Method for increasing performance of reverse osmosis membrane

A technology of reverse osmosis membrane and performance, which is used in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc. Permeable membrane operating costs and other issues, to achieve the effect of reducing the frequency of pollution, improving the desalination rate and water flux, and reducing the cost

Inactive Publication Date: 2017-01-25
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for the reverse osmosis membrane prepared by the interfacial polymerization method, diamine and other substances are used as the aqueous phase monomer, and acid chloride and the like are used as the organic phase monomer, so that a large amount of functional monomers remain on the surface of the prepared reverse osmosis membrane. As a result, the ability of the reverse osmosis membrane to resist dissolved oxygen and residu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] Experimental group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.2wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 4.0wt% m-phenylenediamine was used as the water phase. Reverse osmosis membrane is prepared by the oil-water phase interface polymerization process. After removing the oil phase solvent on the surface of the reverse osmosis membrane, pickling agent is used for acid rinsing treatment, and then chemical surface treatment. Chemical surface treatment is first chemical surface pretreatment, and then chemical surface treatment. Surface post-treatment, chemical surface treatment is immersion treatment, and then put it in a moisturizer to rinse the moisturizing treatment.

[0022] For the above pickling agent, the mass concentration of acid in the aqueous solution is 6.5%, the rinsing time is 60 minutes, and the pickling agent temperature is 10...

Example Embodiment

[0032] Example 2

[0033] Experimental group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.3wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 6.0wt% m-phenylenediamine was used as the water phase. Reverse osmosis membrane is prepared by the oil-water phase interface polymerization process. After removing the oil phase solvent on the surface of the reverse osmosis membrane, pickling agent is used for acid rinsing treatment, and then chemical surface treatment. Chemical surface treatment is first chemical surface pretreatment, and then chemical surface treatment. Surface post-treatment, chemical surface treatment is immersion treatment, and then put it in a moisturizer to rinse the moisturizing treatment.

[0034] For the above pickling agent, the mass concentration of the acid in the aqueous solution is 10%, the rinsing time is 30 minutes, and the pickling agent temperature is...

Example Embodiment

[0044] Example 3

[0045] Experimental group: The porous polysulfone ultrafiltration membrane was used as the support layer, the cyclohexane solution containing 0.25 wt% trimesoyl chloride was used as the oil phase, and the aqueous solution containing 5.0 wt% m-phenylenediamine was used as the water phase. Reverse osmosis membrane is prepared by the oil-water phase interface polymerization process. After removing the oil phase solvent on the surface of the reverse osmosis membrane, pickling agent is used for acid rinsing treatment, and then chemical surface treatment. Chemical surface treatment is first chemical surface pretreatment, and then chemical surface treatment. Surface post-treatment, chemical surface treatment is immersion treatment, and then put it in a moisturizer to rinse the moisturizing treatment.

[0046] For the above pickling agent, the mass concentration of the acid in the aqueous solution is 20%, the rinsing time is 60 minutes, and the pickling agent temperature...

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Abstract

The invention relates to the technical field of reverse osmosis membrane performance improving, in particular to a method for increasing the performance of a reverse osmosis membrane. The method includes: using a pickling agent to perform acid pickling on the reverse osmosis membrane after interface polymerization is completed, then using a chemical surface treating agent to perform chemical surface treatment, and using a humectant to perform moisturizing treatment on the reverse osmosis membrane. The method has the advantages that the charge density and chemical components of the polyamide desalting layer of the reverse osmosis membrane can be precisely regulated, the desalting rate and water flux of the reverse osmosis membrane are improved at the same time, the hydrophilicity of the reverse osmosis membrane is increased, pollution occurrence frequency is lowered, the cleaning recovery ability of the reverse osmosis membrane during the actual operation of the reverse osmosis membrane is increased, the defect of an imperfect desalting layer network structure caused by the interface polymerization is overcome, the content of residual monomer is reduced, the desalting rate is increased by 0.5%, and the flux is increased by 20-60%.

Description

Technical field [0001] The invention relates to the technical field of improving the performance of reverse osmosis membranes, in particular to a method for improving the performance of reverse osmosis membranes. Background technique [0002] Reverse osmosis, also known as reverse osmosis, is a separation technology that uses pressure difference as the driving force to separate solvent from solution. Reverse osmosis membrane is a membrane device used in the field of reverse osmosis separation technology, which can intercept various inorganic ions, alternating substances and macromolecular solutes. The development of reverse osmosis membrane technology is relatively rapid, and it has been applied in many fields such as food, medicine, and chemical industry. It is made of polymer materials, such as polyurethane, cellulose acetate, aromatic polyhydrazide, etc. The performance of the reverse osmosis membrane is also closely related to the material selected, which leads to uncertain ...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D65/06B01D65/02
CPCB01D61/025B01D65/02B01D65/06B01D67/0088B01D2321/28
Inventor 梁松苗吴宗策蔡志奇金焱陶建
Owner VONTRON MEMBRANE TECH CO LTD
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