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Composite micro-pore-diameter filter membrane, preparation method thereof and application of composite micro-pore-diameter filter membrane in field of water treatment

A technology of microporous membrane and pore size, which is applied in water/sewage treatment, water/sludge/sewage treatment, osmosis/dialysis water/sewage treatment, etc. It can solve the problems of undiscovered patent reports and achieve the accuracy of measurement Improve, ensure normal operation, and improve the effect of membrane filtration rate

Pending Publication Date: 2021-12-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through domestic and foreign literature search, no relevant patent reports were found

Method used

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  • Composite micro-pore-diameter filter membrane, preparation method thereof and application of composite micro-pore-diameter filter membrane in field of water treatment
  • Composite micro-pore-diameter filter membrane, preparation method thereof and application of composite micro-pore-diameter filter membrane in field of water treatment
  • Composite micro-pore-diameter filter membrane, preparation method thereof and application of composite micro-pore-diameter filter membrane in field of water treatment

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] According to a typical embodiment of the present invention, the preparation method of the composite microporous filter membrane comprises: the membrane material is mixed cellulose resin (made by mixing nitrocellulose and cellulose acetate); The filter membrane is prepared according to the following process:

[0025] A filter membrane with a pore size of 0.45 μm + a filter membrane with a pore size of 5 μm or 3 μm is prepared by a lamination method to prepare a dense and homogeneous 0.45 μm membrane, which is pressed on a filter membrane with a pore size of 5 μm or 3 μm or dip-coated with a polymer solution by dip coating On microporous membranes with different pore sizes, and then dried to form → finished product.

[0026] During the production process of the composite microporous membrane, filter membranes of different colors are superimposed. During the detection and analysis process, it is convenient to distinguish the pore size of the upper and lower surfaces of the...

example 1

[0032] Table 1 The effect of the pore size of the double filter membrane on the filtration time (oilfield unpurified tertiary production sewage)

[0033] Pore ​​diameter of the upper filter membrane, μm Lower filter membrane pore size, μm 100ml, membrane time Suspended matter content, mg / L / 0.45 ＞30′ 154 1.2 0.45 4′45″ 56 2 0.45 3′14″ 52 3 0.45 1′49″ 50 5 0.45 1′46″ 50

[0034] Table 2 The effect of the pore size of the double filter membrane on the filtration time (oil field purification of tertiary production sewage)

[0035] Pore ​​diameter of the upper filter membrane, μm Lower filter membrane pore size, μm 100ml, membrane time Suspended matter contentmg / L - 0.45 1h filter 50ml 41 1.2 0.45 46′ 29 2 0.45 25′ 25 3 0.45 12′ 22 5 0.45 6′ 21

[0036] figure 1 Double-layer microporous membrane filtration, comparison of surface conditions after separation of upper and ...

example 2

[0039] Table 3 Effects of microporous membranes with different pore sizes on filtration capacity (oilfield unpurified tertiary mining wastewater)

[0040] Aperture / μm 10min membrane volume Measured suspended matter content, mg / L 0.45 60 255 1.2 139 224 2 158 206 3 192 185 5 253 167

[0041] It can be seen from the above table 2 that with the enlargement of the pore size, the filtration capacity is also increasing, and the measured value of the suspended matter content is also decreasing. Compared with the single filter membrane of 0.45μm, the filter membrane formed by stacking 5μm and 0.45μm filter membranes can increase the filtration volume from 60mL to 155mL, and the difference in suspended matter content is 2.35%.

[0042] According to the above-mentioned indoor evaluation results, the inventor believes that the above-mentioned results further reflect that the filter membrane pore size is too small, and more suspended matter ...

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Abstract

The invention discloses a composite micro-pore-diameter filter membrane, a preparation method thereof and application of the composite micro-pore-diameter filter membrane in the field of water treatment. The composite micro-pore-diameter filter membrane is formed by laminating and pressing micro-pore filter membranes with different pore diameters. According to the technical scheme, improvement is carried out on the basis of a traditional filter membrane method according to the water quality characteristics of oilfield tertiary recovery sewage, the microporous filter membranes with different pore diameters are stacked together and pressed to form the composite microporous filter membrane, the negative effects of residual polymers and surfactants in water can be effectively eliminated, the filtering speed and the filtering capacity of the filter membrane are improved, moreover, the determination accuracy is also improved, the problem of difficulty in determination of suspended solids in the three-sampling sewage at present is effectively solved, the requirements of production on data (accuracy and rapidness) can be met, and normal operation of a field process is guided and guaranteed. Similarly, the filter membrane is suitable for measuring the content of suspended solids in conventional sewage.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite microporous filter membrane, its preparation method and its application in the field of water treatment. Background technique [0002] In the process of water treatment in domestic oilfields, in order to control the quality of water injection in oilfields, the "SY / T5329 Water Quality Index and Analysis Method for Injection Water in Clastic Rock Reservoirs" was specially formulated. At a certain pressure, filter with a 0.45 μm cellulose lipid microporous filter membrane after constant weight, dry the filter membrane at 103-05°C to constant weight after the test, weigh the mass of the filter membrane after the test, and filter according to the filter before and after the test. The membrane difference divided by the volume of the filtered water sample is the suspended solids content in the water. This measurement method is feasible for the water body of the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/12B01D71/06B01D71/16C02F1/44
CPCB01D61/147B01D71/16B01D71/06B01D69/12B01D67/0002C02F1/444
Inventor 严忠刘鹏飞宫兆波黄连华张蕾蕾郭进周包思聪戴新河丛淑萍周俊佑周波
Owner PETROCHINA CO LTD
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