Cnt purification method using fluidized bed reactor

A fluidized bed reactor and purification method technology, applied in the field of carbon nanotube purification, can solve the problems of reducing product production, environmental pollution, waste acid treatment, etc., and achieve the effect of shortening the time

Inactive Publication Date: 2017-08-29
LG CHEM LTD
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Problems solved by technology

[0005] Specifically, the metal removal method using the liquid acid may generate waste acid as a by-product, which may cause problems such as environmental pollution and waste acid disposal.
In addition, the disadvantage of the metal removal method using a heating furnace is that the product throughput is reduced because raw materials such as cooling gas and time are consumed in the heating and cooling of the heating furnace.

Method used

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  • Cnt purification method using fluidized bed reactor
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  • Cnt purification method using fluidized bed reactor

Examples

Experimental program
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Effect test

preparation example 1

[0076]Preparation Example 1: Preparation of Carbon Nanotubes (CNTs)

[0077] Carbon nanotube synthesis experiments were carried out using metal catalysts containing Co / Fe / Mo / V / Al for CNT synthesis in a laboratory-scale fluidized bed reactor. Specifically, the CNT synthesis catalyst and CNT prepared in the above process are mixed and installed in the middle of a quartz tube with an inner diameter of 55 mm, then, under a nitrogen atmosphere, the temperature is raised to 700 ° C and the temperature is maintained, and nitrogen and Ethylene and hydrogen were respectively flowed in at a flow rate of 900 sccm and synthesized for 2 hours to synthesize entangled (non-bundled) carbon nanotube aggregates. Photographs of the fabricated CNTs are shown in figure 2 And in the preparation example 1.

Embodiment 1 to 2 and comparative example 1

[0078] Examples 1 to 2 and Comparative Example 1: Purification of carbon nanotubes

Embodiment 1

[0080] 20 g of the carbon nanotubes prepared in Preparation Example 1 were placed in a fluidized bed reactor. Inject N at a flow rate of 1000 sccm 2 , and the internal temperature of the reactor was raised to 900 °C. Then, the Cl 2 and N 2 A 1:1 ratio of halogen-containing gas was supplied at a flow rate of 1000 sccm for 30 minutes.

[0081] Then, after injecting only N 2 Afterwards, the sample was transferred to the second high-temperature reactor at 1200 °C, followed by N 2 The flow condition of the gas atmosphere was maintained for 30 minutes and then cooled. For photos of CNTs that have passed through this process figure 2 A photographic representation of Example 1.

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Abstract

The present invention relates to a CNT purification method wherein carbon nanotubes containing impurities including residual metal are subjected to a reaction with halogen-containing gas under an inert gas atmosphere in a fluidized bed reactor, so as to remove the impurities. The method according to the present invention can operate the reactor at a higher density, as compared to a conventional CNT purification method using a heating furnace, by using a flow condition and a sealing condition in combination, and can thus effectively purify CNTs from impurities such as a metal catalyst within the CNTs while reducing the time required for the CNT purification process.

Description

technical field [0001] This application claims priority based on Korean Patent Application No. 10-2015-0147657 filed on October 23, 2015, and the entire contents disclosed in the Korean Patent Application Document are incorporated herein by reference. [0002] The invention relates to a method for purifying carbon nanotubes (CNT) using a fluidized bed reactor. Background technique [0003] CNT is often used as a conductive additive in electronic products such as batteries or conductive inks and conductive polymers. In the case of fine chemical products, when impurities other than CNT are added, the quality of the product will be lowered and unexpected problems will occur. Therefore, in CNT synthesis, it is very important to remove impurities such as residual metal catalysts or amorphous carbon that may be produced in the CTN synthesis process in order to improve the quality of the product. In particular, only by removing the metal catalyst can problems related to quality a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/17B01J8/24
CPCB01J8/24
Inventor 金昱营姜京延曹东铉
Owner LG CHEM LTD
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