ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,703,638, issued on Aug. 11, was assigned to Jiangnan Environmental Protection Group Inc. (Grand Cayman, Cayman Islands).
"Multi-stage ammonia-based decarbonization" was invented by Jun Zhang (Nanjing, China), Lifang Qi (Beijing), Jinyong Wang (Nanjing, China) and Jing Luo (Nanjing, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Multi-stage ammonia-based decarbonization, characterized in that ammonia is used as an absorbent to absorb CO2 in a process gas in an absorber, and the absorber may include four or more stages of absorption, where a first-stage absorption, a second-stage absorption, a third-stage absorption, a fourth-stage absorption, and h...