Method for preparing hydrogen sulfide from sulfur dioxide by electrochemical reduction

US12129566B2 · kind B2 · utility

Assignee

• CENTRAL SOUTH UNIVERSITY · CN

Inventors

• Hui Liu
• Kaisong Xiang · Changsha, CN
• Liyuan Chai · Changsha, CN
• Fenghua Shen · Changsha, CN
• Xudong Liu · Yongcheng, CN
• Fangfang Zhu · San Jose, US
• Lin Wu · Changsha, CN
• Huimin YI · Changsha, CN
• Xiaobo Min · Changsha, CN
• Zhang Lin · Changsha, CN
• Qingzhu Li · Hunan, CN
• Qingwei Wang · Shandong, CN
• Haiying Wang · Shandong, CN
• Weichun Yang · Changsha, CN

Key dates

• Filing date: Mar 29, 2022
• Grant date: Oct 29, 2024
• Expiry date: Feb 23, 2043

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D2258/0283
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for preparing hydrogen sulfide from sulfur dioxide by electrochemical reduction includes electrochemically reducing sulfur dioxide absorbed in an aqueous solution into gaseous hydrogen sulfide with a membrane electrode, resulting in efficient and selective conversion of the sulfur dioxide absorbed in the aqueous solution into the hydrogen sulfide to avoid a deactivation of a cathode due to colloidal sulfur produced on the cathode and adhesion onto a surface of the cathode, wherein the method is carried out at ambient temperature and normal pressure without addition of a reducing agent, having no waste salts produced, and is simple in operation, and is convenient for large-scale application.