US 12,448,290 B2
Method for producing tetrafluoromethane through plasma pyrolysis of waste polytetrafluoroethylene
Qiwei Yang, Zhejiang (CN); Wenjun Zhang, Zhejiang (CN); Qilong Ren, Zhejiang (CN); Liyang Zhou, Zhejiang (CN); Shuhua Wang, Zhejiang (CN); Wei Qin, Zhejiang (CN); Hongfeng Li, Zhejiang (CN); Zhiguo Zhang, Zhejiang (CN); Zongbi Bao, Zhejiang (CN); and Baogen Su, Zhejiang (CN)
Assigned to ZHEJIANG UNIVERSITY, Zhejiang (CN); and ZHEJIANG JUHUA NEW MATERIAL RESEARCH INSTITUTE CO., LTD., Zhejiang (CN)
Appl. No. 18/856,520
Filed by ZHEJIANG UNIVERSITY, Zhejiang (CN); and ZHEJIANG JUHUA NEW MATERIAL RESEARCH INSTITUTE CO., LTD., Zhejiang (CN)
PCT Filed Jan. 25, 2024, PCT No. PCT/CN2024/073919
§ 371(c)(1), (2) Date Oct. 11, 2024,
PCT Pub. No. WO2025/030788, PCT Pub. Date Feb. 13, 2025.
Claims priority of application No. 202310984261.0 (CN), filed on Aug. 7, 2023.
Prior Publication US 2025/0171306 A1, May 29, 2025
Int. Cl. C01B 32/10 (2017.01); C08J 11/12 (2006.01)
CPC C01B 32/10 (2017.08) [C08J 11/12 (2013.01); C08J 2499/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method for producing tetrafluoromethane through plasma pyrolysis of waste polytetrafluoroethylene (PTFE), comprising the following steps:
subjecting the waste PTFE to a plasma pyrolysis reaction to obtain a pyrolysis product,
subjecting the pyrolysis product to quenching and gas-solid separation in sequence to obtain a pyrolysis gas comprising the tetrafluoromethane; and
subjecting the pyrolysis gas to adsorption and rectification to obtain the tetrafluoromethane;
wherein, the plasma pyrolysis reaction is performed at a temperature of 2,000 K to 4,500 K;
wherein, the plasma pyrolysis reaction is conducted in a plasma reactor;
wherein, the plasma reactor is selected from the group consisting of a radio frequency plasma reactor, a microwave plasma reactor, and an arc plasma reactor;
wherein, the waste PTFE is introduced into the plasma reactor through a carrier gas; and
wherein, the waste PTFE is in a form of a granular material.