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Microporous activated carbon fiber and preparation method thereof

An activated carbon fiber and microporous technology, applied in the field of microporous activated carbon fiber and its preparation, can solve the problems of reducing fiber strength, low carbonization temperature, and reducing yield, and achieve enhanced adsorption force, enhanced hydrophobicity, and no stickiness and the effect of the problem

Active Publication Date: 2022-07-05
QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are following problems in this activated carbon fiber preparation technology: (1) the physical activation method needs to use the oxidizing property of activated gas to erode the surface of activated carbon fiber at high temperature, remove tar and uncarbonized matter, and produce new pores, thereby causing huge Ratio of material ablation and dimensional shrinkage, reducing yield and increasing production cost
(2) The activation process inevitably causes the loss of carbon components and reduces the fiber strength
[0004] However, the existing phosphoric acid chemical activation method ACF products usually have the following problems: (1) the oxidation of phosphoric acid in the preparation process of the chemical activation method ACF will increase the content of oxygen-containing functional groups on the surface of the material
Oxygen-containing functional groups, acidic functional groups and other strong hydrophilic functional groups lead to poor hydrophobicity of the material, and it is easy to adsorb water molecules, so that the adsorption sites are occupied and the adsorption force on pollutants is reduced.
(2) The pore size of the ACF product prepared by the physical method is concentrated below 0.8nm, and the adsorption force on VOCs is much higher than that on water. Although the activated carbon fiber prepared by the chemical method has a large specific surface area and a wide range of pore size distribution, it is beneficial Desorption, but its adsorption force of VOCs is weaker than the physical method ACF, resulting in the material's adsorption performance on VOCs being greatly affected by the water content and the humidity of the exhaust gas
(3) The final carbonization temperature in the preparation process of chemical activation method ACF is low, resulting in incomplete removal of H and O elements, and its ignition point is lower than that of physical method ACF

Method used

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  • Microporous activated carbon fiber and preparation method thereof

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Embodiment 1

[0039] A microporous activated carbon fiber, the ash content of the activated carbon fiber is 1.25wt%, the ignition point is 413°C, and the specific surface area is 2089m 2 / g, there is no sticky and filament problem, the wicking height is 15cm, the content of O element is 13.41%, the content of C element is 69.86%, and the content of H element is 1.95%; the pore size distribution is as follows figure 2 As shown, the proportion of pores below 0.8 nm is about 45%, and the proportion of pores between 0.8-2 nm is about 55%.

[0040]The preparation method is as follows: viscose fiber mat and 12% phosphoric acid solution are mixed in a ratio of fiber to phosphoric acid mass ratio of 1:0.6, immersed at 40°C for 30 minutes, dried by hot air at 50°C for 5 hours, and then carbonized under nitrogen atmosphere. Treatment, carbonization selects a gradient heating process, that is, the temperature of the first gradient is 90°C and the time is 20min, the temperature of the second gradient ...

Embodiment 2

[0043] A microporous activated carbon fiber, the ash content of the activated carbon fiber is 1.93wt%, the ignition point is 435°C, and the specific surface area is 1966m 2 / g, there is no sticky and filament problem, the wicking height is 13cm, the content of O element is 8.05%, the content of C element is 89.03%, and the content of H element is 1.61%; the pore size distribution is as follows image 3 As shown, the proportion of pores below 0.8 nm is about 48%, and the proportion of pores between 0.8-2 nm is about 52%.

[0044] The preparation method is as follows: the solvent method cellulose fiber mat and 7% phosphoric acid solution are mixed in a ratio of fiber to phosphoric acid mass ratio of 1:0.8, immersed at 50°C for 30 minutes, dried at 30°C for 7 hours, and then carried out in an air atmosphere. For carbonization treatment, the carbonization selects a gradient heating process, that is, the temperature of the first gradient is 100°C and the time is 30min, the temperat...

Embodiment 3

[0047] A microporous activated carbon fiber, the ash content of the activated carbon fiber is 1.14wt%, the ignition point is 445°C, and the specific surface area is 1655m 2 / g, there is no sticky and filament problem, the wicking height is 9cm, the content of O element is 5.07%, the content of C element is 85.55%, and the content of H element is 1.13%; the pore size distribution is as follows Figure 4 As shown, pores below 0.8 nm account for about 50%, and pores between 0.8-2 nm account for about 50%.

[0048] The preparation method is as follows: cupro ammonia fiber cloth and 15% phosphoric acid solution are mixed at a ratio of fiber to phosphoric acid mass ratio of 1:0.2, immersed at 60° C. for 60 minutes, dried at 60° C. for 3 hours, and then carbonized in a nitrogen atmosphere. , carbonization selects the gradient heating process, that is, the temperature of the first gradient is 120 °C and the time is 40 minutes, the temperature of the second gradient is 180 °C and the t...

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Abstract

The invention provides a microporous activated carbon fiber and a preparation method thereof, belonging to the field of activated carbon fibers. The ash content of the microporous activated carbon fiber is 1.1wt%-2.0wt%, and the specific surface area is 1500m 2 / g‑2100m 2 / g, pores below 0.8nm account for 40-50%, pores with 0.8-2nm account for 50-60%, no mesopores larger than 2nm, O element content accounts for 5%-15%, C element content accounts for 65%-90%, H element content is 1%-2%, flash point is 300-450℃. Its preparation method: impregnating raw materials with phosphoric acid aqueous solution, carbonization after drying, washing with water and high temperature modification to obtain the activated carbon fibers; the raw materials are man-made fibers and / or natural fibers; the mass fraction of the phosphoric acid aqueous solution is 5%-15% %. The microporous activated carbon fiber has no mesopores, a high proportion of 0.8-2nm micropores, large specific surface area, high strength, and no sticking problem; at the same time, it has high ignition point, strong hydrophobicity, and enhanced VOCs adsorption force; preparation method Low cost and high product yield.

Description

technical field [0001] The invention relates to the field of activated carbon fibers, in particular to a microporous activated carbon fiber and a preparation method thereof. Background technique [0002] The physical activation method is the preparation method of activated carbon fiber commonly used in industrial production. After the activator is pretreated and carbonized, the carbon monoxide or carbon dioxide gas generated by the reaction with the physical activator (carbon dioxide, water vapor, etc.) at high temperature escapes from the surface of the activated carbon fiber, so that part of the carbon fiber is gasified, so that inside the carbon monoxide or carbon dioxide gas. Many micropores are created. This activated carbon fiber preparation technology has the following problems: (1) The physical activation method needs to use the oxidizing property of the activated gas to erode the surface of the activated carbon fiber at high temperature, remove tar and uncarbonized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01D53/02D01F9/16B01J20/30
CPCB01J20/20B01J20/28023D01F9/16B01D53/02B01D2257/708Y02A50/20
Inventor 万月亮陈保磊梁鹏王玲玲迟淑丽
Owner QINGDAO HSJ ENVIRONMENTAL PROTECTION TECH CO LTD