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Preparation method of oxidation-resistant non-discoloring composite reverse-osmosis membrane

A reverse osmosis membrane and anti-oxidation technology, applied in the field of membrane separation, can solve the problems of discoloration and yellowing of the membrane, and achieve the effect of solving discoloration and yellowing, performance improvement and low cost

Inactive Publication Date: 2019-04-12
蓝星(杭州)膜工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing production process can reduce the residual amine of the composite reverse osmosis membrane by the amine washing process, but the membrane will still appear discolored and yellow during storage.
Therefore, the production process of the existing composite reverse osmosis membrane urgently needs to solve the problem of discoloration and yellowing of the membrane.

Method used

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  • Preparation method of oxidation-resistant non-discoloring composite reverse-osmosis membrane

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preparation example Construction

[0018] The preparation method of composite reverse osmosis membrane in the application:

[0019] First, m-phenylenediamine (MPD), camphorsulfonic acid (CSA) and sodium dodecylsulfonate (SDS) were added into pure water, and the pH was adjusted with triethylamine (TEA) to prepare an aqueous phase solution; Trimellitic chloride (TMC) was dissolved in isoparaffin (Isopar G) to prepare an organic phase solution. Immerse the polysulfone support membrane (molecular mass cut-off of about 20k) in the aqueous phase solution for 60s, remove the excess aqueous phase solution on the surface after taking it out, then react in the organic phase solution for 30s, and then heat-treat it in an oven at 100°C for 6min to prepare A composite reverse osmosis membrane is obtained.

[0020] The treatment method of anti-oxidation and non-discoloration of composite film:

[0021] Soak the composite reverse osmosis membrane in a sulfur-containing compound solution with a mass concentration of 0.2-5wt%...

Embodiment 7-12

[0033]

[0034] Carry out diaphragm separation test and anti-oxidative discoloration experiment with the diaphragm of embodiment column 7-12

[0035]

[0036] The above examples show that the composite reverse osmosis membrane is soaked in a sulfide-containing solution, and the solution concentration needs to be controlled at 0.2-5.0wt%.

Embodiment 13-18

[0038]

[0039] Carry out diaphragm separation test and anti-oxidative discoloration experiment with the diaphragm of embodiment column 13-18

[0040]

[0041] The above implementation list shows that the composite reverse osmosis membrane is soaked in a sulfide-containing solution, the soaking time of the solution needs to be controlled at 2-5 minutes, the drying temperature is 50-80°C, and the drying time is 5-10 minutes. The salt rejection rate remains basically unchanged, while the ability to resist oxidation and discoloration has been greatly improved.

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Abstract

The invention relates to the field of membrane separation, and particularly relates to a preparation method of an oxidation-resistant non-discoloring composite reverse-osmosis membrane. According to the invention, a reverse-osmosis membrane composed of a non-woven fabric supporting layer, a polysulfone porous layer and a polyamide separation layer is soaked into a solution of a sulfur-containing compound with a certain mass concentration, surplus liquid is removed, and then drying treatment is carried out, so that the oxidation-resistant non-discoloring composite reverse-osmosis membrane is obtained. The advantages are as the follows that anti-oxidation non-discoloring performance of the composite reverse osmosis membrane is obviously improved, and meanwhile, the permeation flux and interception rate of the composite reverse osmosis membrane to separation of a sodium chloride salt solution are basically kept unchanged. The preparation method is simple and feasible, operation is simple,cost is low, and phenomena of yellowing and blackening of the composite reverse osmosis membrane in storage and use processes are avoided.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a preparation method of an anti-oxidation and non-discoloration composite reverse osmosis membrane. Background technique [0002] Membrane technology is a new separation technology with broad application prospects in the 21st century. It has the characteristics of operating at room temperature, no phase change, low energy consumption, and little pollution. With the application of membrane technology in the fields of chemical industry, medicine, food and beverage and environmental protection, etc., the market demand for membrane products is also increasing. The composite reverse osmosis membrane is a membrane product that can selectively separate the solute and solvent in the solution under a certain pressure, especially for the sodium chloride salt solution containing monovalent ions, which has a high rejection rate. Composite reverse osmosis membranes are widely used in water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/12B01D67/00
CPCB01D67/0002B01D69/12B01D71/68B01D2325/30
Inventor 刘涛张宇刘逸刘文超陈可可谭惠芬潘巧明
Owner 蓝星(杭州)膜工业有限公司
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