Composite nanofiltration membrane containing organically modified attapulgite and preparation method thereof

A technology of composite nanofiltration membrane and attapulgite, which is applied in the field of composite nanofiltration membrane containing organically modified attapulgite and its preparation, can solve the problem of large specific surface area of ​​attapulgite, poor affinity of organic polymers, surface High activity and other problems, to achieve the effect of mild reaction conditions, improved performance, and simple experimental process

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although attapulgite is a natural nanomaterial, it often cannot exert its advantages as a nanomaterial in the application process, mainly because attapulgite has a large specific surface area, high surface activity, and is easy to agglomerate, and the surface contains polar Hydroxyl, so it has poor affinity with organic polymers, only by improving its hydrophobicity, can it be effectively applied in some fields

Method used

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  • Composite nanofiltration membrane containing organically modified attapulgite and preparation method thereof
  • Composite nanofiltration membrane containing organically modified attapulgite and preparation method thereof
  • Composite nanofiltration membrane containing organically modified attapulgite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The specific purification steps of the attapulgite used in the present embodiment are as follows:

[0063] Prepare an attapulgite aqueous solution with a mass concentration of 10%, add a dispersant sodium hexametaphosphate whose mass is 10% of the attapulgite mass, mechanically stir for 30 minutes, ultrasonically treat for 30 minutes, and centrifuge at 2000r / min ; Discard the supernatant and dry in an oven at 80°C;

[0064] The concrete steps of the attapulgite organic modification after purification in the present embodiment are as follows:

[0065] Prepare a purified attapulgite aqueous solution with a mass concentration of 10%, add hexadecyltrimethylammonium bromide powder whose mass is 20% of that of attapulgite; and react with magnetic stirring for 2 hours at 70°C; After the above reaction solution was centrifuged (2000r / min) for a certain period of time, the supernatant was discarded; the modified attapulgite was dried in an oven at 80°C, cooled and then ground w...

Embodiment 2

[0069] The purification and organic modification steps of the attapulgite used in this example are the same as in Example 1.

[0070] Use a polysulfone porous support membrane with a molecular weight cut-off of 30,000 to 50,000, contact with a piperazine (PIP) aqueous phase solution with a concentration of 5g / L for about 30 seconds, wherein the piperazine aqueous phase solution contains 5g / L triethylamine (TEA ), 4g / L sodium dodecyl sulfate (SDS), the polysulfone support membrane soaked by the piperazine aqueous phase solution was removed with a rubber roller to remove excess solution. Then this supporting membrane is contacted with the n-hexane solution of trimesoyl chloride of 1g / L with concentration for 2 minutes, wherein the organically modified attapulgite of 0.001g / L is contained in the organic phase solution of trimesoyl chloride; The polyamide layer was dried in the air, placed in a 40°C oven for 8 minutes, and then rinsed in 40°C water for 10 minutes to obtain a polyp...

Embodiment 3

[0073] The purification and organic modification steps of the attapulgite used in this example are the same as in Example 1.

[0074] Use a polysulfone porous support membrane with a molecular weight cut-off of 30,000 to 50,000 to contact with a piperazine (PIP) aqueous phase solution with a concentration of 5 g / L for about 1 minute, wherein the piperazine aqueous phase solution contains 5 g / L of sodium carbonate (Na 2 CO 3 ), 1g / L sodium dodecyl sulfate (SDS), and the polysulfone support membrane soaked by the piperazine aqueous phase solution was removed with a rubber roller to remove excess solution. Then this supporting membrane is contacted with the cyclohexane solution of the isophthaloyl chloride of 1g / L with concentration for 1 minute, wherein the organically modified attapulgite of 0.01g / L is contained in the trimesoyl chloride organic phase solution; then Dry the formed polyamide layer in the air, place it in an oven at 40°C for 10 minutes, and then rinse it in wate...

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Abstract

The invention discloses a composite nanofiltration membrane containing organically modified attapulgite and a preparation method thereof. The nanofiltration membrane is prepared by: (1) contacting a porous polysulfone supporting layer and a water phase solution containing reaction monomers; (2) rolling the porous polysulfone supporting layer having been dipped in the water phase by a rubber roller to remove the excess water phase solution; (3) contacting the porous polysulfone supporting layer treated in the step (2) and an organic phase solution containing reaction monomers and the purified and organically modified attapulgite to obtain a composite membrane; and (4) drying the composite membrane, allowing the composite membrane to stand, and washing the composite membrane with water to obtain the composite nanofiltration membrane. The purified attapulgite modified with a quaternary ammonium salt is introduced in an interfacial polymerization process, thus enhancing permeability of the composite nanofiltration membrane.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a composite nanofiltration membrane containing organically modified attapulgite and a preparation method thereof. Background technique [0002] As a new type of separation technology, membrane separation has the advantages of low energy consumption, high separation efficiency, and environmental protection compared with traditional separation technologies such as distillation and rectification. Nanofiltration membrane separation technology is a new type of pressure-driven membrane separation technology between reverse osmosis and ultrafiltration. Its rejection rate for divalent or multivalent ions and organic molecules with a molecular weight greater than 200 is generally greater than 90%, which can achieve selective separation of different substances. Therefore, relying on its unique separation characteristics, nanofiltration membranes have been widely used in water softening,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/82B01D67/00B01D71/02C08J9/36C08J7/12
Inventor 刘轶群张超潘国元张杨郭敏严昊
Owner CHINA PETROLEUM & CHEM CORP
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