Abstract: The object of the invention is a method for dissolving carbon dioxide from flue or other gas and for the neutralization of the solution obtained. The gas, in which the partial pressure of carbon dioxide is at least 0.4 bar, is led to a dissolution process, where the major part of the carbon dioxide is dissolved into a flow of water. The aqueous solution of carbon dioxide thus obtained is neutralized by passing it through a material containing feldspar minerals, at which time the hydrogen ions of said solution are replaced by ions of alkali or alkaline earth metals, and the aluminum in said material is converted into aluminum compounds that can be separated and utilized.

Abstract: The object of the invention is a method for dissolving carbon dioxide from flue or other gas and for the neutralization of the solution obtained. The gas, in which the partial pressure of carbon dioxide is at least 0.4 bar, is led to a dissolution process, where the major part of the carbon dioxide is dissolved into a flow of water. The aqueous solution of carbon dioxide thus obtained is neutralized by passing it through a material containing feldspar minerals, at which time the hydrogen ions of said solution are replaced by ions of alkali or alkaline earth metals, and the aluminum in said material is converted into aluminum compounds that can be separated and utilized.

Abstract: The invention relates to a process for producing liquid carbon dioxide (CO2) from combustion gas at normal pressure, in which process the CO2 of combustion gas led to the lower part of an absorption column is absorbed in an absorption solution that flows downwards from its upper part, the CO2-poor combustion gas is removed from the upper part of the absorption column, the said absorption solution is led to the upper part of a desorption column, the CO2 is desorbed from the absorption solution led to the upper part of the desorption column to form a gaseous CO2 concentrate, which is removed from the upper part as the absorption solution flows to the lower part of the column, from which it is re-circulated to the upper part of the absorption column, the CO2 concentrate obtained is brought to a high pressure, and most of the concentrate's CO2 is liquidized.

Abstract: The invention relates to a process for producing oxygen or air enriched with oxygen, in which process: The air entering the process is cooled in a heat exchanger to near to the condensation point of air and the air is led to a separation unit formed of two or more chambers connected thermally to each other and comprising A and B halves, in which it is divided, using liquidization and evaporation processes, into two or more gaseous fractions. The process air is maintained at normal temperature, except for small pressure differences to maintain the flow of the air and to optimize the process.