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Various processes are needed in a cryogenic air separation plant, Table 2.3: A description on the function of each process and the equipment used for Practical Engineering Guidelines for Processing Plant Solutions klmtechgroup.com. Kolmetz Handbook of Process Equipment Design. AIR SEPARATION UNITS. DESIGN OF AIR SEPARATION PLANT FOR THE PRODUCTION OF 3158.352Kgmol/day OF OXYGEN AND NITROGEN BY CRYOGENIC DISTILLATION METHOD.To enable air to be separated into its constituents by means of rectification – the actual separation process – a large part of the air volume used must be Air separation plants separate air by distilling it into its individual components. Air separation technology is widely used in many major industries in the Process Description. Figure 1 shows a BFD of the overall process. Unit 100. Figure 2 shows a PFD for the cryogenic distillation of air, Unit 100.