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

Method used

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  • Method for preparing starch-based carbon microsphere

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Example 1

[0013] In the heating furnace, in the air atmosphere, add 13.5g of corn starch (spherical or polygonal), after the heating furnace is raised to 120℃ at a heating rate of 0.5℃ / min, constant temperature oxidation treatment for 48h; then the oxidation treatment After adding the starch to the carbonization furnace, in the N 2 Under protection, the nitrogen flow rate is 25ml / min, the carbonization furnace is heated to 600℃ at a heating rate of 2℃ / min, and after constant temperature for 2h, the carbonization furnace is cooled to room temperature at a rate of 0.2℃ / 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 ​​the carbon microspheres measured by the BET method is 350.3m 2 / g; true density is 1.591g / cm 3 .

Example Embodiment

[0014] Example 2

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

Example Embodiment

[0016] Example 3

[0017] In the heating furnace, add 20.0g corn starch (in spherical or polygonal shape) in the air atmosphere, raise the heating furnace to 260℃ at a heating rate of 20℃ / min, and then conduct constant-temperature oxidation treatment for 12h; then it will undergo oxidation treatment After adding the starch to the carbonization furnace, in the N 2 Under protection, the nitrogen flow rate is 40ml / min, the carbonization furnace is heated to 2600°C at a temperature increase rate of 10°C / min, and after constant temperature for 1 hour, the carbonization furnace is cooled to room temperature at a rate of 20°C / min to obtain an average particle size of 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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