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Low-pollution compound reverse osmosis membrane

A reverse osmosis membrane, low-pollution technology, applied in the field of water treatment, can solve the problems of loss of protective layer, colloidal particle pollution, biochemical pollution, etc., and achieve the effect of improving anti-pollution performance, large water flux, and high desalination rate

Active Publication Date: 2010-12-29
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the process of purifying water, the reverse osmosis membrane will also be polluted by some organic or inorganic substances in the water, such as inorganic ions, bacteria, viruses, organic substances and colloids in raw water will be adsorbed on the reverse osmosis membrane, resulting in colloidal particles Pollution and biochemical pollution, it has been mentioned before that PVA is used to coat the surface of the polyamide layer to improve its pollution resistance, but the PVA used in it has a high degree of saponification (99%), which requires a relatively high water temperature for dissolution. Close to 80°C, more difficult to operate
Moreover, during the use of the diaphragm, the PVA layer is easy to dissolve in water and fall off, and eventually loses its protective layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The difference from Comparative Example 1 is that a cross-linked PVA layer is added on the polyamide layer to obtain the final composite reverse osmosis membrane. The cross-linked PVA layer is that 3kg of polyvinyl alcohol (PVA) with an average degree of polymerization of 1000 (n=1000) and a degree of saponification of 75% is dissolved in 97kg of hot water at 60°C, and after mixing well, add 0.5kg Glutaraldehyde and 0.2kg of hydrochloric acid, continue to stir to make it react fully, apply the solution obtained from the reaction on the polyamide layer, and then dry it. For the composite reverse osmosis membrane of this example, its contact angle was measured to be 22°, and the same test method as that of Comparative Example 1 was adopted, and the obtained results are shown in Table 1.

Embodiment 2

[0023] Except that the polyvinyl alcohol (PVA) in Example 1 is replaced by polyvinyl alcohol (PVA) with an average degree of polymerization of 500 (n=500) and a degree of saponification of 75%, the same operation as in Example 1 is used to prepare Composite reverse osmosis membrane. The contact angle was measured to be 21°, and then the same test method as in Comparative Example 1 was adopted, and the obtained results are shown in Table 1.

Embodiment 3

[0025] Except that 0.8 kg of glyoxal was used instead of 0.5 kg of glutaraldehyde, a composite reverse osmosis membrane was prepared by the same operation as in Example 1. Measure its contact angle to be 20°, then adopt the same test method as Comparative Example 1, and the obtained results are shown in Table 1.

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Abstract

The invention discloses a low-pollution compound reverse osmosis film, which comprises the following parts: nonwoven layer, polysulfone support layer and polyamide layer on the polysulfone support layer, wherein the crosslinked PVA layer is set on the polyamide layer, which is crosslinked by one of aliphatic dialdehydes, hydroxy fatty acid, acid anhydride or polyvalent anion salt compound and PVA solution. The invention overcomes the defect of easy stripping of PVA layer to improve the anti-pollution property of composite osmosis reverse film to lengthen the using life, which is easy to prepare and operate with high desalinization rate and large water flux, therefore fitting for water disposing course in wider domain to expand the application of the reverse osmosis film.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a reverse osmosis membrane used for water treatment. Background technique [0002] Reverse osmosis technology is a separation method that separates the solute and the solvent in the solution by means of the selective interception of the reverse osmosis membrane under a certain pressure. It is widely used in sewage treatment and liquid purification and concentration, the most common of which is The application is in the water treatment process, using reverse osmosis technology to remove impurities such as inorganic ions, bacteria, viruses, organic matter and colloids in raw water to obtain high-quality pure water. However, during the process of purifying water, the reverse osmosis membrane will also be polluted by some organic or inorganic substances in the water, such as inorganic ions, bacteria, viruses, organic substances and colloids in raw water will be adsorbed on the reverse ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56C02F1/44
CPCY02A20/131
Inventor 吴宗策蔡志奇赵小阳何耀华龙昌宇刘枫王思亮
Owner VONTRON TECH CO LTD
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