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Composite reverse osmosis membrane with high salt removing rate and controllable flux and method for preparing composite reverse osmosis membrane

A reverse osmosis membrane, composite technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of difficult membrane desalination and flux control, low water production, and high working pressure.

Inactive Publication Date: 2016-07-13
HUNAN KEENSEN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the existing domestic technology is concerned, membrane products that pursue high desalination rates do not have high water production; while products with high water production require relatively high working pressure or low desalination rates
In addition, in the process of reverse osmosis membrane, it is difficult to accurately control the desalination rate and flux of the membrane, and often the products produced cannot meet the expected performance requirements
As a result, the application of reverse osmosis membranes is restricted to a certain extent.

Method used

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  • Composite reverse osmosis membrane with high salt removing rate and controllable flux and method for preparing composite reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The reverse osmosis membrane production method is as follows:

[0026] 1. Preparation of aqueous phase solution: Add 3kg of m-phenylenediamine, 0.5kg of sodium dodecylbenzenesulfonate, and 4kg of N-methylpyrrolidone to 92.5kg of water, and stir to obtain an aqueous phase solution;

[0027] 2. Preparation of oil phase solution: Dissolve 0.1 kg of trimesoyl chloride in 100 kg of naphtha, stir well to obtain oil phase solution;

[0028] 3. First, coat the water-phase solution on the bottom membrane of the polysulfone support layer. After removing the excess solution on the surface with a low-pressure air knife, let the bottom membrane adsorbed with the water-phase solution pass through a closed space with a heating and ventilation system to control The internal temperature is 26°C, the relative humidity is 60%, and the time is 1min, so that the moisture on the surface of the bottom film is further volatilized. Keep it in an oven at ℃ for 5 minutes, dry the oil phase liqui...

Embodiment 2

[0031] The reverse osmosis membrane production method is as follows:

[0032] 1. Preparation of aqueous phase solution: Add 3kg of m-phenylenediamine, 0.5kg of sodium dodecylbenzenesulfonate, and 4kg of dimethyl sulfoxide to 92.5kg of water, and stir to obtain an aqueous phase solution;

[0033] 2, the preparation of oil phase solution: with embodiment 1;

[0034] 3. The film making method is the same as in Example 1.

[0035] The membrane detection method is the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0037] The reverse osmosis membrane production method is as follows:

[0038] 1. Preparation of aqueous phase solution: Add 3kg m-phenylenediamine, 0.5kg sodium dodecylbenzenesulfonate, 3kg N-methylpyrrolidone, 1kg dimethyl sulfoxide to 92.5kg water, stir well to obtain aqueous phase solution ;

[0039] 2, the preparation of oil phase solution: with embodiment 1;

[0040] 3. The film making method is the same as in Example 1.

[0041] The membrane detection method is the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a composite reverse osmosis membrane with a high salt removing rate and controllable flux and a method for preparing the composite reverse osmosis membrane.The method includes coating water-phase solution layers on a basement membrane with porous polysulfone support layers; coating oil-phase solution layers on the basement membrane; carrying out interfacial polymerization reaction on two phases to obtain polyamide ultrathin functional separation layers; cleaning and drying the basement membrane in follow-up procedures to obtain the composite reverse osmosis membrane.The composite reverse osmosis membrane and the method have the advantages that the composite reverse osmosis membrane produced by the aid of the method is detected by the aid of 1500ppm NaCl solution under the conditions of the pH (potential of hydrogen) of 7.5-8, the temperature of 25 DEG C and the test pressures of 150psi, the salt removing rate is 99.30%-99.75%, and the water flux is 33gfd-50gfd.

Description

technical field [0001] The invention relates to a reverse osmosis membrane, in particular to a composite reverse osmosis membrane with high desalination rate and controllable flux, and also relates to a preparation method of the above reverse osmosis membrane. 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. Compared with other membrane types (nanofiltration, ultrafiltration, microfiltration, etc.), it has The smaller membrane pore size can effectively remove impurities such as salts, organic matter, colloids, and bacteria in water. Reverse osmosis membranes have been widely used in many industries and fields such as the environment, pharmaceuticals, chemicals, and industries. The two key technical parameters of reverse osmosis membranes are desalination rate and water flux, and the two are ...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00B01D61/02
CPCB01D71/56B01D61/025B01D67/0006B01D69/125
Inventor 黄文欢龙昌宇曾浩浩石世业余普韧唐学军
Owner HUNAN KEENSEN TECH CO LTD
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