Apparatus for continuously producing carbon nanotubes

Patent metadata

Field	Value
Publication number	US-2021188643-A1
Application number	US-202016923092-A
Country	US
Kind code	A1
Filing date	Jul 8, 2020
Priority date	Dec 19, 2019
Publication date	Jun 24, 2021
Grant date	—

Abstract

The present disclosure provides an apparatus capable of continuously producing carbon nanotubes having high crystallinity, a low residual catalyst content and a high aspect ratio. The apparatus for producing carbon nanotubes includes: a reaction unit configured to synthesize carbon nanotubes (CNTs), a supply unit configured to supply a carbon source to the reaction unit through a supply pipe; and a collection unit configured to collect carbon nanotubes discharged from the reaction unit, wherein the reaction unit may include a chemical vapor deposition reactor.

First claim

What is claimed is:

1 . An apparatus for producing carbon nanotubes comprising:
a reaction unit in which carbon nanotubes (CNTs) are synthesized; a supply unit configured to supply a carbon source to the reaction unit through a supply pipe; and a collection unit configured to collect carbon nanotubes discharged from the reaction unit, wherein the reaction unit comprises a chemical vapor deposition reactor.

2 . The apparatus of claim 1 , wherein the supply unit comprises:
a first supply pipe for supplying the carbon source; a second supply pipe for supplying a catalyst; and a third supply pipe for introducing a reaction gas, supplied from the first supply pipe and the second pipe, into the reaction unit.

3 . The apparatus of claim 1 , wherein the reaction unit comprises:
a nozzle member communicating with the supply pipe; a reaction tube, into one end of which the nozzle member is inserted, the reaction tube being formed to have a predetermined length along an insertion direction of the nozzle and providing a space in which the carbon nanotubes are synthesized from the carbon source supplied through the nozzle member; and a chamber formed to have a predetermined length outside the reaction tube and configured to supply heat to the reaction tube to form a reaction area within the reaction tube.

4 . The apparatus of claim 3 , wherein a distance between the end of the nozzle member that is inserted into the reaction tube and the reaction area is 30 mm to 80 mm.

5 . The apparatus of claim 3 , wherein the nozzle member is inserted into the reaction tube to a depth of 250 mm to 300 mm.

6 . The apparatus of claim 3 , wherein the nozzle member is inserted to a predetermined depth from one end of the reaction tube so that the end thereof is located in a space where a laminar flow is formed in the reaction tube.

7 . The apparatus of claim 3 , wherein, when a temperature of the reaction area is 1,100° C. to 1,300° C., a temperature of the end of the nozzle member is 850° C. to 1,000° C.

8 . The apparatus of claim 3 , wherein the nozzle member has an inner diameter of 2 mm to 7 mm.

9 . The apparatus of claim 3 , wherein the nozzle member comprises an alumina tube.

10 . The apparatus of claim 3 , wherein a plurality of the nozzle members is inserted into the reaction tube.

11 . The apparatus of claim 10 , wherein the plurality of nozzle members is inserted by individually adjusting an insertion length of each of the nozzle members or a distance between an end of each of the nozzle members and the reaction area.

12 . The apparatus of claim 3 , wherein the reaction tube comprises a horizontal reaction tube.

13 . The apparatus of claim 3 , wherein the chamber comprises:
a housing comprising a heat insulating material; a partition dividing an interior space of the housing into a plurality of spaces; and a heating member provided in the plurality of spaces and configured to apply heat to the reaction tube.

14 . The apparatus of claim 3 , wherein the reaction unit further comprises a cooling member provided outside one end of the reaction tube into which the nozzle member is inserted, the cooling member being configured to cool heat generated from the carbon source flowing through the nozzle member.

15 . The apparatus of claim 14 , wherein the reaction unit further comprises a heating tape provided between the cooling member and the chamber outside the reaction tube.

16 . The apparatus of claim 1 , wherein the collection unit comprises a filter member connected to the reaction unit and configured to collect the synthesized carbon nanotubes discharged from the reaction unit while allowing unreacted material to pass therethrough.

17 . Carbon nanotubes produced using the apparatus for producing carbon nanotubes according to claim 1 ,
wherein the carbon nanotubes have a Raman peak intensity ratio (I G /I D ) of 50 or more, an aspect ratio of 17,000 or more, and a residual catalyst content of less than 10 wt %.

Assignees

• Korea Inst Sci & Tech

Inventors

• Kim Seung Min
• Lee Sung Hyun
• Park Jun Beom
• Park Ji Hong
• Lee Dong Myeong
• Moon Sook Young
• Jeong Hyeon Su

Classifications

• C01P2006/80

  Compositional purity · CPC title

• B01J19/2415

  Tubular reactors · CPC title

• C01P2002/00

  Crystal-structural characteristics · CPC title

• C01P2004/54

  Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title

• C01B32/164 Primary

  involving continuous processes · CPC title