Title:
METHOD AND DEVICE FOR SEPARATING AIR BY CRYOGENIC DISTILLATION
Document Type and Number:
WIPO Patent Application WO/2015/082860
Kind Code:
A3
Abstract:
The invention relates to a method for separating air by cryogenic distillation in which air (1, 7) is compressed to a first pressure, purified, cooled in a heat exchanger (17) and sent for separation to a double column (31, 33), at least one portion (9) of the purified air exits at an intermediate level of the heat exchanger, is supercharged in at least one supercharger (13, 15), having a variable compression rate at an intermediate temperature of the heat exchanger, is sent back to the heat exchanger in order to cool down and is sent to the system of columns, and if the compression rate of the at least one supercharger is above a threshold, no flow of gaseous oxygen (55) is drawn from the system of columns and if the compression rate of the at least one supercharger is below the threshold, a flow of gaseous oxygen is drawn from the low-pressure column (33) and reheated in the heat exchanger.
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Inventors:
DEMOLLIENS BERTRAND (FR)
Application Number:
PCT/FR2014/053187
Publication Date:
December 10, 2015
Filing Date:
December 05, 2014
Export Citation:
Assignee:
AIR LIQUIDE (FR)
International Classes:
F25J3/04
Foreign References:
| FR2831249A1 | 2003-04-25 | |||
| EP0689019A1 | 1995-12-27 | |||
| DE102007042462A1 | 2008-10-30 | |||
| EP2520886A1 | 2012-11-07 | |||
| US20090241595A1 | 2009-10-01 | |||
| FR2895068A1 | 2007-06-22 |
Other References:
MACCONNELL: "Chapter 8.37 - Separation Controls, Air", 1 January 2006 (2006-01-01), pages 2123 - 2136, XP055173780, Retrieved from the Internet [retrieved on 20150304]
Attorney, Agent or Firm:
MERCEY, Fiona (Département de la Propriété Intellectuelle7, Quai d'Orsay Paris Cedex 07, FR)
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