on the surface of the base membrane, and contacting the organic solution of trimesoyl chloride with the upper surface of the base membrane to obtain the loose nanofiltration membrane. The loose nanofiltration membrane obtained by the preparation method has good permeability to inorganic salt, high rejection rate to organic dyes and stable performance.

Description

technical field [0001] The invention relates to a preparation method of a filter membrane, in particular to a preparation method of a loose nanofiltration membrane, and belongs to the technical field of membrane separation. Background technique [0002] With the development of the economy and the improvement of people's living standards, colorful commodities enrich people's lives everywhere. Dyes are widely used as colorants in textile, printing and dyeing, leather and food industries. Taking the printing and dyeing textile production process as an example, in order to improve the dyeing rate of fabrics, a large amount of inorganic salts such as sodium sulfate (mainly composed of sodium sulfate) and sodium chloride will be used as dyeing accelerators, which will inevitably bring about the generation of salty organic wastewater. Produced in large quantities. The direct discharge of salty wastewater will cause serious pollution of the water body and cause a great waste of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/42B01D71/34B01D71/02B01D67/00B01D61/02C02F1/44C02F101/30
CPCB01D71/02B01D67/0079B01D71/34B01D71/68B01D71/42B01D61/027C02F1/442C02F2101/308
Inventor 张旋罗亚雄杜希柯岩左小新张玉高
Owner GUANGDONG ESQUEL TEXTILES CO LTD
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