Abstract: Low-cost and energy-efficient CO2 and H2S capture is provided obtaining greater than 99.9% capture efficiency from pressurized gas. The acid species are captured in an ammonia solution, which is then regenerated by stripping the absorbed species. The solution can capture as much as 330 grams of CO2 and H2S per 1000 gram of water and when regenerated it produces pure pressurized acid gas containing more than 99.7% CO2 and H2S. The absorption of the acid species is accomplished in two absorbers in-series, each having multiple stages. More than 95% of the acid species are captured in the first absorber and the balance is captured in the second absorber to below 10 ppm concentration in the outlet gas. The two absorbers operate at temperatures ranging from 20-70 degrees Celsius. The two absorbers and the main stripper of the alkaline solution operate at similar pressures ranging from 5-200 bara.

Abstract: The technical field of the invention is CO2 capture and sequestration, as well as gas separation and purification technologies. In an aspect is a process for capturing purified CO2 from a CO2-containing gas, comprising steps: (a) contacting in an absorber column the CO2-containing gas with an absorption solution comprising water, ammonia, and potassium carbonate, to enable adsorption of CO2, thereby producing a CO2-depleted gas and a CO2-rich solution; and (b) subjecting the CO2-rich solution to desorption conditions in a regeneration column producing a purified CO2 gas stream and a CO2-depleted solution.

Abstract: The technical field of the invention is CO2 capture and sequestration, as well as gas separation and purification technologies. In an aspect is a process for capturing purified CO2 from a CO2-containing gas, comprising steps: (a) contacting in an absorber column the CO2-containing gas with an absorption solution comprising water, ammonia, and potassium carbonate, to enable adsorption of CO2, thereby producing a CO2-depleted gas and a CO2-rich solution; and (b) subjecting the CO2-rich solution to desorption conditions in a regeneration column producing a purified CO2 gas stream and a CO2-depleted solution.

Abstract: Low-cost and energy-efficient C02 and H2S capture is provided obtaining greater than 99.9% capture efficiency from pressurized gas. The acid species are captured in an ammonia solution, which is then regenerated by stripping the absorbed species. The solution can capture as much as 330 grams of C02 and H2S per 1000 gram of water and when regenerated it produces pure pressurized acid gas containing more than 99.7% C02 and H2S. The absorption of the acid species is accomplished in two absorbers in-series, each having multiple stages. More than 95% of the acid species are captured in the first absorber and the balance is captured in the second absorber to below 10 ppm concentration in the outlet gas. The two absorbers operate at temperatures ranging from 20-70 degrees Celsius. The two absorbers and the main stripper of the alkaline solution operate at similar pressures ranging from 5-200 bara.