Method for preparing low-cost asphalt-based spherical activated carbon with hierarchical porouse structure

A technology of spherical activated carbon and structured asphalt, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of increasing fixed asset costs, inflammability and explosion, and shorten the production process, shorten the reaction time, improve The effect of contact area

Active Publication Date: 2018-12-18
湖南曦威新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (5) Refined naphthalene and organic solvent extractants are not only flammable and explosive, but also have strict requirements on plant structure and equipment layout, further increasing the cost of fixed assets

Method used

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  • Method for preparing low-cost asphalt-based spherical activated carbon with hierarchical porouse structure
  • Method for preparing low-cost asphalt-based spherical activated carbon with hierarchical porouse structure
  • Method for preparing low-cost asphalt-based spherical activated carbon with hierarchical porouse structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Using high-temperature coal tar pitch with a softening point of 130°C as raw material, 1000kg of medium-temperature coal tar pitch is crushed into coal tar pitch particles with a diameter of 0.6-0.8mm using a roller crusher. The asphalt particles were successively placed in a 5000L high pressure reactor, and 99.99% high-purity nitrogen was introduced to keep the pressure in the reactor at 0.5MPa. The reaction medium was heated to 140°C at a heating rate of 5°C / min, kept at a constant temperature for 30 minutes, and then cooled to 50°C naturally. Because the pelletizing temperature is 10°C higher than the softening point of high temperature coal tar pitch, and under the action of surface tension and polyvinyl alcohol surfactant, all high temperature coal tar pitch particles become spherical coal pitch balls. Then the pitch balls were placed in a rotary kiln and passed through for 20m 3 / h of air, and heated to 330°C at a heating rate of 0.5°C / min and kept at a constant ...

Embodiment 2

[0054] Taking heavy asphalt slag as raw material, the softening point of the raw material is 226° C., the coking value is 76.8%, and the content of quinoline insoluble matter is 43.9%. Using a twin-screw extruder, 1000 kg of heavy asphalt residue and 100 kg of coal tar were uniformly mixed to form coal tar / heavy asphalt residue bars with a diameter of 3 mm. Using a roller crusher, 1100kg of coal tar / heavy asphalt slag bars were crushed into coal tar / heavy asphalt slag particles with a diameter of 0.6-0.8 mm. 3000L of deionized water, 10kg of polyvinyl alcohol, and 500kg of coal tar / heavy asphalt slag particles were placed in a 5000L high-pressure reactor successively, and 99.99% high-purity nitrogen was introduced to keep the pressure in the reactor at 0.5MPa. Then, the reaction medium was heated to 93°C at a heating rate of 5°C / min, kept at a constant temperature for 30 minutes, and then cooled to 50°C naturally. The produced 1100kg product is coal tar / heavy asphalt slag bal...

Embodiment 3

[0056] Using heavy asphalt slag with a softening point of 226°C as raw material, 1000kg of heavy asphalt slag and 270kg of coal tar were uniformly mixed with a twin-screw extruder to produce coal tar / heavy asphalt slag with a diameter of 3mm. Using a roller crusher, 1270kg of coal tar / heavy asphalt slag bars were crushed into coal tar / heavy asphalt slag particles with a diameter of 0.6-0.8 mm. 3000L of deionized water, 10kg of polyvinyl alcohol, and 500kg of coal tar / heavy asphalt slag particles were placed in a 5000L high-pressure reactor successively, and 99.99% high-purity nitrogen was introduced to keep the pressure in the reactor at 0.5MPa. Then, the reaction medium was heated to 193°C at a heating rate of 5°C / min, kept at a constant temperature for 30 minutes, and then cooled to 50°C naturally. Due to the high spheroidizing temperature, coal tar / heavy asphalt slag particles dissolve and coalesce at this spheroidizing temperature, and only ellipsoidal coal tar / heavy aspha...

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Abstract

The invention discloses a low-cost asphalt-based spherical activated carbon with hierarchical porouse structure. According to the invention, asphaltic coal with softening point of 130-230 DEG C is used as a raw material, a low-temperature decomposable organic matter is used as a pore forming agent, after mixing, crushing, spheroidizing, air oxidation, liquid phase oxidation, charring, steam activation, and pickling, the asphalt-based spherical activated carbon is prepared.Regarding the asphalt-based spherical activated carbon, sphere diameter is 0.4-1.5 mm, density is 0.5-0.85 g/cm<3>, ratiospecific surface area is 800-1,500 m<2>/g, vibration strength is greater than 95%, microporous content is 60-83%, mesoporous content is 30-5%, macroporous content is 10-12%, and sphericity is greater than 99%.The invention has significant important significance for promoting the engineering of asphaltpitch-based spherical activated carbon and promoting the application of spherical activated carbon in civil, industrial, aerospace and other fields.

Description

technical field [0001] The invention relates to a preparation method of pitch-based spherical activated carbon, in particular to a preparation method of pitch-based spherical activated carbon with low cost and hierarchical pore structure. Background technique [0002] Military-civilian integration of new materials has become a national strategy, and there is an urgent demand for high-end adsorption materials in key national defense projects, high-tech weapons and equipment, medicine, electronics, air and water purification. Pitch-based spherical activated carbon is a kind of coal tar pitch with high softening point (softening point: 240-280°C) as raw material, refined naphthalene as pore-forming agent, and is produced through spheroidization, extraction, oxidation infusion, carbonization and water vapor activation. be made of. It is a carbonaceous adsorption material with a particle size of 0.1-1.5mm, spherical structure, high strength and rich micropore (pore size: 0.4-2nm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/318C01B32/336
CPCC01B32/318C01B32/336
Inventor 詹亮李国俊李才毅罗浩
Owner 湖南曦威新材料有限公司
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