Loading patent…
AssigneeAir Products and Chemicals, Inc.
InventorsRakesh Agrawal, Zbigniew Tadeusz Fidkowski, Donn Michael Herron
Estimating the term…
A process is set forth for the cryogenic distillation of an air feed to produce an oxygen product, particularly an oxygen product at moderate purity (80-99%, preferably 85-95%). The process uses an auxiliary low pressure column in addition to the conventional high pressure column and low pressure column. The auxiliary low pressure column, which is preferably operated at the same pressure as the main low pressure column and which is heat integrated with the top of the high pressure column by means of its bottom reboiler/condenser, pretreats the crude liquid oxygen from the bottom of the high pressure column. The resulting overhead vapor stream and bottom stream are subsequently fed to the main low pressure column. Preferably, the bottom stream is fed to the main low pressure column in a state which is at least partially vapor.
A process for the cryogenic distillation of an air feed to produce an oxygen product using a distillation column system comprising a high pressure column, a main low pressure column and an auxiliary low pressure column, said process comprising:
Dependencies are inferred from the claim text.