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Attapulgite-contaiing composite nanofiltration membrane and making method thereof

A technology of composite nanofiltration membrane and attapulgite, which is applied in the field of nanofiltration membrane, can solve the problems of unsatisfactory comprehensive performance of flux and salt interception rate, and achieve simple and easy experimental process, improved water flux and excellent reaction conditions. mild effect

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

[0008] The flux of the polyamide composite membrane prepared by the above reports has been improved, but the comprehensive performance of flux and salt rejection rate is not ideal

Method used

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  • Attapulgite-contaiing composite nanofiltration membrane and making method thereof
  • Attapulgite-contaiing composite nanofiltration membrane and making method thereof
  • Attapulgite-contaiing composite nanofiltration membrane and making method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Using a polysulfone porous support membrane, contact with a concentration of 5g / L piperazine (PIP) aqueous phase solution for about 30 seconds, wherein the piperazine aqueous phase solution contains 5g / L triethylamine (TEA), 1g / L decathene Sodium dialkyl sulfate (SDS), 0.005g / L attapulgite, and the polysulfone support membrane soaked by the piperazine aqueous phase solution were removed with a rubber roller to remove excess solution. Then this support film was contacted with n-hexane solution containing 1g / L trimesoyl chloride for 2 minutes; then the formed polyamide layer was air-dried, put into a vacuum oven at 40°C for 8 minutes, and then placed in a Rinse in water at 40° C. for 10 minutes to obtain a polypiperazine amide composite nanofiltration membrane containing attapulgite, and the prepared composite nanofiltration membrane is stored in deionized water. The hollow nanoscale pores of the attapulgite will allow more water molecules to pass through the composite na...

Embodiment 2

[0049] Using a polysulfone porous support membrane, contact with a concentration of 4g / L piperazine (PIP) aqueous phase solution for about 1 minute, wherein the piperazine aqueous phase solution contains 4g / L sodium carbonate (Na 2 CO 3 ), 1g / L sodium dodecylbenzenesulfonate (SBS), 0.01g / L attapulgite, and the polysulfone support membrane soaked by the piperazine aqueous phase solution was removed with a rubber roller to remove excess solution. Then this support membrane was contacted with a cyclohexane solution containing 0.5g / L isophthaloyl chloride for 1 minute; then the formed polyamide layer was air-dried and placed in a vacuum oven at 40°C for 10 minutes , and then rinsed in water at 40° C. for 10 minutes to obtain a polypiperazine amide composite nanofiltration membrane containing attapulgite, and the prepared composite nanofiltration membrane was stored in deionized water. The hollow nanoscale pores of the attapulgite will allow more water molecules to pass through th...

Embodiment 3

[0052] Use a polysulfone porous support membrane to contact with a piperazine (PIP) aqueous phase solution with a concentration of 5g / L for about 1 minute, wherein the piperazine aqueous phase solution contains 5g / L triethylamine (TEA), 1g / L Sodium dialkylbenzenesulfonate (SBS), 0.04g / L attapulgite, and the polysulfone support membrane soaked by the piperazine aqueous phase solution were used to remove excess solution with a rubber roller. Then this supporting film is contacted with ISOPAR E solvent oil (isoparaffin) solution containing 0.5g / L trimesoyl chloride for 50 seconds; then the formed polyamide layer is air-dried and placed in a vacuum at 40°C Keep in an oven for 8 minutes, then rinse in water at 40°C for 10 minutes to obtain a polypiperazine amide composite nanofiltration membrane containing attapulgite, and store the prepared composite nanofiltration membrane in deionized water. The hollow nanoscale pores of the attapulgite will allow more water molecules to pass th...

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Abstract

The invention discloses an attapulgite-contaiing composite nanofiltration membrane and a making method thereof. The nanofiltration membrane contains attapulgite with a length / diameter ratio of 20 or less, the attapulgite has a rod-shaped or fibrous structure, and has hollow nanometer tunnels, and the diameter of the attapulgite is 10-20nm. The method comprises the following steps: 1, a porous support membrane contacts with a water phase solution containing a reaction monomer and the attapulgite; 2, the porous support membrane infiltrated in the water phase solution is rolled to remove the superfluous water phase solution; 3, the porous support membrane obtained after the processing in step 2 contacts with an organic phase solution containing another reaction monomers to obtain a composite membrane; and 4, the composite membrane obtained in step 3 is dried, the dried composite membrane undergoes heat treatment, and the obtained composite membrane is washed by water to obtain the attapulgite-contaiing composite nanofiltration membrane. The making method greatly improves the nanofiltration flux of the composite nanofiltration membrane, maintains the high retention rate of the composite nanofiltration membrane, and substantially reduces the application running cost of the composite nanofiltration membrane.

Description

technical field [0001] The invention relates to the field of nanofiltration membranes, in particular to a composite nanofiltration membrane containing 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, solution decolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 刘轶群张超潘国元张杨郭敏
Owner CHINA PETROLEUM & CHEM CORP
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