EP 0081849 B1 19870701 - SEPARATION PROCESS AND DEVICE FOR SYNTHESIS OFF-GAS
Title (en)
SEPARATION PROCESS AND DEVICE FOR SYNTHESIS OFF-GAS
Publication
Application
Priority
DE 3149846 A 19811216
Abstract (en)
[origin: US4473385A] In a low temperature process for the fractionation of ammonia synthesis waste gas (N2, H2, Ar, CH4) comprising two successive separating stages and a nitrogen refrigeration cycle for supplying reboiler heat to each of the stages and also liquid nitrogen, wherein nitrogen is compressed in a compressor to a final pressure, cooled, expanded, and partially liquefied, gaseous and revaporized liquid nitrogen being recompressed, the improvement comprising compressing the nitrogen to a medium pressure, e.g., 6-20 bar, withdrawing a portion of resultant medium-pressure nitrogen from the compressor, compressing remaining medium-pressure nitrogen to the final pressure, e.g., 30-50 bar, cooling resultant medium-pressure nitrogen in parallel with resultant final-pressure nitrogen, further cooling the medium-pressure nitrogen by supplying reboiler heat to the two separating columns, expanding resultant cooled medium-pressure nitrogen to at least partially liquefy the same, expanding resultant cooled final-pressure nitrogen to at least partially liquefy the same, and combining both resultant at least partially liquefied nitrogen streams in a phase separator.
IPC 1-7
IPC 8 full level
F25J 3/02 (2006.01)
CPC (source: EP US)
F25J 3/0219 (2013.01 - EP US); F25J 3/0233 (2013.01 - EP US); F25J 3/0252 (2013.01 - EP US); F25J 3/0257 (2013.01 - EP US); F25J 3/0285 (2013.01 - EP US); F25J 2200/02 (2013.01 - EP US); F25J 2200/30 (2013.01 - EP US); F25J 2200/74 (2013.01 - EP US); F25J 2200/76 (2013.01 - EP US); F25J 2205/04 (2013.01 - EP US); F25J 2210/20 (2013.01 - EP US); F25J 2215/04 (2013.01 - EP); F25J 2270/02 (2013.01 - EP US); F25J 2270/04 (2013.01 - EP US); F25J 2270/42 (2013.01 - EP US); F25J 2270/90 (2013.01 - EP US); Y10S 62/934 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0081849 A2 19830622; EP 0081849 A3 19860312; EP 0081849 B1 19870701; DE 3149846 A1 19830721; DE 3276671 D1 19870806; IN 158298 B 19861011; US 4473385 A 19840925
DOCDB simple family (application)
EP 82111608 A 19821214; DE 3149846 A 19811216; DE 3276671 T 19821214; IN 1448CA1982 A 19821215; US 44979482 A 19821214