Method for producing nanocarbon and catalytic reaction device for producing nanocarbon

Patent metadata

Field	Value
Publication number	US-9403682-B2
Application number	US-26421508-A
Country	US
Kind code	B2
Filing date	Nov 3, 2008
Priority date	Apr 12, 2005
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A cylindrical screw feeder main body, catalyst feeding portions for introducing a catalyst into the screw feeder main body, low hydrocarbon feeding portions for introducing a low hydrocarbon into the screw feeder main body as a raw material, a screw for conveying the catalyst and nanocarbon produced by pyrolysis of the low hydrocarbon in the feeder main body, a solid matter discharging portion for discharging the catalyst and the nanocarbon conveyed by the screw out of the screw feeder main body and a gas discharging portion for discharging the unreacted low hydrocarbon and hydrogen produced by the pyrolysis of the low hydrocarbon out of the screw feeder main body are provided. Nanocarbon grown with the catalyst as top with time is continuously discharged out of the screw feeder main body while unused catalyst is being fed thereto at the same amount as that of nanocarbon, allowing efficient continuous reaction.

First claim

What is claimed is:

1. A nanocarbon producing reactor comprising:
a cylindrical screw feeder main body as a pressure reaction vessel;
a catalyst feeding portion for introducing a catalyst into the screw feeder main body;
low hydrocarbon feeding means for introducing a low hydrocarbon into the screw feeder main body as a raw material gas in a space velocity value of 1,000 to 500,000 ml/g-catal./h;
at least one screw rotatably provided in the screw feeder main body for conveying the catalyst and nanocarbon produced by pyrolysis of the low hydrocarbon in the feeder main body;
a solid matter discharging portion provided in the screw feeder main body for discharging the catalyst and the nanocarbon conveyed by the at least one screw out of the screw feeder main body;
a pressure adjusting unit for adjusting the pressure in the screw feeder main body to 10 atm or less;
a gas discharging portion provided in the screw feeder main body for discharging an unreacted low hydrocarbon and hydrogen produced by the pyrolysis of the low hydrocarbon out of the screw feeder main body; and
at least one external motor being connected to the at least one screw,
wherein the at least one external motor is configured to operate the at least one screw back and forth,
wherein the at least one screw rotatably provided in the screw feeder main body comprises a shaft to which screw blades are attached, and
wherein the at least one screw is configured to rotate so as to simultaneously convey the catalyst and substantially all of the nanocarbon produced.

2. The nanocarbon producing reactor according to claim 1 , wherein the catalyst feeding portion comprises a catalyst constant rate feeding device which is capable of feeding a catalyst into the screw feeder main body at a constant rate per unit time.

3. The nanocarbon producing reactor according to claim 1 , further comprising:
a separating/recovering device for separating and recovering the nanocarbon discharged out of the solid matter discharging portion; and
a gas feeding channel for feeding the unreacted low hydrocarbon and hydrogen discharged out of the gas discharging portion into a subsequent step.

4. The nanocarbon producing reactor according to claim 1 , further comprising:
a heating unit for adjusting the temperature in the screw feeder main body;
and
a flow rate adjusting unit for adjusting the flow rate of the low hydrocarbon to be fed into the screw feeder main body.

5. The nanocarbon producing reactor according to claim 1 , wherein the at least one screw comprises:
a through-hole provided in the center of the shaft of the at least one screw; and
a small hole connected to the through-hole and provided in a pitch of teeth of the at least one screw, and
whereby the raw material gas is ejected through the small hole from one end of the through hole.

6. The nanocarbon producing reactor according to claim 1 , wherein the at least one screw and the screw feeder main body are disposed vertically or horizontally in the longitudinal direction.

7. The nanocarbon producing reactor according to claim 1 , wherein the at least one screw has a wider or narrower pitch and a greater or smaller height toward the forward end and one said screw or a plurality of said screws are provided in the reactor.

8. The nanocarbon producing reactor according to claim 1 , wherein the introduction of the catalyst and the low hydrocarbon into the screw feeder main body are through separate portions of the screw feeder main body.

9. The nanocarbon producing reactor according to claim 3 , wherein hydrogen and the unreacted low hydrocarbon are separated and recovered in the subsequent step.

10. The nanocarbon reactor according to claim 5 , wherein the raw material gas comprises a low hydrocarbon or recovered low hydrocarbon gas.

11. A nanocarbon producing reactor comprising:
a cylindrical screw feeder main body as a pressure reaction vessel;
a catalyst feeding portion for introducing a catalyst into the screw feeder main body;
a low hydrocarbon feeding portion for introducing a low hydrocarbon into the screw feeder main body as a raw material gas;
at least one screw rotatably provided in the screw feeder main body for conveying the catalyst and nanocarbon produced by pyrolysis of the low hydrocarbon in the feeder main body;
a solid matter discharging portion provided in the screw feeder main body for discharging the catalyst and the nanocarbon conveyed by the at least one screw out of the screw feeder main body; and
a gas discharging portion provided in the screw feeder main body for discharging an unreacted low hydrocarbon and hydrogen produced by the pyrolysis of the low hydrocarbon out of the screw feeder main body,
wherein the at least one screw rotatably provided in the screw feeder main body comprises a shaft to which screw blades are attached,
wherein the at least one screw is configured to rotate so as to simultaneously convey the catalyst and substantially all of the nanocarbon produced, and
wherein the at least one screw and the screw feeder main body have a combined cross-sectional shape defined by Reuleaux's curve of constant width.

12. A nanocarbon producing reactor comprising:
a single screw feeder main body as a pressure reaction vessel;
a heating unit surrounding the screw feeder main body and configured to adjust the temperature in the screw feeder main body;
a catalyst feeding portion for introducing a catalyst into the screw feeder main body;
low hydrocarbon feeding means for introducing a low hydrocarbon into the screw feeder main body as a raw material gas in a space velocity value of 1,000 to 500,000 ml/g-catal./h;
a single screw rotatably provided in the screw feeder main body for conveying the catalyst and nanocarbon produced by pyrolysis of the low hydrocarbon in the feeder main body by applying heat from the heating unit;
a solid matter discharging portion provided in the screw feeder main body for discharging the catalyst and the nanocarbon conveyed by the screw out of the screw feeder main body;
a pressure adjusting unit for adjusting the pressure in the screw feeder main body to 10 atm or less; and
a gas discharging portion provided in the screw feeder main body for discharging an unreacted low hydrocarbon and hydrogen produced by the pyrolysis of the low hydrocarbon out of the screw feeder main body,
wherein the screw rotatably provided in the screw feeder main body comprises a shaft to which screw blades are attached,
wherein the screw is configured to rotate so as to simultaneously convey the catalyst and substantially all of the nanocarbon produced, and
wherein the screw shares an axis in common with the screw feeder main body.

Assignees

• Tada Akio
• Nakamura Satoru
• Nakamura Tetsunari
• Kakihara Hajime
• Togo Yoshitaka
• Koseki Kikuo
• Takasuna Hiroyuki
• Nat Univ Corp Kitami Inst Of Tech
• Japan Steel Works Ltd
• Kajima Corp

Inventors

• Tada Akio
• Nakamura Satoru
• Nakamura Tetsunari
• Kakihara Hajime
• Togo Yoshitaka
• Koseki Kikuo
• Takasuna Hiroyuki

Classifications

• B01J6/008 Primary

  Pyrolysis reactions (of hydrocarbons C10G9/00) · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• Y10S977/842

  for carbon nanotubes or fullerenes · CPC title

• B01J35/02

  Operations & Transport · mapped topic

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title