Method for treating lignin-based material

Patent metadata

Field	Value
Publication number	US-10035957-B2
Application number	US-201615016993-A
Country	US
Kind code	B2
Filing date	Feb 5, 2016
Priority date	Feb 6, 2015
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A method of treating lignin-based material is provided, comprising the steps of subjecting lignin separated from lingo-cellulosic raw material to hydrothermal carbonization process at an elevated temperature, where carbonized lignin having increased carbon content is obtained, and stabilizing the obtained carbonized lignin under inert atmosphere at a stabilization temperature higher than the temperature of the hydrothermal carbonization process.

First claim

What is claimed:

1. A method for treating lignin extracted from lignocellulosic raw material, said method comprising the steps of:
subjecting the lignin extracted from the lignocellulosic raw material to hydrothermal carbonization process at an elevated temperature, where carbonized lignin having increased carbon content is obtained, and
stabilizing the obtained carbonized lignin in a stabilization process under an inert atmosphere at a stabilization temperature higher than the temperature of the hydrothermal carbonization process,
wherein the stabilization process comprises:
raising a temperature from a start temperature to the stabilization temperature, the stabilization temperature being between 300° C. and 600° C.,
holding the obtained carbonized lignin at the stabilization temperature for between 10 minutes and 10 hours, and
converting the obtained carbonized lignin to a permanent stabilized form due to the holding duration at the stabilization temperature.

2. The method according to claim 1 , further comprising:
subjecting the carbonized lignin to heat treatment according to a time-temperature program, and
during the heat treatment, raising the temperature at a rate of 0.1-20° C./min to the stabilization temperature.

3. The method according to claim 1 , further comprising:
subjecting the carbonized lignin to heat treatment according to a time-temperature program, and
during the heat treatment, raising the temperature at a rate of 1-20° C./min to the stabilization temperature.

4. The method according to claim 1 , wherein the carbonized lignin is subjected to mechanical pre-processing before the stabilization.

5. The method according to claim 1 , wherein after the stabilization, the stabilized carbonized lignin is made to final carbon product in finishing processing steps.

6. The method according to claim 5 , wherein the finishing processing steps of the stabilized carbonized lignin include at least one of carbonization to maximal carbon content, or activation.

7. The method according to claim 5 , wherein the finishing processing steps of the stabilized carbonized lignin include mechanical processing.

8. The method according to claim 5 , further comprising using the final carbon product in a functional or constructional application.

9. The method according to claim 6 , further comprising using the final carbon product in a functional or constructional application.

10. The method according to claim 7 , further comprising using the final carbon product in a functional or constructional application.

11. The method according to claim 8 , wherein the final carbon product is used in the production of rubber or elastomer articles, in the production of steel or electrode carbon, or as activated carbon.

12. The method according to claim 9 , wherein the final carbon product is used in the production of rubber or elastomer articles, in the production of steel or electrode carbon, or as activated carbon.

13. The method according to claim 10 , wherein the final carbon product is used in the production of rubber or elastomer articles, in the production of steel or electrode carbon, or as activated carbon.

14. The method according to claim 11 , wherein final carbon product is used in the production of rubber or elastomeric articles, which are tires or belts.

15. The method according to claim 12 , wherein the final carbon product is used in the production of rubber or elastomeric articles, which are tires or belts.

16. The method according to claim 13 , wherein the final carbon product is used in the production of rubber or elastomeric articles, which are tires or belts.

17. The method according to claim 1 , wherein after the stabilization process, the stabilized carbonized lignin is used in constructional applications.

Assignees

• Valmet Technologies Oy

Inventors

• Hilli Tuomo
• Tynjaelae Pekka
• Romar Henrik

Classifications

• C10B53/02 Primary

  of cellulose-containing material (production of pyroligneous acid C10C5/00) · CPC title

• C10L9/086

  Hydrothermal carbonization · CPC title

• C07G1/00

  Low-molecular-weight derivatives of lignin (high-molecular-weight derivatives of lignin {C08H6/00}) · CPC title

• C10L5/442

  Wood or forestry waste · CPC title

• D21C11/0007 Primary

  Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for (volatile compounds obtained by decomposition of spent liquors in order to regenerate them D21C11/125; compounds obtained by fractionating the liquors in order to regenerate them D21C11/0042) · CPC title