	US 12,214,343 B2
	Preparation method and preparation system of carbon nanotubes
Og Sin Kim, Daejeon (KR); Uk Yeong Kim, Daejeon (KR); Se Hyun Kim, Daejeon (KR); and Yon Jee Kim, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Appl. No. 17/606,299
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Jul. 29, 2020, PCT No. PCT/KR2020/010017 § 371(c)(1), (2) Date Oct. 25, 2021, PCT Pub. No. WO2021/029579, PCT Pub. Date Feb. 18, 2021.
Claims priority of application No. 10-2019-0097217 (KR), filed on Aug. 9, 2019.
Prior Publication US 2022/0203320 A1, Jun. 30, 2022
Int. Cl. B01J 8/32 (2006.01); B01J 8/00 (2006.01); B82Y 40/00 (2011.01); C01B 32/162 (2017.01)

CPC B01J 8/32 (2013.01) [B01J 8/008 (2013.01); C01B 32/162 (2017.08); B01J 2219/00029 (2013.01); B01J 2219/0059 (2013.01); B01J 2219/00905 (2013.01); B82Y 40/00 (2013.01); C01B 2202/30 (2013.01); C01B 2202/32 (2013.01); C01B 2202/36 (2013.01); C01P 2004/13 (2013.01); C01P 2004/64 (2013.01); C01P 2006/80 (2013.01)]

10 Claims

1. A carbon nanotube preparation method, the method comprising:

a reaction comprising reacting a catalyst and a reaction gas comprising a carbon source gas and a flowing gas in a fluidized bed reactor to produce carbon nanotubes;

capturing a mixture gas produced during, and after finishing, the reaction in a separator provided at the exterior of the fluidized bed reactor, and separating fine particles in the mixture gas; and

injecting the fine particles thus separated as a portion of a bed in the fluidized bed reactor prior to initiating a subsequent reaction,

wherein a weight of the fine particles injected in the bed of the fluidized reactor is 1 to 30% by weight, based on a total weight of the bed and wherein a purity of the fine particles is 85 to 95%.