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Preparation method of hollow fiber organic gas separation membrane

A technology for organic gas and separation membranes, which is applied in separation methods, semipermeable membrane separation, and dispersed particle separation, etc. It can solve the problem that the functional layer is only attached to the outer surface of the basement membrane, the surface of the basement membrane is detached from swelling, and internal pressure operation cannot be realized, etc. problems, to achieve the effect of expanding application and applicable conditions, large membrane flux, and good separation performance

Active Publication Date: 2017-03-15
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0008] In view of the low strength of the existing hollow fiber organic gas separation membrane, the thickness of the base membrane membrane wall is large, the mass transfer resistance is high, the functional layer is easily detached and swollen when coated on the surface of the base membrane, and the functional layer is only attached to the outer surface of the base membrane However, the problem that the internal pressure operation cannot be realized, the present invention uses the polymer hollow fiber membrane prepared by the melt stretching method as the base membrane, and utilizes its characteristics of wettability, membrane hole penetration and high porosity to fill the casting liquid into the base membrane Among the membrane pores, a filled hollow fiber organic gas separation membrane has been developed, which achieves internal pressure operation while obtaining good permeability and separation performance, and avoids the deformation of the hollow fiber organic gas separation membrane during external pressure operation. , to achieve high-pressure membrane filtration, thereby expanding the application and applicable conditions of membrane processes in the field of organic gas separation

Method used

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  • Preparation method of hollow fiber organic gas separation membrane
  • Preparation method of hollow fiber organic gas separation membrane
  • Preparation method of hollow fiber organic gas separation membrane

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preparation example Construction

[0041] Such as Figure 1-2 Shown, a kind of preparation method of hollow fiber organic gas separation membrane comprises the following steps:

[0042] (1) Preparation of casting solution: Add polydimethylsiloxane (PDMS) and ethyl orthosilicate to the organic solvent n-hexane or n-heptane, stir for 24 hours, and mix well to form a mixed solution; then add A certain amount of dibutyltin dilaurate as a catalyst is stirred and mixed evenly to form a casting solution.

[0043] (2) Basement membrane treatment: The polymer hollow fiber membrane prepared by the melt stretching method is selected as the basement membrane, and it is cleaned with ethanol or n-hexane to prevent other additives or solid particles remaining in the membrane pores from affecting the filling of the functional layer.

[0044] (3) Filling film preparation: the base film 1 is pulled through the scraping head 2 at a certain speed, and the scraping head 2 scrapes the casting liquid from the outside of the base fil...

Embodiment 1

[0047] (1) Preparation of casting solution: Add polydimethylsiloxane and ethyl orthosilicate to n-hexane, stir for 24 hours, and mix well to form a mixed solution. Polydimethylsiloxane and ethyl orthosilicate The mass fractions in the mixed solution are 40% and 8%, respectively. Then add dibutyltin dilaurate as a catalyst in an amount of 0.02% by mass to the above solution, stir to dissolve it completely, and prepare a casting solution.

[0048] (2) Basement membrane treatment: select the polyethylene hollow fiber membrane that wall thickness is 30 microns, porosity 50%, average aperture is 200 nanometers melt stretching method preparations as basement membrane, soak and clean basement membrane with normal hexane, Avoid other additives or solid particles remaining in the membrane pores to affect the filling of the functional layer.

[0049] (3) Filling film preparation: such as figure 1 As shown, the base film is dragged through the scraping head at a speed of 0.2m / min, and ...

Embodiment 2

[0053] (1) Preparation of casting solution: Add polydimethylsiloxane and ethyl orthosilicate to n-hexane solution, stir for 24 hours, and mix well to form a mixed solution. Polydimethylsiloxane and ethyl orthosilicate The mass fractions of esters in the mixed solution were 2% and 0.1%, respectively. Then, adding 0.001% of the catalyst dibutyltin dilaurate into the above solution and stirring it to completely dissolve it to prepare a casting solution.

[0054] (2) basement membrane treatment: select the polypropylene hollow fiber membrane that wall thickness is 50 microns, porosity 20%, and average aperture is 100 nanometers melt stretching method preparations as basement membrane, suitable for n-hexane to soak and clean the basement membrane, Avoid other additives or solid particles remaining in the membrane pores to affect the filling of the functional layer.

[0055] (3) Filling film preparation: such as figure 1 As shown, the base film is pulled through the scraping head ...

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Abstract

The invention relates to a preparation method of a hollow fiber organic gas separation membrane. The preparation method comprises following steps: 1, preparation of a membrane casting solution; 2, base membrane treatment; 3, filled membrane preparation; and 4, thermo-crosslinking. The hollow fiber organic gas separation membrane with organic gas separation capacity is prepared via the above steps finally. The preparation method is simple and continuous in process; the prepared hollow fiber organic gas separation membrane is high in strength, flux, and pressure resistance, low in mass transfer resistance, and stable in membrane performance; both internal pressure operation and external pressure operation can be adopted by the hollow fiber organic gas separation membrane; and the hollow fiber organic gas separation membrane can be applied in the fields of VOC recycling, industrial exhaust gas treatment, organic gas mixture separation, and other petrochemical, biological, pharmaceutical, and energy fields with requirements on high performance organic gas separation membrane preferably.

Description

technical field [0001] The invention relates to the technical field of membrane preparation and membrane surface modification, in particular to a preparation method of a hollow fiber organic gas separation membrane. Background technique [0002] In the process of oil refining, chemical industry and oil product storage and transportation, some organic gases are often discharged, such as saturated gases of various solvents discharged in the process of chemical production, oil and gas in oil depots, etc., which cause huge waste of resources and are also harmful to the environment. Has a great destructive effect. With the gradual improvement of environmental protection requirements and the economic interests of energy saving and consumption reduction, the efficient separation, enrichment and recovery of organic gases have become an urgent need. [0003] Compared with the traditional separation, enrichment and recovery methods of organic gases such as catalytic combustion and ac...

Claims

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Application Information

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IPC IPC(8): B01D71/70B01D69/08B01D67/00B01D53/22
Inventor 魏昕栾金义杨丽卢姝
Owner CHINA PETROLEUM & CHEM CORP
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