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Preparation of polytetrafluoroethylene hollow fiber membrane, membrane, membrane contactor and application of membrane and membrane contactor

A polytetrafluoroethylene and fiber membrane technology, which is applied in the preparation of polytetrafluoroethylene hollow fiber membranes, as well as in the fields of membrane and membrane contactors and applications, can solve the problem of reducing the contact area of ​​the hollow fiber membrane, reducing the stability of the membrane contactor, The problem of poor primary fiber strength, etc., can improve the dispersion, reduce the stretching process, and improve the processability.

Active Publication Date: 2018-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slit-like pore structure of the stretched microporous membrane is unfavorable to the flux of the membrane, and in order to ensure the working efficiency of the membrane contactor, the method of increasing the porosity by increasing the stretching ratio will cause macropores Occurs, reducing the stability of the membrane contactor process
In addition, the strength of the as-spun fiber is relatively poor. In order to make it stretch smoothly at a higher temperature, a larger-sized nozzle is usually used for spinning, and at the same time, the inner and outer diameters and wall thickness are increased, so that the hollow fiber can be kept during the stretching process. The shape is stable, but at the same time, this also leads to a large reduction in the contact area of ​​hollow fiber membranes prepared from the same raw materials, which is not conducive to improving the economy of the membrane

Method used

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  • Preparation of polytetrafluoroethylene hollow fiber membrane, membrane, membrane contactor and application of membrane and membrane contactor
  • Preparation of polytetrafluoroethylene hollow fiber membrane, membrane, membrane contactor and application of membrane and membrane contactor
  • Preparation of polytetrafluoroethylene hollow fiber membrane, membrane, membrane contactor and application of membrane and membrane contactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix PTFE resin, isoparaffin oil, and fumaric acid evenly at a mass ratio of 100:35:40. After the mixture is sealed and allowed to stand at 35°C for 48 hours, it is pre-pressed into a PTFE body by a pre-pressing machine. After extrusion, a PTFE primary fiber membrane is formed. The extrusion temperature is 95°C. After removing the lubricating aid at 300°C, it is sintered at 360°C for 180s to obtain a polytetrafluoroethylene hollow fiber membrane. The obtained hollow fiber membrane has an inner and outer diameter of 0.2-0.8 mm, a porosity of 62%, an average pore diameter of 0.17 μm, and a static water contact angle of 125°.

[0022] The membrane contactor assembly is filled with the above-mentioned membrane filaments, the filling rate is 50%, and the two ends of the membrane contactor are encapsulated with epoxy resin. With 15% CO 2 / N 2 The mixed gas is the raw material gas, the aqueous solution of diethanolamine with a mass fraction of 30% is used as the absorbent, an...

Embodiment 2

[0024] Mix PTFE resin, isoparaffin oil, and cetyltrimethylammonium bromide-modified fumaric acid at a mass ratio of 100:25:15. The press pre-presses it into a PTFE green body, and forms a PTFE primary fiber film after high-pressure extrusion. The extrusion temperature is 45°C. After removing the lubricating aid at 340°C, it is sintered at 390°C for 60s to obtain a polyester fiber. Tetrafluoroethylene hollow fiber membrane. The obtained hollow fiber membrane has an inner and outer diameter of 1-1.8 mm, a porosity of 35%, an average pore diameter of 0.08 μm, and a static water contact angle of 110°.

[0025] The membrane contactor assembly is filled with the above-mentioned membrane filaments, the filling rate is 60%, and the two ends of the membrane contactor are encapsulated with epoxy resin. With 15% CO 2 / N 2 The mixed gas is the raw material gas, the aqueous solution of diethanolamine with a mass fraction of 30% is used as the absorbent, and the CO 2 removal effect. Wh...

Embodiment 3

[0027]Mix PTFE resin, isoparaffin oil, and naphthalene evenly at a mass ratio of 100:30:30. After the mixture is sealed and allowed to stand at 50°C for 36 hours, it is pre-pressed into a PTFE body with a pre-pressing machine and extruded under high pressure. After that, PTFE primary fiber membrane is formed, and the extrusion temperature is 80°C. After removing the lubricating aid at 330°C, it is sintered at 340°C for 450s to obtain a polytetrafluoroethylene hollow fiber membrane. The obtained hollow fiber membrane has an inner and outer diameter of 0.8-1.5 mm, a porosity of 55%, an average pore diameter of 0.45 μm, and a static water contact angle of 115°.

[0028] The membrane contactor assembly is filled with the above-mentioned membrane filaments, the filling rate is 50%, and the two ends of the membrane contactor are encapsulated with epoxy resin. With 15% CO 2 / N 2 The mixed gas is the raw material gas, the aqueous solution of diethanolamine with a mass fraction of 30...

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Abstract

The invention relates to preparation of a polytetrafluoroethylene hollow fiber membrane and application of a membrane contactor of the polytetrafluoroethylene hollow fiber membrane. The microscopic morphology and micropore structure of the polytetrafluoroethylene hollow fiber membrane are improved by adding a specific porogenic agent, so that controllability of membrane pores during preparation can be improved. The polytetrafluoroethylene hollow fiber membrane is obtained through proportioning, curing, pre-press forming, extruding, degreasing, thermal sintering and other steps. Compared with atraditional process for preparing a polytetrafluoroethylene microporous membrane, the method omits a stretching process, not only can the production efficiency be improved, but also the processability of the hollow fiber membrane can be improved; in addition, different from elongated micropores obtained by using a conventional stretching method, a non-elongated pore structure is obtained, and theporogenic agent has an obvious porogenic effect; the prepared hollow fiber membrane filament is assembled into the contactor which can be used for separating or removing certain components in continuous air flow, such as purification of natural gas and biogas, decarbonization of flue gas, removal of oxygen in water.

Description

technical field [0001] The invention relates to the preparation of a polytetrafluoroethylene hollow fiber membrane and its application to a membrane contactor. Background technique [0002] Membrane contactor refers to a new type of membrane system used for two-phase contact (the process diagram is as follows figure 1 shown). Since its appearance in the 1980s, it has gradually played a pivotal role in some separation systems and has a very wide application potential. Due to its unique structure and mode of operation, compared with relatively traditional gas separation processes, membrane contactors (such as figure 2 shown) has the following advantages: high mass transfer coefficient and separation efficiency, compact equipment structure, independent control of gas-liquid two-phase flow rate, and can be used in combination with other systems, especially desorption systems. The most prominent feature of the membrane contactor is that it can be operated on a clear and stabl...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D63/02B01D71/36B01D53/22C10L3/10C02F1/44C02F1/20
CPCB01D53/228B01D63/02B01D67/0004B01D67/0025B01D71/36B01D2258/0283B01D2258/05B01D2321/168B01D2323/50B01D2325/02B01D2325/021B01D2325/028B01D2325/38C02F1/20C02F1/44C10L3/101
Inventor 康国栋贾静璇李萌刘丹丹周美青邹彤曹义鸣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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