Global Patent Index - EP 0955509 B1

EP 0955509 B1 2004-12-22 - Process and apparatus to produce high purity nitrogen

Title (en)

Process and apparatus to produce high purity nitrogen

Title (de)

Verfahren und Vorrichtung zur Gewinnung von hochreinem Sauerstoff

Title (fr)

Procédé et appareil pour la production d'oxygène à haute pureté

Publication

EP 0955509 B1 (DE)

Application

EP 98116041 A

Priority

DE 19819338 A

Abstract (en)

[origin: EP0955509A1] A low temperature air rectification process and assembly for the production of nitrogen has a pressurised column (4) and a low pressure column (5). Process air (1, 3; 1, 3') is introduced to the pressurised column (4) which subsequently discharges an oxygen-enriched fraction (11) into the low pressure column (5). Gaseous nitrogen (18) is discharged from the low pressure column (5) into a condenser head (17), where it is at least partly condensed by indirect heat exchange with an evaporating fluid (13; 13', 44). Gaseous nitrogen (24,24', 25, 29) is discharged from the low-pressure column (5) at a pressure which is higher than the operating pressure of the low-pressure column (5). Part of the liquid nitrogen generated by indirect heat exchange in the condenser head (17), or part of the liquid nitrogen (20) drawn from the low-pressure column (5), is in liquid condition to a pressure (21) which exceeds that the pressure in the low-pressure column (5). The resulting pressurised nitrogen is then evaporated in a product evaporator (23) by indirect heat exchange supplied by another medium (35, 35') to be surrendered as compressed nitrogen (24, 24', 25, 29). The product evaporator can be located inside or outside the columns.

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 3/04412 (2013.01); F25J 3/04084 (2013.01); F25J 3/0409 (2013.01); F25J 3/04206 (2013.01); F25J 3/04212 (2013.01); F25J 3/04284 (2013.01); F25J 3/0429 (2013.01); F25J 3/04296 (2013.01); F25J 3/04309 (2013.01); F25J 3/04315 (2013.01); F25J 2200/54 (2013.01); F25J 2200/90 (2013.01); F25J 2215/44 (2013.01); F25J 2235/42 (2013.01); F25J 2245/42 (2013.01); F25J 2250/04 (2013.01); F25J 2250/20 (2013.01); F25J 2250/42 (2013.01)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 0955509 A1 19991110; EP 0955509 B1 20041222; JP 4450886 B2 20100414; JP H11351738 A 19991224; US 6196022 B1 20010306

INPADOC legal status


2011-07-29 [PG25 FR] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: FR

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20100831

2011-05-20 [REG FR ST] NOTIFICATION OF LAPSE

- Effective date: 20110502

2010-11-30 [PG25 GB] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: GB

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20090825

2010-07-30 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: DE

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20100302

2010-04-28 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

- Effective date: 20090825

2009-10-30 [PGFP FR] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: FR

- Payment date: 20090814

- Year of fee payment: 12

2008-12-31 [PGFP GB] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: GB

- Payment date: 20080903

- Year of fee payment: 11

2008-10-31 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: DE

- Payment date: 20080905

- Year of fee payment: 11

2008-10-03 [REG FR CA] CHANGE OF ADDRESS

2005-12-14 [26N] NO OPPOSITION FILED

- Effective date: 20050923

2005-11-04 [ET] FR: TRANSLATION FILED

2005-04-13 [GBT] GB: TRANSLATION OF EP PATENT FILED (GB SECTION 77(6)(A)/1977)

- Effective date: 20050318

2005-01-27 [REF] CORRESPONDS TO:

- Document: DE 59812412 P 20050127

2004-12-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB

2004-12-22 [REG GB FG4D] EUROPEAN PATENT GRANTED

- Free text: NOT ENGLISH

2002-08-07 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020628

2000-07-19 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FR GB

1999-12-08 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19991012

1999-11-10 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB

1999-11-10 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI