Method for preparing water treatment filtering membrane

A technology of water treatment and membrane filtration, which is applied in water/sewage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc. It can solve the problem of poor stability of nanofiltration functional layer and no large-scale mature products , low water production and other issues, to achieve uniform and stable nanofiltration functional layer, to achieve continuous industrial production, and to achieve the effect of wide application prospects

Inactive Publication Date: 2017-12-08
深圳市树立水处理设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with foreign countries, my country's nanofiltration membranes have low removal rates of sodium chloride and magnesium sulfate, low water production, poor stability of nanofiltration functional layers, and continuous industrial production cannot be realized. initial stage
There are currently no mature products in large quantities

Method used

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  • Method for preparing water treatment filtering membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing a water treatment membrane, through the preparation of a hollow fiber membrane, the preparation of a CMC solution and the pressing and molding steps, the preparation of a water treatment membrane is completed; the specific steps are as follows:

[0025] (1) Preparation of hollow fiber membrane:

[0026] a. Preparation of nano-silica sol: Mix tetraethoxysilane, titanium dioxide particles, absolute ethanol and deionized water into a beaker, then stir in a water bath at 70°C for 20 minutes, then add dropwise ammonia water with a mass fraction of 15% 0.1g, prepared nano-silica sol after keeping it in a water bath at 50°C for 4 hours, the mixing ratio of tetraethoxysilane, titanium dioxide particles, absolute ethanol and deionized water is 3:1:8:1;

[0027] b. Preparation of PVA aqueous solution: wash, dry and weigh a 1000ml beaker to obtain mass m1, then add 760g deionized water into the beaker, add it in a 97°C constant temperature water bath, stir, ...

Embodiment 2

[0033] A method for preparing a water treatment membrane, through the preparation of a hollow fiber membrane, the preparation of a CMC solution and the pressing and molding steps, the preparation of a water treatment membrane is completed; the specific steps are as follows:

[0034] (1) Preparation of hollow fiber membrane:

[0035] a. Preparation of nano-silica sol: Mix tetraethoxysilane, titanium dioxide particles, absolute ethanol and deionized water into a beaker, then stir in a 70°C water bath for 25 minutes, and then add dropwise ammonia water with a mass fraction of 15% 0.4g, prepared nano-silica sol after keeping it in a water bath at 50°C for 4 hours, the mixing ratio of tetraethoxysilane, titanium dioxide particles, absolute ethanol and deionized water is 5:1:10:2;

[0036] b. Preparation of PVA aqueous solution: wash, dry and weigh a 1000ml beaker to obtain mass m1, then add 760g deionized water into the beaker, add it in a 97°C constant temperature water bath, stir...

Embodiment 3

[0042] A method for preparing a water treatment membrane, through the preparation of a hollow fiber membrane, the preparation of a CMC solution and the pressing and molding steps, the preparation of a water treatment membrane is completed; the specific steps are as follows:

[0043] (1) Preparation of hollow fiber membrane:

[0044] a. Preparation of nano-silica sol: Mix tetraethoxysilane, titanium dioxide particles, absolute ethanol and deionized water into a beaker, then stir in a water bath at 70°C for 23 minutes, and then add dropwise ammonia water with a mass fraction of 15% 0.25g, prepared nano-silica sol after keeping it in a water bath at 50°C for 4 hours, the mixing ratio of tetraethoxysilane, titanium dioxide particles, absolute ethanol and deionized water is 4:1:9:1.5;

[0045] b. Preparation of PVA aqueous solution: wash, dry and weigh a 1000ml beaker to obtain mass m1, then add 760g deionized water into the beaker, add it in a 97°C constant temperature water bath,...

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Abstract

The invention discloses a method for preparing a water treatment filtering membrane. The method is characterized by comprising the following steps: preparing a hollow fiber membrane, preparing a CMC (Carboxy Methyl Cellulose) solution, and performing pressing molding, thereby obtaining the water treatment filtering membrane. Due to specific processes, the produced water treatment filtering membrane has high removal rates for sodium chloride and magnesium sulfate and has high water yield, and by adopting the method disclosed by the invention, continuous industrial production is achieved, nanofiltration functional layers are uniform and stable, and the water treatment filtering membrane has wide application prospects in fields of sweater and brackish water desalination, sewage treatment and ultrapure water preparation.

Description

technical field [0001] The invention relates to a filter membrane, in particular to a method for preparing a filter membrane for water treatment. Background technique [0002] Nanofiltration (NF) is a membrane separation process between reverse osmosis (RO) and ultrafiltration (UF). It is a membrane process developed in the late 1980s to meet the needs of industrial softened water and reduce costs. . Nanofiltration membrane still has high desalination performance under very low pressure and maintains high water permeability. Its pore size ranges from 0.5-2 nanometers. Its separation mechanism includes both mechanical sieving and charge repulsion, so it can be well The removal of divalent salts, as well as organic small molecule pollutants, pesticides, surfactants, etc. [0003] The pore size of the nanofiltration membrane is above 1nm, generally 1-2nm. It is a functional semi-permeable membrane that allows solvent molecules or some low-molecular-weight solutes or low-pric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/08B01D61/02C02F1/44C02F101/12C02F101/10
CPCB01D61/027B01D67/0002B01D69/08C02F1/442C02F2101/101C02F2101/12Y02A20/131
Inventor 翟锦树
Owner 深圳市树立水处理设备有限公司
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