Device and process intended for two-phase compression of a gas soluble in a solvent

A process which provides energy to fluids including and essentially gaseous fluid and an essentially liquid fluid, at least one of the fluids being miscible in at least one of the other fluids, and which mixes the fluids, comprising:

• inputting the essentially gaseous fluid and the essentially liquid fluid into a two-phase compression element;
• mixing the inputted essentially gaseous fluid and essentially liquid fluid in the two-phase compression element including shearing the fluids between at least one impeller and at least one diffuser of the two-phase compression element and delivering energy to each of the fluids within the two-phase compression element;
• withdrawing a part of the inputted essentially gaseous fluid and essentially liquid fluid after passage through a compression stage of the two-phase compression element;
• refrigerating the withdrawn part of the inputted essentially gaseous fluid and essentially liquid fluid;
• sending the refrigerated withdrawn part of the inputted essentially gaseous fluid and essentially liquid fluid inside the two-phase compression element;
• and
• outputting, after mixing and refrigerating the fluids, at an outlet of the two-phase compression element pressurized essentially liquid or pressurized liquid.