Tobacco-derived carbon material

Patent metadata

Field	Value
Publication number	US-11219244-B2
Application number	US-201414579409-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 22, 2014
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

A method of forming a carbon material from the stalk or roots of a plant of the Nicotiana species is provided herein, wherein the method includes i) receiving a tobacco material comprising at least one of a stalk material and a root material of a harvested plant of the Nicotiana species; and ii) pyrolyzing the tobacco material to remove volatiles and to form a tobacco-derived carbon material. Optionally, the method can further include activating the tobacco-derived carbon material. The tobacco-derived carbon material can be incorporated into a tobacco product. A carbon material derived from pyrolyzing a tobacco material in the form of at least one of a tobacco stalk material and a tobacco root material of a harvested plant of the Nicotiana species is also provided herein.

First claim

What is claimed is:

1. A method of forming a tobacco product comprising a carbon material derived from the stalk or roots of a plant of the Nicotiana species, comprising:
i) receiving a tobacco material comprising at least one of a stalk material and a root material of a harvested plant of the Nicotiana species;
ii) pyrolyzing the tobacco material to remove volatiles and to form a tobacco-derived carbon material;
iii) activating the tobacco-derived carbon material; and
iv) incorporating the activated tobacco-derived carbon material into a tobacco product, wherein the tobacco product is a smoking article, wherein the smoking article comprises a filter element, and wherein the activated tobacco-derived carbon material is located within the filter element;
wherein the tobacco material comprises at least about 90 percent by dry weight of the root material of a harvested plant of the Nicotiana species; and
wherein the tobacco-derived carbon material comprises an ash content of about 5% or less by dry weight.

2. The method of claim 1 , wherein the tobacco material is formed by grinding at least one of the stalk material and the root material of a harvested plant of the Nicotiana species to form a particulate material.

3. The method of claim 1 , wherein the tobacco material comprises at least 40 dry weight percent carbon.

4. The method of claim 1 , wherein pyrolyzing the tobacco material results in a yield of the tobacco-derived carbon material of about 25 percent or greater based on the initial dry weight of the tobacco material.

5. The method of claim 1 , wherein the tobacco-derived carbon material is activated through at least one of alkali activation and steam activation.

6. The method of claim 5 , wherein the tobacco-derived carbon material is activated by fluxing a tobacco-derived char with an alkali metal compound in a mass ratio of about 1:1 to about 3:1 alkali metal compound/char at a temperature of greater than about 800° C.

7. The method of claim 1 , wherein the activated tobacco-derived carbon material has a surface area of at least about 400 m 2 /g.

8. The method of claim 7 , wherein the activated tobacco-derived carbon material has a surface area of about 500 to about 1,200 m 2 /g.

Assignees

• Reynolds Tobacco Co R

Inventors

• Dube Michael Francis
• Perfetti Thomas Albert
• Lehman Rick
• Horvath Bob

Classifications

• A24D1/08

  with lighting means · CPC title

• C01P2006/12

  Surface area · CPC title

• C01B32/30

  Active carbon · CPC title

• A24D3/06 Primary

  Use of materials for tobacco smoke filters · CPC title

• C01B32/336

  characterised by gaseous activating agents · CPC title