Carbon nanotube production method and carbon nanotube production system

Patent metadata

Field	Value
Publication number	US-2025376378-A1
Application number	US-202218878109-A
Country	US
Kind code	A1
Filing date	Jul 15, 2022
Priority date	Jul 15, 2022
Publication date	Dec 11, 2025
Grant date	—

Abstract

A carbon nanotube production method according to the present disclosure includes a carbon dioxide recovery process of recovering carbon dioxide from air by using energy, a reaction process of generating a hydrocarbon by using the recovered carbon dioxide, and a carbon nanotube synthesis process of generating a carbon nanotube by using the hydrocarbon as a raw material.

First claim

What is claimed is:

1 . A carbon nanotube production method comprising:
a recovery step of recovering carbon dioxide from air by using energy; a hydrocarbon generation step of generating a hydrocarbon by using the recovered carbon dioxide; and a carbon nanotube generation step of generating a carbon nanotube by using the hydrocarbon as a raw material.

2 . The carbon nanotube production method according to claim 1 ,
wherein the hydrocarbon generation step includes: a co-electrolysis step of generating carbon monoxide from the carbon dioxide by using solid oxide; and a reaction step of generating the hydrocarbon from the carbon monoxide by using a Fischer-Tropsch method.

3 . The carbon nanotube production method according to claim 2 ,
wherein at least a part of waste heat obtained in the reaction step is used in at least the co-electrolysis step and/or the carbon nanotube generation step.

4 . The carbon nanotube production method according to claim 2 ,
wherein an off-gas of hydrogen generated in the reaction step is used in the co-electrolysis step.

5 . The carbon nanotube production method according to claim 2 ,
wherein water used in the co-electrolysis step is preheated in the reaction step.

6 . The carbon nanotube production method according to claim 2 ,
wherein water used in the carbon nanotube generation step is preheated in the reaction step.

7 . The carbon nanotube production method according to claim 2 ,
wherein water generated in the reaction step is used in the carbon nanotube generation step.

8 . The carbon nanotube production method according to claim 1 ,
wherein the hydrocarbon generation step includes: a methane generation step of generating methane from the carbon dioxide; and an acetylene generation step of generating acetylene from the methane, and in the carbon nanotube generation step, the carbon nanotube is generated by using the acetylene as a raw material.

9 . The carbon nanotube production method according to claim 8 ,
wherein water generated in the methane generation step is used in the carbon nanotube generation step.

10 . The carbon nanotube production method according to claim 1 ,
wherein, in the carbon nanotube generation step, the carbon nanotube is generated by using a chemical vapor deposition method in which water is added along with the hydrocarbon.

11 . A carbon nanotube production system comprising:
a carbon dioxide recovery system configured to recover carbon dioxide from air by using energy; a hydrocarbon generation system configured to generate a hydrocarbon by using the carbon dioxide recovered by the carbon dioxide recovery system; and a carbon nanotube generation device configured to generate a carbon nanotube by using the hydrocarbon as a raw material.

12 . The carbon nanotube production system according to claim 11 ,
wherein the hydrocarbon generation system includes: a co-electrolysis device configured to generate carbon monoxide from the carbon dioxide by using solid oxide; and a reactor configured to generate the hydrocarbon from the carbon monoxide by using a Fischer-Tropsch method.

13 . The carbon nanotube production system according to claim 11 ,
wherein the hydrocarbon generation system includes: a methane generation device configured to generate methane from the carbon dioxide; and an acetylene generation device configured to generate acetylene from the methane, and the carbon nanotube generation device generates the carbon nanotube by using the acetylene as a raw material.

Assignees

• Mitsubishi Electric Corp

Inventors

• Onaka Yoji
• Tanishima Makoto
• Shinoki Toshio
• Kawamoto Makoto
• Nakashima Seiji
• Fukui Tomoya
• Inoue Takumi

Classifications

• C23C16/448

  characterised by the method used for generating reactive gas streams, e.g. by evaporation or sublimation of precursor materials · CPC title

• C23C16/26

  Deposition of carbon only · CPC title

• C07C1/12

  from carbon dioxide with hydrogen · CPC title

• C25B1/23

  Carbon monoxide or syngas · CPC title

• C25B15/081

  Supplying products to non-electrochemical reactors that are combined with the electrochemical cell, e.g. Sabatier reactor · CPC title