A kind of structural carbon film and preparation method thereof

A carbon film and film forming technology, applied in the field of structural carbon film and its preparation, can solve the problem of increasing the difficulty and complexity of composite carbon film manufacturing, reducing the gas permeation flux of composite carbon film, and the small gas permeation flux of composite carbon film, etc. problem, to achieve excellent gas separation effect, low production cost, and high gas separation selectivity

Active Publication Date: 2021-09-24
临沂市产品质量监督检验所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to prepare a defect-free composite carbon membrane, it is necessary to use a support with a small pore size and no defects on the surface, so that the gas permeation flux of the obtained composite carbon membrane is small; Pinholes or defects, it is difficult to prepare a continuous non-defective composite carbon film at one time, and multiple coating-carbonization cycle preparation processes must be used, which not only increases the manufacturing difficulty and complexity of the composite carbon film, but also increases the manufacturing cost. It also significantly reduces the gas permeation flux of the composite carbon membrane

Method used

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preparation example Construction

[0034] In the specific implementation process, the structural carbon membrane of the present invention is composed of a carrier, a carbon membrane main body and functional materials filled in the carbon membrane main body, wherein: the porous carrier has high mechanical strength; the carbon membrane main body is a continuous phase with abundant Microporous structure: Functional materials are evenly dispersed in the main body of the carbon membrane to play the function of adjusting the micropore distribution of the carbon membrane. The preparation method of the structured carbon membrane comprises the following steps: pretreating the surface of the porous carrier; dissolving the carbon-containing resin, and vigorously mixing it with the functional material to obtain a film-forming precursor; coating the surface of the porous carrier with the film-forming precursor, and drying it; Finally, the structural carbon film is obtained through carbonization, post-treatment and other step...

Embodiment 1

[0037] In this embodiment, the porous alumina ceramic tube with an average pore diameter of 100nm and a porosity of 60% (inner diameter 10mm, outer diameter 13mm) is used as a carrier, and the surface of the carrier is carefully polished with 1800# sandpaper until smooth; the concentration used is 12wt% Nitric acid solution, treated at 30 degrees Celsius for 25 minutes, then washed in excess deionized water, dried, and set aside.

[0038] The preparation phenolic resin concentration is the resin solution of 42wt%, and adds therein the polyvinylidene fluoride microsphere (particle diameter is 200nm) that accounts for 1.5wt% of film-forming solution, degassing after vigorous stirring 6 hours, obtains film-forming solution for subsequent use; The above-mentioned carrier tube sealed at both ends was immersed in the film-forming solution, held for 30 seconds, then taken out, dried at 40 degrees Celsius for 12 hours, and finally carbonized at 750 degrees Celsius for 4 hours.

[0039...

Embodiment 2

[0044] In the present embodiment, the porous stainless steel plate with the average pore diameter of 220nm and 72% porosity (thickness is 1.5mm) is used as the carrier, and the surface of the carrier is carefully polished with 2000# sandpaper until it is smooth; the concentration is 20wt% nitric acid solution, Treat at 25°C for 20 minutes, then wash in excess deionized water, dry, and set aside.

[0045] The preparation phenolic resin concentration is the resin solution of 50%, and adds the polyethylene microsphere (particle diameter is 300nm) that accounts for film-forming solution 1wt% therein, degassing after strong stirring 12 hours, obtains film-forming solution for subsequent use; The sealed carrier tube was immersed in the film-forming solution, held for 60 seconds, then taken out, dried at 40°C for 12 hours, and finally carbonized at 950°C for 2 hours.

[0046] Soak the above-mentioned carbon film in a 12wt% potassium permanganate solution, keep it at 25 degrees Celsiu...

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PUM

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Abstract

The invention relates to the field of carbon-based membrane separation materials, in particular to a structural carbon membrane and a preparation method thereof. The structural carbon membrane is composed of a carrier, a main body of the carbon membrane and functional materials filled in the main body of the carbon membrane, among which: the porous carrier has high mechanical strength; the main body of the carbon membrane is a continuous phase with a rich microporous structure; the functional material is uniformly Dispersed in the main body of the carbon membrane, it plays the function of adjusting the micropore distribution of the carbon membrane. The carbon membrane with this structure has high strength and excellent gas separation effect. The preparation method comprises the following steps: pretreatment of the surface of the porous carrier; dissolving the carbon-containing resin and vigorously mixing with the functional material to obtain a film-forming precursor; coating the surface of the porous carrier with the film-forming precursor and drying it; and so on to obtain the structural carbon membrane. The method realizes the precise control of the micropore structure of the carbon membrane, and improves the performance stability of the carbon membrane under high-temperature working conditions, and has the advantages of simple preparation process, low production cost, and short production cycle.

Description

technical field [0001] The invention relates to the field of carbon-based membrane separation materials, in particular to a structural carbon membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new high-tech, but also a multi-disciplinary interdisciplinary science and technology. As a new type of separation technology, gas separation membrane technology has the technical characteristics of "high efficiency, economy, convenience and cleanness" compared with traditional gas separation technologies. It has broad application prospects in gas removal, recovery of hydrogen and organic hydrocarbon gases in petrochemical and ammonia synthesis tail gases. [0003] Carbon membrane is a new type of carbon-based membrane separation material, which organically integrates the excellent structural characteristics of carbon materials (rich pore structure, uniform pore size distribution) and the advantages of membrane materials (such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B35/52C04B35/622
CPCC04B35/52C04B35/62218C04B38/00C04B38/0074C04B38/0054
Inventor 殷慧敏张红卫赵旭东朱薪宇王松张馨丹
Owner 临沂市产品质量监督检验所
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