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Preparation method of chlorine-resistant composite ceramic nano-filtration membrane

A technology of composite ceramics and nanofiltration membranes, applied in the field of water purification, can solve problems such as unusable, damaged nanofiltration membranes, and degradation of membrane performance, and achieve the effect of ensuring tolerance and high retention performance

Inactive Publication Date: 2018-11-09
北京享云智汇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In actual use, in order to achieve the effect of cleaning the water source and reducing membrane biofouling, the front end of the membrane separation device will use sodium hypochlorite to sterilize the influent water, and the active chlorine introduced will cause irreversible damage to the polyarylamide nanofiltration membrane structure. The damage of the film makes the performance of the membrane decline rapidly and cannot continue to be used.
Therefore, in order to prolong the service life of the nanofiltration membrane, the influent water needs to be dechlorinated after disinfection to meet the requirement that the residual chlorine content in the influent water is less than 0.1ppm. Be careful and make the residual active chlorine too high to damage the risk of nanofiltration membrane

Method used

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  • Preparation method of chlorine-resistant composite ceramic nano-filtration membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] S1. Preparation of ceramic membrane:

[0018] 1) Each raw material is weighed according to the composition of the following parts by weight: 120 parts of alumina powder, 40 parts of silicon carbide, 300 parts of boron nitride, 70 parts of silicon dioxide, 10 parts of antioxidant, and 30 parts of nano-titanium oxide additive;

[0019] 2) adding alumina powder, silicon carbide, boron nitride and silicon dioxide into a ball mill, and performing dry mixing and ball milling for 15 hours to obtain a mixed material;

[0020] 3) Mix and grind the antioxidant and additives to 200 mesh, add the mixture obtained in step 2) and mix evenly, put it in a high-temperature furnace, heat to 1500°C for 4 hours in a vacuum and dragging atmosphere, and sinter the to room temperature.

[0021] S2. Chlorine-resistant composite ceramic nanofiltration membrane:

[0022] First, the ceramic membrane prepared in step S1 is immersed in an aqueous solution containing 0.5wt% piperazine, and after r...

Embodiment 2

[0024] S1. Preparation of ceramic membrane:

[0025] 1) Each raw material is weighed according to the composition of the following parts by weight: 130 parts of alumina powder, 30 parts of silicon carbide, 30 parts of boron nitride, 80 parts of silicon dioxide, 20 parts of antioxidant, and 10 parts of nano-zinc oxide additive;

[0026] 2) adding alumina powder, silicon carbide, boron nitride and silicon dioxide into a ball mill, and performing dry mixing and ball milling for 15 hours to obtain a mixed material;

[0027] 3) Mix and grind the antioxidant and additives to 100 mesh, add the mixture obtained in step 2) and mix evenly, put it in a high-temperature furnace, heat to 1500°C for 4 hours in a vacuum and dragging atmosphere, and sinter the to room temperature.

[0028] S2. Preparation of chlorine-resistant composite ceramic nanofiltration membrane:

[0029] First, the ceramic membrane prepared in step S1 is immersed in an aqueous solution containing 0.5wt% piperazine, a...

Embodiment 3

[0031] S1. Preparation of ceramic membrane:

[0032] 1) Weigh each raw material according to the composition of the following parts by weight: 150 parts of alumina powder, 35 parts of silicon carbide, 33 parts of boron nitride, 77 parts of silicon dioxide, 13 parts of antioxidant, 10 parts of nano-titanium oxide additive, nano-oxidized 10 parts of zinc additive;

[0033] 2) adding alumina powder, silicon carbide, boron nitride and silicon dioxide into a ball mill, and performing dry mixing and ball milling for 10-15 hours to obtain a mixed material;

[0034] 3) Mix and grind the antioxidant and additives to 100-200 mesh, and then add the mixture obtained in step 2) to dry it out. After mixing evenly, put it into a high-temperature furnace and heat it to 700-1500°C in a vacuum and dragging atmosphere for sintering 2-4 hours, it will come to room temperature.

[0035] S2. Preparation of chlorine-resistant composite ceramic nanofiltration membrane:

[0036] First, the ceramic ...

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Abstract

The invention provides a preparation method of a chlorine-resistant composite ceramic nano-filtration membrane. The ceramic nano-filtration membrane with good chlorine resistance is prepared by selecting traditional piperazine / trimesoyl chloride interfacial polymerization; reaction is carried out by utilizing an interface active group and a hydroxyl-containing macromolecular membrane material withthe good chlorine resistance to form an ester group with the good chlorine resistance; the macromolecular membrane material with the good chlorine resistance is introduced so that the tolerance performance of the nano-filtration membrane on sodium hypochlorite is ensured, and the high-interception performance on inorganic salt ions is obtained.

Description

technical field [0001] The invention relates to the technical field of water purification, in particular to a preparation method of a chlorine-resistant composite ceramic nanofiltration membrane. Background technique [0002] Nanofiltration is a pressure-driven membrane separation technology whose performance is between ultrafiltration and reverse osmosis. Its research began in the late 1970s. Different from ultrafiltration and reverse osmosis, the separation mechanism of nanofiltration is based on the charging effect in addition to the nano-scale microporous sieving effect. Repels the ions in the solution with the same charge as the membrane, so it has a high selective separation. The preparation methods of nanofiltration membranes include phase inversion method, interfacial polymerization method, layer-by-layer assembly method, chemical cross-linking method, etc. At present, the mainstream nanofiltration membranes on the market are basically prepared by interfacial polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D67/00C02F1/44C02F101/10
CPCB01D61/027B01D67/0079B01D69/02B01D69/125B01D2325/30C02F1/442C02F2101/10
Inventor 于文祥
Owner 北京享云智汇科技有限公司
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