| abstract |
The invention relates to a process for the production of gaseous pressure product and optionally also of cryogenic liquid product by low-temperature decomposition of air, whereby (a) cleaned feed air is cooled under excess pressure, partially liquefied and subjected to rectification to obtain gaseous and liquid fractions, (b) which The cold required for this is generated in an air-cooling circuit by compressing air in the cooling circuit and relieving work, removing heat from the air and heating the air in counterflow with the feed air to be cooled and then recompressing it or by relaxing some of the work Air, partially liquefied by a subsequent isenthalpic expansion, is fed to the rectification, (c) the feed air cooled in countercurrent, likewise isenthalpically expanded, partially liquefied, is fed to the rectification, (d) cryogenic liquid at least one the liquid fractions from the rectification under elevated pressure are evaporated by indirect heat exchange with feed air, warmed up and obtained as a gaseous pressure product, and (e) if necessary, cryogenic liquid is also partially generated, temporarily stored or stored as a liquid product. The invention also relates to a device for this. DOLLAR A According to the invention, in the case of a gas operation of the plant with little or no production of liquid product, the production of the ... |