Patent ID: 8240509

Claim:
A pressure vessel for receiving a pressurized substance in gaseous, liquid or finely particulate form, said pressure vessel comprising: a wall with an inner wall face that defines an interior space of the pressure vessel; and a separating part located in the interior space and dividing the interior space into a storage chamber and into a propellant chamber, wherein the storage chamber contains the substance and the propellant chamber contains a propellant, wherein the separating part is configured to permit liquid-tight division into the storage chamber and the propellant chamber and, under the action of the propellant, is configured to vary the ratio of the volume of the storage chamber to the volume of the propellant chamber in favour of the volume of the propellant chamber, and wherein the propellant comprises: a) a gas phase comprising carbon dioxide, and b) a liquid phase comprising (i) a compound, chosen from the group consisting of polyethylene glycols, their (C 1 -C 4 ) monoethers, and their (C 1 -C 4 ) diethers, and (ii) carbon dioxide dissolved therein.