Global Patent Index - EP 0709632 B1

EP 0709632 B1 2001-05-16 - Air separation method and apparatus for producing nitrogen

Title (en)

Air separation method and apparatus for producing nitrogen

Title (de)

Lufttrennungsverfahren und Vorrichtung zur Herstellung von Stickstoff

Title (fr)

Procédé et dispositif pour la production d'azote par séparation d'air

Publication

EP 0709632 B1 (EN)

Application

EP 95307528 A

Priority

  • US 32903594 A
  • US 37406095 A
  • US 45994695 A

Abstract (en)

[origin: EP0709632A2] Air is separated in a distillation column 30 into an oxygen-rich liquid bottom fraction and a nitrogen-rich head vapour fraction. A stream 50 of the oxygen-rich fraction is partially vaporised in a vaporiser 54 and subjected to phase separation in a phase separator 56. The resulting liquid phase 58 is reduced in pressure by passage through valve 60 and employed to cool head condenser 42 which condenses a part of the nitrogen rich head fraction to provide reflux for the column 30. A stream of vapour 62 flows from the phase separator 56 and is expanded by a turboexpander 64 with the performance of work. Nitrogen product is withdrawn from the top of the column 30 as stream 68. In an alternative embodiment (Figure 2) the stream 50 is divided, one part flowing to the valve 60 without being partially vaporised, and the other part being totally vaporised and sent to the turboexpander. <IMAGE>

IPC 1-7 (main, further and additional classification)

F25J 3/04

IPC 8 full level (invention and additional information)

F25J 3/04 (2006.01)

CPC (invention and additional information)

F25J 3/0423 (2013.01); F25J 3/04284 (2013.01); F25J 3/044 (2013.01); F25J 2200/50 (2013.01); F25J 2200/72 (2013.01); F25J 2205/02 (2013.01); F25J 2240/48 (2013.01); F25J 2270/02 (2013.01)

Designated contracting state (EPC)

BE DE FR GB IE IT NL SE

EPO simple patent family

EP 0709632 A2 19960501; EP 0709632 A3 19960911; EP 0709632 B1 20010516; AU 3433995 A 19960509; AU 700591 B2 19990107; CA 2159308 A1 19960426; DE 69520922 D1 20010621; DE 69520922 T2 20011206; IL 115348 A 19991130; IL 115348 D0 19951231; JP H08210771 A 19960820; KR 0168707 B1 19990115; TR 199501297 A2 19960621

INPADOC legal status


2002-08-09 [REG FR ST] NOTIFICATION OF LAPSE

2002-08-07 [REG IE MM4A] PATENT LAPSED

2002-07-02 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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- Effective date: 20011024

2002-05-08 [26N] NO OPPOSITION FILED

2002-01-01 [REG GB IF02] EUROPEAN PATENT IN FORCE AS OF 2002-01-01

2001-11-01 [NLV1] NL: LAPSED OR ANNULLED DUE TO FAILURE TO FULFILL THE REQUIREMENTS OF ART. 29P AND 29M OF THE PATENTS ACT

2001-10-24 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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2001-07-06 [ET] FR: TRANSLATION FILED

2001-06-21 [REF] CORRESPONDS TO:

- Document: DE 69520922 20010621

2001-06-13 [REG IE FG4D] EUROPEAN PATENTS GRANTED DESIGNATING IRELAND

2001-05-16 [AK] DESIGNATED CONTRACTING STATES:

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2001-05-16 [PG25 BE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

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1999-06-23 [17Q] FIRST EXAMINATION REPORT

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