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Method for preparing starch-based carbon microsphere

A carbon microsphere and starch-based technology, which is applied in the field of preparation of starch-based carbon microspheres, can solve the problems of complex process, strict equipment requirements, inability to meet, etc., and achieve the effects of simple production process, low price and wide sources.

Inactive Publication Date: 2008-05-21
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned processes generally have problems such as complex processes and strict requirements on equipment, and the raw materials used are non-renewable resources (such as: petroleum, asphalt, etc.) and organic compounds that seriously pollute the environment, which cannot meet the requirements of "green chemical industry"

Method used

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  • Method for preparing starch-based carbon microsphere

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Embodiment 1

[0013] In the heating furnace, in an air atmosphere, add 13.5g of cornstarch (spherical or polygonal), and raise the heating furnace to 120°C at a heating rate of 0.5°C / min, and perform constant temperature oxidation treatment for 48h; The final starch is added to the carbonization furnace, under N 2 Under protection, the nitrogen flow rate is 25ml / min, and the carbonization furnace is heated to 600°C at a heating rate of 2°C / min. After 2 hours of constant temperature, the carbonization furnace is cooled to room temperature at a rate of 0.2°C / min, and the average particle size is 15μm starch-based carbon microspheres, the yield of carbon microspheres is 21.0%, and the specific surface area of ​​carbon microspheres measured by BET method is 350.3m 2 / g; the true density is 1.591g / cm 3 .

Embodiment 2

[0015] In the heating furnace, add 14.0g of corn starch in an air atmosphere, raise the heating furnace to 180°C at a heating rate of 5°C / min, and perform constant temperature oxidation treatment for 20h; then add the oxidized starch into the carbonization furnace , at N 2 Under protection, the nitrogen flow rate is 50ml / min, and the carbonization furnace is heated to 1000°C at a heating rate of 5°C / min. After constant temperature for 1.5 hours, the carbonization furnace is cooled to room temperature at a rate of 1°C / min, and the average particle size is obtained. Starch-based carbon microspheres of 12 μm, the yield of carbon microspheres is 16.5%, and the specific surface area of ​​carbon microspheres measured by BET method is 110.8m 2 / g; the true density is 1.617g / cm 3 .

Embodiment 3

[0017] In the heating furnace, in an air atmosphere, add 20.0g of cornstarch (spherical or polygonal) and raise the heating furnace to 260°C at a heating rate of 20°C / min, then perform constant temperature oxidation treatment for 12h; The final starch is added to the carbonization furnace, under N 2 Under protection, the nitrogen flow rate is 40ml / min, and the carbonization furnace is heated to 2600°C at a heating rate of 10°C / min. After constant temperature for 1 hour, the carbonization furnace is cooled to room temperature at a rate of 20°C / min, and the average particle size is 10μm starch-based carbon microspheres, the yield of carbon microspheres is 13.4%, and the true density is 1.497g / cm 3 .

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Abstract

The invention discloses a method used for preparing starch-based carbon microsphere, which pertains to the preparation technique of carbon microsphere. The procedure of the method comprises that cereal starch, tuber starch, bean starch and fruit starch of bananas and plantain are used as raw materials with a particle diameter of 2 to 120 micron; the raw materials are put into a heating furnace, heated to 62 to 300 DEG C at a certain heating rate in oxidizing atmosphere (for example, air, oxygen, ozone, etc.) and go through oxidation treatment under constant temperature for 2 to 72 hours. The starch after oxidation is put into a carbonization furnace, heated to 600 DEG C to 3000 DEG C at a certain heating rate under the protection of inert gas, treated for 0.5 to 48 hours at a constant temperature and then cooled to indoor temperature, and the starch-based carbon microsphere which keep original starch particle shape is obtained. The invention has the advantages of reproducible raw materials, wide source, low price, simple preparation process and low production cost, and being easy for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of starch-based carbon microspheres, which belongs to the preparation technology of carbon microspheres. Background technique [0002] Carbon microsphere material is a new type of high-grade carbon material successfully developed by industrially developed countries such as Japan, the United States, the Federal Republic of Germany and the Soviet Union in the late 1970s. According to different raw materials, it can be divided into three categories: coal-based, polymer-based and pitch-based carbon microspheres. At present, the preparation methods of carbon microspheres mainly include: thermal condensation method, emulsion method, direct pyrolysis method, suspension method, arc discharge method, template method, chemical vapor deposition method, etc. The emulsion method uses mesophase pitch as the raw material, which is crushed, poured into high-temperature silicone oil, heated and stirred to form an emulsion,...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 陈明鸣赵朔王成扬时志强
Owner TIANJIN UNIV
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