EP 1026464 A1 20000809 - Air separation process by cryogenic distillation
Title (en)
Air separation process by cryogenic distillation
Title (de)
Luftzerlegungverfahren durch Tieftemperaturrektifikation
Title (fr)
Procédé de séparation d'air par distillation cryogénique
Publication
Application
Priority
FR 9901097 A 19990201
Abstract (en)
During cryogenic air distillation, cyclically and at intervals in a second phase, at least part of the plant gas output is sent to first passage(s) to regenerate them. The first air flow is then returned into one or more third passages (C) of the heat exchange system, which have been cleared by the plant gas, leaving them free of all impurities. An Independent claim is included for the corresponding air distillation plant. Preferred features: The first air flow (100) is sent to the heat exchange system (11), at a pressure lower than that at which the second flow (200) enters the second exchanger. At least part of the first airflow cooled in the exchanger, feeds a column (5) operating at a pressure at least 0.5 bar lower than the mean. This column is a mixer-column operating at a pressure between the mean and that of the low pressure column. During the second phase, nitrogen-rich gas from the low- or medium pressure column and/or a gas enriched in oxygen originating from the mixer column and/or a gas rich in argon from an argon column is reheated in the first passage(s) (A) or cools the first flow (100) in the first phase. At least part of the first airflow is extracted at an intermediate point of the heat exchange system (11). A variant method and further operational details, based on the foregoing principles, are described.
Abstract (fr)
Dans un procédé de séparation d'air dans une installation comprenant au moins deux colonnes (1,3), une partie de l'air (100) à une pression intermédiaire se refroidit dans au moins un passage d'un système d'échange thermique qui est régénéré (sont régénérés) par un gaz de l'installation (17,21) qui peut contenir au moins 50 % d'oxygène. Le reste de l'air à la moyenne pression (200) est soit épuré en dehors de système d'échange thermique soit envoyé dans un passage qui est épuré de la même manière. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP US)
F25J 3/04163 (2013.01 - EP); F25J 3/04169 (2013.01 - EP US); F25J 3/04303 (2013.01 - EP US); F25J 3/04466 (2013.01 - EP US); F25J 2200/06 (2013.01 - EP US); F25J 2205/24 (2013.01 - EP US); F25J 2235/50 (2013.01 - EP US); Y10S 62/908 (2013.01 - EP US); Y10S 62/909 (2013.01 - EP US)
Citation (search report)
- [X] EP 0757217 A1 19970205 - BOC GROUP PLC [GB]
- [DA] US 5802872 A 19980908 - BILLINGHAM JOHN FREDRIC [US], et al
- [DA] EP 0698772 A1 19960228 - BOC GROUP INC [US]
- [DA] EP 0531182 A1 19930310 - AIR LIQUIDE [FR]
- [DA] EP 0229803 A1 19870729 - AIR LIQUIDE [FR]
- [A] US 5471843 A 19951205 - CHRETIEN DENIS [FR]
- [A] US 5778700 A 19980714 - LEE RONG-JWYN [US], et al
- [A] DE 1117616 B 19611123 - LINDE EISMASCH AG
- [A] FR 1426146 A 19660128 - LINDES EISMASCHINEN AG
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 1026464 A1 20000809; CA 2297475 A1 20000801; FR 2789162 A1 20000804; FR 2789162 B1 20011109; JP 2000230776 A 20000822; US 6295835 B1 20011002
DOCDB simple family (application)
EP 00400235 A 20000131; CA 2297475 A 20000128; FR 9901097 A 19990201; JP 2000022563 A 20000131; US 49570100 A 20000201