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Steam-assisted wet-process nanofiltration membrane preparation method and base membrane preparation method

A technology of nanofiltration membrane and wet method, which is applied in the field of preparation of separation membrane composite materials, can solve the problems of nanofiltration membranes that have not been reported, and achieve the effects of high repeatability, good water flux, and maintenance of water flux

Active Publication Date: 2017-08-18
TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there is no report on controlling the desalination effect of nanofiltration membranes by changing the gas phase atmosphere to control the degree of hydrolysis.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The invention discloses a steam-assisted wet nanofiltration membrane manufacturing method, which is realized according to the following steps:

[0033] (1) Preparation of ultrafiltration polysulfone base membrane

[0034] Evenly coat the polysulfone DMF solution with a solid content of 13% in terms of mass fraction on the non-woven fabric substrate, then quickly immerse the non-woven fabric in pure water, let it stand for 1min, take it out, and then put it in 70°C water 1min, take it out and put it in pure water for later use;

[0035] (2) Immerse the polysulfone ultrafiltration membrane in the m-phenylenediamine solution with a mass fraction of 2.5% for 3 minutes, remove the excess water phase with an air knife, and then use a slit coater to coat the surface with a mass fraction of 0.11%. ISOPAR G solution of trimesoyl chloride; coating thickness is 60 μm;

[0036] (3) The temperature of the above-mentioned coated polysulfone ultrafiltration membrane is 100°C, the ab...

Embodiment 2

[0038] The invention discloses a steam-assisted wet nanofiltration membrane manufacturing method, which is realized according to the following steps:

[0039] (1) Preparation of ultrafiltration polysulfone base membrane

[0040] Apply the polysulfone DMF solution with a solid content of 20% by mass fraction evenly on the non-woven fabric substrate, then quickly immerse the non-woven fabric in pure water, let it stand for 1min, take it out, and then put it in 70°C water 1min, take it out and put it in pure water for later use;

[0041] (2) Immerse the polysulfone ultrafiltration membrane in the m-phenylenediamine solution with a mass fraction of 2.5% for 3 minutes, remove the excess water phase with an air knife, and then use a slit coater to coat the surface with a mass fraction of 0.11%. ISOPAR G solution of trimesoyl chloride; coating thickness is 60 μm;

[0042] (3) The temperature of the above-mentioned coated polysulfone ultrafiltration membrane is 100°C, the absolute h...

Embodiment 3

[0044] The invention discloses a steam-assisted wet nanofiltration membrane manufacturing method, which is realized according to the following steps:

[0045] (1) Preparation of ultrafiltration polysulfone base membrane

[0046] Evenly coat the polysulfone DMF solution with a solid content of 13% in terms of mass fraction on the non-woven fabric substrate, then quickly immerse the non-woven fabric in pure water, let it stand for 1min, take it out, and then put it in 70°C water 1min, take it out and put it in pure water for later use;

[0047] (2) Immerse the polysulfone ultrafiltration membrane in the m-phenylenediamine solution with a mass fraction of 2.5% for 3 minutes, remove the excess water phase with an air knife, and then use a slit coater to coat the surface with a mass fraction of 0.11%. ISOPAR G solution of trimesoyl chloride; coating thickness is 60 μm;

[0048] (3) Send the above-mentioned coated polysulfone ultrafiltration membrane into the air at a temperature ...

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Abstract

The invention relates to the technical field of preparation of separating membrane composite materials and particularly relates to a steam-assisted wet-process nanofiltration membrane preparation method and a base membrane preparation method. The steam-assisted wet-process nanofiltration membrane preparation method is characterized in that the hydrolyzation degree of trimesoyl chloride is controlled by controlling a heating temperature and a concentration of water steam, and therefore, the desalinization rate of a nanofiltration membrane product is controlled. The steam-assisted wet-process nanofiltration membrane preparation method has the beneficial effects that a nanofiltration membrane synthesis method capable of controllably adjusting the desalinization rate of the nanofiltration membrane is provided, the operation is simple, the cost is low, and the repeatability of the predetermined desalinization rate of the nanofiltration membrane is high; and by utilizing water steam in a drying process of an organic isoparaffin solvent, a polysulfone-base membrane can still in a moist state when the drying of organic isoparaffin is guaranteed, so that the water flux can be well maintained.

Description

technical field [0001] The invention relates to the technical field of preparation of separation membrane composite materials, in particular to a method for preparing a steam-assisted wet nanofiltration membrane and a method for preparing a bottom membrane. Background technique [0002] The synthesis of artificial semipermeable membranes has laid a technical foundation for reverse osmosis membrane processes such as membrane seawater desalination and brackish water desalination, and has promoted the development of membrane water treatment technology. [0003] Commercial nanofiltration membranes currently on the market are basically synthesized by interfacial polymerization. Specifically, the on-line synthesis of polymers is carried out by using m-phenylenediamine or piperazine as the water phase monomer and trimesoyl chloride as the oil phase monomer. [0004] The synthesized polymer is directly attached to the polysulfone ultrafiltration base membrane at the bottom in the f...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D67/00
CPCB01D67/0002B01D71/68
Inventor 陈亦力夏建中彭文娟林勇李锁定
Owner TIANJIN BISHUIYUAN MEMBRANE MATERIAL CO LTD
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