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

A polytetrafluoroethylene and fiber membrane technology is used in the preparation of polytetrafluoroethylene hollow fiber membranes, as well as in the fields of membrane and membrane contactors and applications, to achieve the effects of improving dispersibility, improving affinity, and obvious pore-forming effects.

Active Publication Date: 2021-06-04
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

[0008] In order to solve the problems related to the preparation of polytetrafluoroethylene hollow fiber membranes by the traditional stretching method, the present invention provides a method for preparing polytetrafluoroethylene hollow fiber membranes by adding a specific porogen and the application of the membrane contactor. The membrane contactor is provided by the present invention The polytetrafluoroethylene hollow fiber membrane prepared in is filled, and the gas-liquid two-phase contacts through the membrane for mass transfer.

Method used

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

Examples

Experimental program
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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, cetyltrimethylammonium bromide-modified fumaric acid at a mass ratio of 100:25:15, and keep the mixture at 22°C for 96 hours, then use a pre- 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 u...

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 the preparation of a polytetrafluoroethylene hollow fiber membrane and its application in a contactor. The microscopic appearance and microporous structure of the polytetrafluoroethylene hollow fiber membrane are improved by adding a specific porogen, and the membrane pore density is improved during the preparation process. Controllability. The porous polytetrafluoroethylene hollow fiber membrane is obtained through the steps of batching, aging, pre-pressing, extrusion, degreasing and thermal sintering. Compared with the preparation process of the traditional polytetrafluoroethylene microporous membrane, the method of the invention reduces the stretching process, not only improves the production efficiency, but also improves the processability of the hollow fiber membrane. In addition, unlike the elongated micropores obtained by the traditional stretching method, the porogen of the present invention has an obvious porogenic effect and obtains a non-elongated pore structure. The prepared hollow fiber membranes are assembled into a contactor, which can be used to separate or remove certain components in a continuous gas flow, such as natural gas and biogas purification, flue gas decarbonization, and oxygen removal 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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Patent Type & Authority Patents(China)
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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