Regeneration of an aqueous solution from an acid gas...

Gas separation: processes – Liquid contacting – And degasification of a liquid

Reexamination Certificate

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C095S163000, C095S172000, C095S191000, C095S192000, C095S207000, C095S208000, C095S235000, C095S236000, C096S234000

Reexamination Certificate

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07901487

ABSTRACT:
An acid gas such as carbon dioxide, hydrogen sulfide, or a mixture thereof is removed from gaseous streams using aqueous absorption and stripping processes. By replacing the conventional stripper used to regenerate the aqueous solvent and capture the acid gas with a multipressure stripper (51) that combines acid gas compression with stripping, less energy is consumed. The multipressure stripper is a multistage flash (52, 55, 59) in which the total vapor flow from each stage is compressed and fed to the bottom of the previous flash stage at a higher pressure. In this process, the heat in the water content of the vapor exiting each stage is utilized at a higher pressure in the previous stage. The described stripping process generates the acid gas at a higher pressure without operating the stripper at a higher temperature, thereby reducing the energy consumption of the system.

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