Regeneration method and application of nitrogen-containing carbon catalyst

Patent metadata

Field	Value
Publication number	US-12440829-B2
Application number	US-202017622716-A
Country	US
Kind code	B2
Filing date	Nov 26, 2020
Priority date	Jan 7, 2020
Publication date	Oct 14, 2025
Grant date	Oct 14, 2025

Abstract

A regeneration method of a nitrogen-containing carbon catalyst includes the following steps: roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to obtain a regenerated nitrogen-containing carbon catalyst. The method is a universal method, which is suitable for nitrogen-doped carbon catalysts and can be used to regenerate a nitrogen-containing carbon catalyst for producing vinyl chloride (VC) through 1,2-dichloroethane cracking. The method can greatly reduce the production cost of the catalyst and increase the service life of the catalyst, and a regeneration process thereof is fast, simple, and controllable, and does not require high temperatures.

First claim

What is claimed is:

1. A regeneration method of a nitrogen-containing carbon catalyst, comprising:
roasting the nitrogen-containing carbon catalyst in a nitrogen-containing atmosphere to obtain a treated nitrogen-containing carbon catalyst, wherein the nitrogen-containing atmosphere is a mixed gas composed of a first gas and a second gas, the first gas is at least one from the group consisting of ammonia and N 2 O, the second gas is an inert gas, and a mass fraction of the first gas in the mixed gas is less than or equal to 25%;
then switching the nitrogen-containing atmosphere to an inert atmosphere; and
cooling the treated nitrogen-containing carbon catalyst in the inert atmosphere to obtain a regenerated nitrogen-containing carbon catalyst.

2. The method according to claim 1 , wherein the nitrogen-containing carbon catalyst comprises a nitrogen-doped carbon catalyst; in the nitrogen-containing carbon catalyst, a nitrogen element is doped in a carbon material through a covalent bond; and a mass fraction of the nitrogen element in the nitrogen-containing carbon catalyst is 0.1% to 20%.

3. The method according to claim 1 , wherein a process of the roasting comprises: heating to a highest temperature of 300° C. to 850° C. at a heating rate of 0.1° C./min to 20° C./min, and keeping at the highest temperature for 0 min to 240 min.

4. The method according to claim 1 , wherein a process of the roasting comprises: heating to a highest temperature of 300° C. to 800° C. at a heating rate of 0.1° C./min to 10° C./min, and keeping at the highest temperature for 0 min to 90 min.

5. The method according to claim 1 , wherein nitrogen in the nitrogen-containing atmosphere is derived from the first gas.

6. The method according to claim 1 , wherein the inert atmosphere is at least one from the group consisting of nitrogen, argon, and helium.

7. The method according to claim 1 , wherein after the nitrogen-containing carbon catalyst is roasted in the nitrogen-containing atmosphere, a nitrogen content of the treated nitrogen-containing carbon catalyst compared to the nitrogen-containing carbon catalyst is increased by 300 to 15000.

8. A method for producing VC through 1,2-dichloroethane cracking, comprising the following steps:
vaporizing 1,2-dichloroethane to obtain vaporized 1,2-dichloroethane, and introducing the vaporized 1,2-dichloroethane into a reactor filled with a nitrogen-containing carbon catalyst;
after the nitrogen-containing carbon catalyst is deactivated, switching a 1,2-dichloroethane-containing reaction atmosphere to a nitrogen-containing atmosphere for regeneration; and
after the regeneration is completed, switching the nitrogen-containing atmosphere back to the 1,2-dichloroethane-containing reaction atmosphere.

Assignees

• Dalian Inst Chem & Physics Cas
• Formosa Plastics Corp

Inventors

• Fan Sisi
• Xu Jinming
• Huang Yanqiang
• Duan Hongmin
• Zhang Tao
• Cheng Ming-Hung
• Hung Wan-Tun
• Chen Yu-Cheng
• Wu Chien-Hui
• Cheng Ya-Wen
• Wen Ming-Hsien
• Chang Chao-Chin
• Huang Tsao-Cheng
• Yeh Lu-Chen

Classifications

• C07C2527/24

  Nitrogen compounds · CPC title

• C07C21/06

  Vinyl chloride · CPC title

• C07C17/25

  by splitting-off hydrogen halides from halogenated hydrocarbons · CPC title

• B01J38/08

  using ammonia or derivatives thereof · CPC title

• B01J38/02

  Heat treatment · CPC title