Part-I - Controller General of Patents Designs and Trademarks

(12) PATENT APPLICATION PUBLICATION (21) Application No.1021/CHE/2012 A
(19) INDIA
(22) Date of filing of Application :20/03/2012 (43) Publication Date : 21/06/2013
(54) Title of the invention : METHOD AND DEVICE FOR GENERATING AN OXYGEN PRODUCT BY LOW-
TEMPERATURE SEPARATION OF AIR
(51) International classification :F25J
(31) Priority Document No :11002364.5
(32) Priority Date :22/03/2011
(33) Name of priority country :EPO
(86) International Application No
:NA
Filing Date
:NA
(87) International Publication No : NA
(61) Patent of Addition to Application Number :NA
Filing Date
:NA
(62) Divisional to Application Number
:NA
Filing Date
:NA
(71)Name of Applicant :
1)Linde Aktiengesellschaft
Address of Applicant :Klosterhofstr. 1 80331 M¼nchen
Germany
(72)Name of Inventor :
1)GERHARD Pompl
2)GEORG Demski
3)ALEXANDER Alekseev
(57) Abstract :
The method and device serve for generating an oxygen product by low-temperature separation of air having a distillation column
system for nitrogen-oxygen separation that comprises a high-pressure column (6) and a low-pressure column (7) which contain
mass-transfer sections. A feed air stream (1, 3, 5) is cooled in a main heat exchanger (2) and introduced into the high-pressure
column (6). An oxygen-enriched product stream (28) is taken off from the lower region of the low-pressure column (7), warmed
in the main heat exchanger (2) and obtained as oxygen product (29). Liquid that drains off from the lowest mass-transfer section
(32) of the low-pressure column (7) is introduced into a main condenser (8) that is constructed as a bath evapourator and
condenser-evapourator. Between the bottom end of the lowest mass-transfer section (32) of the low-pressure column (7) and the
main condenser (8) there is arranged a liquid buffer (33) . In the event of a reduction in load, liquid is introduced into the liquid
buffer (33) and is stored there. In the event of an increase in load, liquid stored in the liquid buffer (33) is introduced (34) into the
main condenser (8).
No. of Pages : 16 No. of Claims : 7
The Patent Office Journal 21/06/2013 13641