Multistage piston compressor

A multistage ionic piston compressor for a gaseous or cryogenically liquefied medium with at least two compressor stages, which operatively interact with a shared drive train for purposes of joint powering, wherein each compressor stage exhibits a piston that is mechanically connected with the drive train, and arranged in a compressor cylinder so that it can longitudinally shift, characterized in that the piston of the respective compressor stage is in contact with a first liquid column of an incompressible liquid situated in the compressor cylinder, which converts a piston stroke motion of the piston into a motion of a compressor piston arranged in an upper portion of the compressor cylinder so that it can longitudinally shift, wherein the first liquid column of the incompressible liquid is arranged in the compressor cylinder between the piston and the compressor piston, and that the compressor piston of the respective compressor stage is in contact with a second liquid column of an ionic operating liquid that is situated in the compressor cylinder, wherein the second liquid column of the ionic operating liquid is arranged in the compressor cylinder on the top of the compressor piston and wherein the second liquid column of the ionic operating liquid is in direct contact with the medium and used to compress the medium, wherein the compressor piston is designed as a phase separator separating the first liquid column and the second liquid column, wherein the first liquid column for changing a compressor stroke of the compressor piston can be connected with an outlet.