TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: During part of the second operation, air is taken from a storage point to the first exchanger and thence to the column system, and, optionally, during the first operation, compressed air is sent to the storage point. Preferably the purification units comprises the air storage unit. All the liquid to be pressurized is stored in a second storage container (19). During the first operation, a flow rate of liquid, smaller than that sent in the second operation, is conveyed to the second exchanger, where it vapourizes to form a pressurised gas.One of the liquids to be pressurised is rich in O2, N2, H2, He, CH4 or CO; the liquid is pressurized by a pump. During the second operation, air is sent directly from the primary storage unit to the first exchanger, and in a third operation, all the pressurised liquid is sent to the second exchanger with no air supplied to the first exchanger. During the second operation, part of the heat necessary for vaporization of the liquid is obtained from the thermal inertia of the first exchanger.Preferred Installation: The installation comprises:(1) a primary storage unit;(2) a pump;(3) a primary exchanger;(4) a second exchanger;(5) a compressor;(6) a purification unit;(7) a super compressor;(8) reservoir for storage of pressurized air connected to the supercompressor.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: During part of the second operation, air is taken from a storage point to the first exchanger and thence to the column system, and, optionally, during the first operation, compressed air is sent to the storage point. Preferably the purification units comprises the air storage unit. All the liquid to be pressurized is stored in a second storage container (19). During the first operation, a flow rate of liquid, smaller than that sent in the second operation, is conveyed to the second exchanger, where it vapourizes to form a pressurised gas.One of the liquids to be pressurised is rich in O2, N2, H2, He, CH4 or CO; the liquid is pressurized by a pump. During the second operation, air is sent directly from the primary storage unit to the first exchanger, and in a third operation, all the pressurised liquid is sent to the second exchanger with no air supplied to the first exchanger. During the second operation, part of the heat necessary for vaporization of the liquid is obtained from the thermal inertia of the first exchanger.Preferred Installation: The installation comprises:(1) a primary storage unit;(2) a pump;(3) a primary exchanger;(4) a second exchanger;(5) a compressor;(6) a purification unit;(7) a super compressor;(8) reservoir for storage of pressurized air connected to the supercompressor. EXAMPLE - None given.