NOVELTY - Removing acid gas from a gaseous stream includes passing acid gas-rich solvent stream exiting an absorbing equipment through a multi-pressure stripper operated at different pressure levels so that vapor obtained in each flash stage is compressed in a compressor and fed to the previous flash stage at a higher pressure, and recycling an acid gas-lean solvent stream exiting the multi-pressure stripper back to the absorption equipment at least once.    USE - For removing acid gas, e.g. carbon dioxide and/or hydrogen sulfide, from a gaseous stream, e.g. flue gas, natural gas, hydrogen gas, or synthesis gas (claimed).    ADVANTAGE - The inventive method using multi-pressure stripper is more energy efficient than the currently practiced methods using single-pressure stripper. By generating the acid gas at a higher pressure without operating the stripper at greater temperature, the method reduces the energy consumption of systems in which the carbon dioxide must be compressed for sequestration, methanol production, tertiary oil recovery, or other applications.    DETAILED DESCRIPTION - Removing acid gas from a gaseous stream includes passing acid gas-rich solvent stream exiting an absorbing equipment through a multi-pressure stripper in which the acid gas-rich solvent stream passes through flash stages so that the vapor obtained by flashing the acid gas-rich solvent stream in each flash stage strips the acid gas from the acid gas-rich solvent stream, resulting in an acid gas-rich gaseous stream and an acid gas-lean solvent stream exiting the multi-pressure stripper. The multi-pressure stripper is operated at different pressure levels such that the vapor obtained in each flash stage is compressed in a compressor and fed to the previous flash stage at a higher pressure. The acid gas-lean solvent stream exiting the multi-pressure stripper is recycled back to the absorption equipment at least once.    An INDEPENDENT CLAIM is also included for a stripping equipment comprising a multi-pressure stripping column (51) including flash stages (52, 55, 59), and compressor(s) (53, 57, 61) connected between each of the flash stages such that vapor produced in each flash stage is compressed and fed to the previous flash stage at a higher pressure.    DESCRIPTION OF DRAWING(S) - The figure is a schematic drawing of carbon dioxide capture by potassium carbonate absorption/stripping utilizing multi-pressure stripping.    Absorption column (46)    Multi-pressure stripping column (51)    Flash stages (52, 55, 59)    Compressors (53, 57, 61, 62)