Preparation method of ultra-low pressure contamination-resistance composite reverse osmosis membrane

A reverse osmosis membrane, anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of not much improvement in energy saving, loss of separation layer function, etc.

Inactive Publication Date: 2009-06-10
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For example, Chinese Patent Publication No. CN1213985A discloses a "reverse osmosis composite membrane and its method for reverse osmosis treatment of water", wherein the reverse osmosis composite membrane is a low-pollution composite reverse osmosis membrane, using PVA to coat polyamide layer surface, but because PVA molecules are not cross-linked, PVA is easy to gradually dissolve in water during the use of the membrane, and eventually loses its role as a separation layer
[0006] And Chinese patent publication number CN1923348A discloses a kind of " production

Method used

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  • Preparation method of ultra-low pressure contamination-resistance composite reverse osmosis membrane
  • Preparation method of ultra-low pressure contamination-resistance composite reverse osmosis membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0023] First, the PVA (the first grade of Wako produced by Wako Pure Chemical Industry Co., Ltd.) with the average degree of polymerization n=1750~3500 is dissolved in 80 DEG C of water, and it is configured into a solution of A that the mass concentration is 1%; then the average degree of polymerization is n= 600~70000 PEI (wako grade one produced by Wako Pure Chemical Industry Co., Ltd.) is dissolved in water, and it is configured into a C solution with a mass concentration of 1%, and a 5% glutaraldehyde solution and a 1% mass fraction The hydrochloric acid is mixed and stirred according to the molar ratio of glutaraldehyde and hydrochloric acid 1:1 to form B solution;

[0024] Get 2kg mass concentration and be 1% A solution, 1kg mass concentration is 1% C solution and B solution mixed cross-linking, wherein the quality that contains glutaraldehyde is 1.5g, be coated on polyamide membrane (Toray UTC- 70UB), placed at 120°C for 1 minute, then removed, and finally the membrane...

Embodiment 2

[0027] Except that maleic acid is selected as the crosslinking agent, other preparation processes are the same as in Example 1.

[0028] Carry out performance evaluation for the film of embodiment 2, condition is identical with embodiment 1, and the performance obtained is as shown in table 1 below,

Embodiment 3

[0030] Except that the consumption of cross-linking agent is adjusted to 3g, other conditions are identical with embodiment 1.

[0031] For the performance evaluation of the film of Example 3, the conditions are exactly the same as those of Example 1, and the obtained results are shown in Table 1.

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Abstract

The invention discloses a method for preparing an ultralow pressure fouling resistant composite reverse osmosis membrane. A layer of hydrophilic matter is coated onto an ultralow pressure polyamide membrane. The method comprises the following steps: preparing and mixing a polyvinyl alcohol solution, a polyethylene imine solution and a crosslinking agent solution; spreading the mixture onto a polyamide carrier membrane; and obtaining the ultralow pressure fouling resistant composite reverse osmosis membrane after drying. The reverse osmosis membrane has high water flux, a high salt rejection capability and good fouling resistance under the ultralow pressure operation.

Description

technical field [0001] The invention belongs to the field of membrane water treatment, and in particular relates to a production method of a composite reverse osmosis membrane with anti-pollution performance that can be applied under ultra-low pressure. Background technique [0002] At present, the common reverse osmosis composite membrane is to form a layer of polyamide separation layer through interfacial polymerization on the non-woven polysulfone support layer (for example, Chinese Patent No. CN1724130A, Chinese Patent No. CN1370796A, etc.). [0003] Although the above-mentioned polyamide composite membrane has good separation performance and permeation performance, it cannot avoid the current membrane fouling problem, such as the decrease of the permeation flow due to the adsorption or attachment of suspended or dissolved substances on the membrane surface, due to Membrane fouling is a problem. In order to obtain a certain flow rate of permeate, the pressure must be adj...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D69/12
Inventor 李永国杨瑜芳
Owner TORAY FIBER RES INST(CHINA) CO LTD
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