CN1488575A - Nano carbon laser-induced preparing method - Google Patents
Nano carbon laser-induced preparing method Download PDFInfo
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- CN1488575A CN1488575A CNA031282687A CN03128268A CN1488575A CN 1488575 A CN1488575 A CN 1488575A CN A031282687 A CNA031282687 A CN A031282687A CN 03128268 A CN03128268 A CN 03128268A CN 1488575 A CN1488575 A CN 1488575A
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- laser
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Abstract
The invention refers to laser induction producing method for nano charcoal. The invention puts hydrocarbon or olefin into reaction furnace, and heats them until they are decomposed into nano charcoal. The grain rate of the charcoal is thin, the grain diameter can be controlled and the purity is high. The average grain diameter is 200nm, the main phase content is above 99%, the content of heavy metal meets the national standard.
Description
The technical field is as follows:
the invention relates to a preparation method of carbon powder, in particular to a laser-induced preparation method of nano carbon.
(II) background technology:
the traditional method for preparing carbon powder comprises two methods of chemical reaction and mechanical pulverization. The chemical reaction method is to produce carbon powder by incomplete combustion or cracking of many hydrocarbons, the microcrystal of which has quasi-graphite structure and is concentrically oriented, and the particles are almost spherical colloid particles, and most of the particles are melted into aggregates, and carbon powder with different purposes can be obtained by controlling the process conditions such as reaction temperature, etc., and because petroleum products are used for cracking, the carbon powder contains more impurities. The mechanical pulverization method is to pulverize the coarse carbon particles to the required particle size by a mechanical method, but the method for preparing the nano carbon has the defects of low efficiency, wide particle size distribution and difficult classification. The preparation method of nano carbon currently comprises a furnace method, a tank method, a thermal cracking method, a lampblack method and the like, and carbon powder produced by each method has specific physicochemical properties which are closely related to raw materials used, a fuel cracking process, a production mode and process operation conditions.
(III) the invention content:
the invention solves the defect of low purity of the nano-carbon produced by the existing production method, and provides the laser-induced preparation method of the nano-carbon with controllable particle size, narrow particle size distribution and high product purity.
The method of the invention comprises the following steps: hydrocarbon or olefin substances are placed in a reaction furnace and heated until the substances are heated and decomposed to generate nano carbon.
The nano carbon produced by the method has the characteristics of narrow particle size distribution, controllable particle size and high purity, the average particle size of the produced nano carbon is 200nm, the main phase content is more than 99.0 percent, and various indexes such as heavy metal content and the like all reach the national standard of medicinal carbon. The properties of the nano-carbon prepared by the method reach the requirements for preparing nano-carbon suspension injection. All indexes of the Chinese medicine are superior to the national standard in the 2000 edition of Chinese pharmacopoeia.
(IV) specific embodiment:
the specific process flow of the invention is as follows: vacuumizing the reaction furnace; heating the reaction furnace by laser; introducing hydrocarbon or olefin into the reaction furnace, wherein acetylene gas is the best; hydrocarbon or olefin substances are heated and decomposed in a reaction furnace to generate nano carbon; then cooling the reaction furnace; collecting the nano carbon.
Example 1:
(1) vacuumizing the reaction furnace, closing the electromagnetic valve when the vacuum degree is less than 5Pa, and stopping vacuumizing;
(2) adjusting the laser power to be 1-3.0KW under the condition that the vacuum degree is less than 5Pa, heating the reaction furnace by using laser, and when the furnace temperature of the reaction furnace reaches 1100-1800 ℃;
(3) introducing acetylene gas into the reaction furnace;
(4) maintaining the acetylene inlet pressure at 0-1000 Pa;
(5) opening the multi-direction supersonic airflow device, introducing argon, cooling the nano carbon powder to acertain temperature, dispersing, and transferring to an output furnace;
(6) collecting the nano carbon particles to obtain 30-300 controllable nano carbon.
(7) The acetylene cracking reaction is an endothermic reaction, the laser is continuously heated outside the reaction furnace, and the temperature in the reaction furnace is controlled at 1100-1800 ℃. The temperature exceeds 1800 ℃, and the nano carbon becomes a graphite structure. Acetylene cracking is utilized to produce nano carbon in a laser reaction system, and the reaction formula is as follows:
Claims (7)
1. a laser-induced preparation method of nano-carbon is characterized by comprising the following steps: hydrocarbon or olefin substances are placed in a reaction furnace and heated until the substances are heated and decomposed to generate nano carbon.
2. The laser-induced preparation method of nanocarbon according to claim 1, characterized in that: vacuumizing the reaction furnace; heating the reaction furnace by laser; introducing hydrocarbon or olefin into the reaction furnace, wherein acetylene gas is the best; hydrocarbon or olefin substances are heated and decomposed in a reaction furnace to generate nano carbon; then cooling the reaction furnace; collecting the nano carbon.
3. The laser-induced preparation method of nanocarbon according to claim 2, characterized in that: and when the vacuum degree of the reaction furnace is less than 5Pa, closing the electromagnetic valve and stopping vacuumizing.
4. The laser-induced preparation method of nanocarbon according to claim 3, characterized in that: adjusting the laser power to be 1-3.0KW under the condition that the vacuum degree is less than 5Pa, and heating the reaction furnace by using laser until the furnace temperature of the reaction furnace reaches 1100-1800 ℃.
5. The laser-induced preparation method of nanocarbon according to claim 4, characterized in that: introducing hydrocarbon or olefin substances when the furnace temperature of the reaction furnace reaches 1100-1800 ℃.
6. The laser-induced preparation method of nanocarbon according to claim 5, characterized in that: the inlet pressure of the hydrocarbon or the olefin substance is maintained to be 0-1000 Pa.
7. The laser-induced preparation method of nanocarbon according to claim 6, characterized in that: opening the multi-direction supersonic airflow device, introducing argon, cooling, dispersing and transferring the nano carbon powder out of the furnace to obtain the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031282687A CN1488575A (en) | 2003-06-30 | 2003-06-30 | Nano carbon laser-induced preparing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031282687A CN1488575A (en) | 2003-06-30 | 2003-06-30 | Nano carbon laser-induced preparing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1488575A true CN1488575A (en) | 2004-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031282687A Pending CN1488575A (en) | 2003-06-30 | 2003-06-30 | Nano carbon laser-induced preparing method |
Country Status (1)
| Country | Link |
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| CN (1) | CN1488575A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101209833B (en) * | 2006-12-27 | 2010-09-29 | 清华大学 | Preparation of carbon nano-tube array |
-
2003
- 2003-06-30 CN CNA031282687A patent/CN1488575A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101209833B (en) * | 2006-12-27 | 2010-09-29 | 清华大学 | Preparation of carbon nano-tube array |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |