Global Patent Index - EP 0768503 A3

EP 0768503 A3 19980204 - Triple column air separation process

Title (en)

Triple column air separation process

Title (de)

Dreifachsäulenverfahren zur Tieftemperaturzerlegung von Luft

Title (fr)

Procédé de séparation d'air à triple colonne

Publication

EP 0768503 A3 19980204 (DE)

Application

EP 96116124 A 19961009

Priority

DE 19537913 A 19951011

Abstract (en)

[origin: EP0768503A2] Process for the refrigerated separation of air in a 3 column system comprising a high (7), a medium (8) and a low pressure column (9), having the following steps: (a) Compression (2) of inlet air (1) to a first pressure. (b) Feeding of a first portion (101,103,104) of the compressed air (3) to the high pressure column (7), where this air is compressed (5,102) to a second pressure at least equal to the operating pressure of the high pressure column. (c) Feeding of a second portion (201,202) of air to the medium pressure column (8). (d) Work generating expansion (305) of a third portion (301,303,304) of air. (e) Feeding of expanded air (306) to the low pressure column (9). (f) Feeding (19) of at least one portion of a first oxygen enriched sump fraction (18) from the high to the low pressure column. (g) Condensation (11) of a first nitrogen enriched tops fraction (10) from the high pressure column and feeding condensate from this as reflux to the low pressure column. (h) Feeding (28) of at least one portion of a second oxygen enriched sump fraction (26) from the medium to the low pressure column. (i) Condensation (22) of a second nitrogen enriched tops fraction from the medium pressure column and feeding this condensate as reflux to the low pressure column. (j) The first pressure is lower than the operating pressure of the medium pressure column. (k) The second portion of feed air is compressed from a first to a third pressure, which is at least equal to the operating pressure of the medium pressure column, but lower than the second pressure. Also claimed is a device to carry out the above process.

IPC 1-7

F25J 3/04

IPC 8 full level

F25J 3/04 (2006.01)

CPC (source: EP US)

F25J 3/04303 (2013.01 - EP US); F25J 3/04448 (2013.01 - EP US); F25J 3/04878 (2013.01 - EP US); Y10S 62/90 (2013.01 - EP); Y10S 62/939 (2013.01 - EP)

Citation (search report)

Designated contracting state (EPC)

DE ES FR GB IT

DOCDB simple family (publication)

EP 0768503 A2 19970416; EP 0768503 A3 19980204; EP 0768503 B1 20010725; DE 19537913 A1 19970417; DE 59607348 D1 20010830; US 5730004 A 19980324

DOCDB simple family (application)

EP 96116124 A 19961009; DE 19537913 A 19951011; DE 59607348 T 19961009; US 72837196 A 19961010