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US 2022/0289574 A1Published application
System and method for producing carbon nanotubes
AssigneeLG Chem, Ltd.
InventorsYon Jee Kim, Kwang Woo Yoon, Og Sin Kim, Se Hyun Kim, Seung Yong Lee
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Abstract
In the present invention, only low-growth carbon nanotubes are selectively separated among solid particles discharged during a reaction and then re-input to a reactor, so that it is possible to improve the quality of a carbon nanotube product to be produced and the productivity of a carbon nanotube production process.
Claims11
A system for producing carbon nanotubes, the system comprising:
- a fluidized bed reactor provided with an internal space in which a carbon nanotube synthesis reaction is performed and a discharge unit for discharging a mixed gas containing solid particles;
- a separation unit for receiving the mixed gas connected to the discharge unit and for separating the solid particles in the mixed gas according to the particle diameter thereof;
- and
- a re-input unit for re-inputting carbon nanotubes having a particle diameter of equal to or less than a predetermined particle diameter among the particles separated at the separation unit to the fluidized bed reactor.
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A method for producing carbon nanotubes, the method comprising:
- (S1) reacting a catalyst and a reaction gas containing a carbon source gas and a flowing gas in a fluidized bed reactor to obtain carbon nanotube solid particles;
- (S2) collecting a mixed gas discharged out of the reactor during Step S1 into a separation unit provided outside the fluidized bed reactor and separating the solid particles in the mixed gas;
- and
- (S3) separating the separated solid particles according to the size thereof, and re-inputting particles having a particle diameter of equal to or less than a predetermined particle diameter to the fluidized bed reactor and obtaining particles having a particle diameter of greater than the predetermined particle diameter as a product, wherein the predetermined particle diameter is 50 to 500 μm, and the bulk density of the solid particles separated in Step S2 is 20 kg/m3 or less.
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Dependencies are inferred from the claim text.