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Composite nanofiltration flat sheet membrane

A flat membrane and nanofiltration technology, applied in the field of membrane separation, can solve the problems of weak hydrophilicity and low water flux, and achieve the effects of easy production and control, increased water flux, and increased retention rate

Inactive Publication Date: 2013-07-10
SYNDER TAIZHOU MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the shortcomings of weak hydrophilicity and low water flux in the actual use of existing composite nanofiltration membranes, and provide a composite nanofiltration flat membrane, which not only Has strong interception and hydrophilicity, and simple structure, easy to manufacture

Method used

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  • Composite nanofiltration flat sheet membrane

Examples

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Effect test

Embodiment 1

[0013] Example 1: Use polysulfone material as the support membrane, put it into 0.1% sodium polystyrene sulfonate aqueous solution for about 30 seconds, squeeze with a rubber roller to remove excess solution, and put it in an oven at 45° C. for 5 minutes. Soak the treated support membrane in 1% piperazine solution, squeeze the excess solution with a rubber roller again, and then contact the support membrane with 0.1% tribenzoyl chloride organic solvent for 10 seconds, and then place it in a 65°C oven Keep in the middle for 10 minutes, and finally obtain the nanofiltration flat membrane with sodium polystyrene sulfonate coating. The rejection rate and flux of the membrane were tested with 2000ppm magnesium sulfate aqueous solution, and the test results under the test condition of pressure 0.8MPa were: the rejection rate was 99.44%, and the water flux was 44.23LMH.

Embodiment 2

[0014] Example 2: Use polyethersulfone material as a support membrane, put it into 0.75% sodium polystyrene sulfonate aqueous solution for about 30 seconds, squeeze with a rubber roller to remove excess solution, and put it in an oven at 50°C for 5 minutes . Soak the treated support membrane in 1.5% piperazine solution, squeeze the excess solution with a rubber roller again, then contact the support membrane with 0.2% trimetribenzoyl chloride organic solvent for 30 seconds, and then place it in a 65°C oven Keep in the middle for 15 minutes, and finally obtain the nanofiltration flat membrane with sodium polystyrene sulfonate coating. The rejection rate and flux of the membrane were tested with 2000ppm magnesium sulfate aqueous solution, and the test results under the test condition of pressure 0.8MPa were: the rejection rate was 98.36%, and the water flux was 68.21LMH.

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Abstract

The invention discloses a composite nanofiltration flat sheet membrane, comprising a polysulfone or polyethersulfone base membrane provided with a sodium polystyrene sulfonate coating. As a further improvement, the sodium polystyrene sulfonate coating is distributed on everywhere of the base membrane surface and in the inner holes. The composite nanofiltration flat sheet membrane is characterized in that it not only has interception and hydrophilic property but also has the advantages of simple structure and easy manufacture, and can be widely applied to various fields.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a nanofiltration membrane technology, in particular to a composite nanofiltration membrane production technology. Background technique [0002] Nanofiltration membrane is a new type of separation membrane developed in recent years. Most nanofiltration membranes are charged membranes, and the separation behavior is related to its chargeability, charge state and interaction of solutes. The unique separation characteristics make nanofiltration membranes a hot spot in current research. The related preparation technology has been developed rapidly, and the application fields have been continuously expanded. It has been widely used in food, chemical, pharmaceutical, water treatment and other fields. [0003] At present, the nanofiltration membrane preparation methods used at home and abroad mainly include interfacial polymerization method, phase inversion method, surface gra...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/68
Inventor 何铁峰王永强
Owner SYNDER TAIZHOU MEMBRANE TECH CO LTD