Preparation method of organic-inorganic composite separation membrane

An inorganic composite and separation membrane technology, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of high equipment requirements, changing proportions, and difficulty in obtaining a stable supply of raw materials in batches. The effect of increasing water flux

Active Publication Date: 2015-04-01
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Abstract
  • Description
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Problems solved by technology

[0006] In summary, there are several disadvantages in the direct use of prefabricated inorganic nanoparticles to prepare hybrid composite membranes: 1. The quality requirements of prefabricated inorganic nanoparticles are extremely high, and it is difficult to obtain a stable supply of raw materials in batches; 2. The introduction of inorganic nanoparticles The operation has high requirements on the equipment and requires a certain amount of extra time; 3. In the continuous production process, it must be ensured that the solution in which the inorganic nanoparticles are located is a fresh solution, otherwise the proportion drop will change uncontrollably

Method used

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  • Preparation method of organic-inorganic composite separation membrane

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Effect test

Embodiment 1

[0022]

[0023]

[0024] As shown in the table above, sodium silicate is added to the water phase as a soluble inorganic precursor, and different concentrations of sodium silicate are added to the water phase during the preparation of the two composite separation membranes. The results showed that in the system of piperazine-trimesoyl chloride as the monomer, the addition of sodium silicate did not affect the rejection rate of sodium chloride by the composite membrane, and had little effect on the water flux of the composite membrane. In the system with m-phenylenediamine-trimesoyl chloride as the monomer, the addition of sodium silicate will not affect the rejection rate of sodium chloride by the composite membrane, and can effectively increase the water flux by about 10L / m 2 h.

Embodiment 2

[0026]

[0027] As shown in the table above, the concentration of sodium silicate in the fixed water phase was 5%, and the pH value of the water phase was adjusted. The results showed that in the system of piperazine-trimesoyl chloride as the monomer, the change of pH value will not affect the rejection rate of sodium chloride of the composite membrane, and the influence on the water flux of the composite membrane is also small. In the system in which m-phenylenediamine-trimesic acid chloride is the monomer, the pH value should not be too high. When the pH of the water phase is less than 9 before adding polyamine and sodium silicate, the water flux can be effectively improved and the water Flux up to 50L / m 2 h. In addition, when the pH value of the aqueous phase is low, the rejection rate of the composite separation membrane has a certain attenuation.

Embodiment 3

[0029]

[0030]

[0031] As shown in the table above, ethyl orthosilicate is added to the oil phase as a soluble inorganic precursor, and different concentrations of ethyl orthosilicate are added to the oil phase during the preparation of the two composite separation membranes. The results show that in the system of piperazine-trimesic acid chloride as the monomer, the addition of tetraethyl orthosilicate will not affect the rejection rate of sodium chloride of the composite membrane, and has little effect on the water flux of the composite membrane . In the system where m-phenylenediamine-trimesyl chloride is the monomer, the addition of tetraethyl orthosilicate will not affect the rejection rate of sodium chloride in the composite membrane, and can effectively increase the water flux by about 25L / m 2 h.

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Abstract

The invention discloses a preparation method of a novel composite separation membrane, and particularly relates to a preparation method of an organic-inorganic composite separation membrane. A separation layer is composited onto a porous supporting membrane by utilizing a water phase and oil phase interface polymerization method, during the compositing process, a soluble inorganic matter precursor is added in the water phase, oil phase or the mixture of the water phase and the oil phase, the membrane forming process is changed, the hydrophilia of the composite membrane is improved, so that the water flux of the composite membrane can be improved on the premise of not influencing the separation performance of the composite membrane. The preparation method has advantage that the organic-inorganic hybridized composite separation membrane can be realized without changing or increasing the preparation procedure of the conventional composite separation membrane.

Description

technical field [0001] The invention relates to a method for preparing an organic-inorganic composite separation membrane, which includes a method for in-situ introducing inorganic nanoparticles during an interface reaction process. technical background [0002] The composite separation membrane is composed of a separation layer on the porous support membrane by means of an incompatible two-phase interface reaction. Composite separation membranes are characterized by the ability to selectively retain certain substances while allowing small molecule solvents to pass through. So far, membrane separation technology has become an indispensable key technology in many fields (resources, environment, energy, etc.), and its advantages lie in low energy consumption, high efficiency, low pollution, simple operation, and low follow-up maintenance costs. [0003] Most commercial composite separation membranes use ultrafiltration membranes made of polysulfone, polyethersulfone or polyac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/10B01D71/68B01D71/42
Inventor 李俊俊潘巧明
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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