公开(公告)号：US12129566B2

公开(公告)日：2024-10-29

申请号：US17707903

申请日：2022-03-29

申请人： CENTRAL SOUTH UNIVERSITY

发明人： Hui Liu ,  Kaisong Xiang ,  Liyuan Chai ,  Fenghua Shen ,  Xudong Liu ,  Fangfang Zhu ,  Lin Wu ,  Huimin Yi ,  Xiaobo Min ,  Zhang Lin ,  Qingzhu Li ,  Qingwei Wang ,  Haiying Wang ,  Weichun Yang

IPC分类号： C25B9/23 ,  B01D53/50 ,  B01D53/78 ,  C25B1/01 ,  C25B1/50 ,  C25B11/052 ,  C25B11/057 ,  C25B11/075 ,  C25B11/081 ,  C25B15/08

CPC分类号： C25B9/23 ,  B01D53/502 ,  B01D53/78 ,  C25B1/01 ,  C25B1/50 ,  C25B11/052 ,  C25B11/057 ,  C25B11/075 ,  C25B11/081 ,  C25B15/08 ,  B01D2251/306 ,  B01D2251/604

摘要： 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.

公开(公告)号：US11939229B2

公开(公告)日：2024-03-26

申请号：US17990441

申请日：2022-11-18

申请人： Central South University

发明人： Zhang Lin ,  Xu Yan ,  Xueming Liu ,  Fandongkun Meng ,  Yanjie Liang

IPC分类号： C01G3/10 ,  C02F1/52 ,  C02F1/66 ,  C02F1/72 ,  C02F9/00 ,  C02F101/10

CPC分类号： C01G3/10 ,  C02F9/00 ,  C01P2004/03 ,  C02F1/5236 ,  C02F1/66 ,  C02F1/722 ,  C02F2101/10

摘要： The present invention provides a method for treating a copper-containing waste etching solution, which includes: preparing basic copper chloride nanometer seed crystals and synthesizing basic copper chloride mono-crystals; making an acidic waste etching solution subjected to agglomeration reaction with an ammonium-containing solution and slurry containing the basic copper chloride mono-crystals to obtain basic copper chloride crystal particles and copper-removed waste solution; making an alkaline waste etching solution react with sulfuric acid to obtain a copper sulfate mixed solution; and then evaporating, concentrating, cooling and crystallizing the copper sulfate mixed solution obtained by the reaction of the alkaline waste etching solution and the sulfuric acid in sequence to obtain copper sulfate pentahydrate solids. In a case of low investment, the present invention not only can realize the recycling of copper in the copper-containing waste etching solution, but also can obtain various high-value products, and can achieve both environmental and economic benefits.