EP 2215415 A2 20100811 - THERMOSYPHON REBOILER FOR THE DENITROGENATION OF LIQUID NATURAL GAS
Title (en)
THERMOSYPHON REBOILER FOR THE DENITROGENATION OF LIQUID NATURAL GAS
Title (de)
WÄRMESIPHON-VERDAMPFER ZUR DENITROGENIERUNG VON FLÜSSIGEM ERDGAS
Title (fr)
REBOUILLEUR À THERMOSIPHON POUR LA DÉNITROGÉNATION DE GAZ NATUREL LIQUIDE
Publication
Application
Priority
- IB 2008003303 W 20081128
- US 94982807 A 20071204
Abstract (en)
[origin: US2009139263A1] Processes are provided for the denitrogenation of a crude LNG stream. A crude LNG stream is expanded and then cooled in a thermosyphon reboiler. The resultant crude LNG stream is introduced into a nitrogen rejection column, wherein the nitrogen content of the LNG is reduced as the liquid flows down the column. A nitrogen-enriched vapor stream is withdrawn from the top of the column, and a first, and optionally a second, nitrogen-diminished liquid stream is withdrawn from the bottom of the column. The first stream may be recovered as a LNG product, and the second stream is passed through the thermosyphon reboiler, cooling the crude LNG stream, while partially vaporizing the second stream. The vaporized second stream is reinjected into the column at a level above the level of withdrawal of the second nitrogen-diminished bottoms LNG stream to provide column boilup. Alternatively, the thermosyphon reboiler is placed within the column.
IPC 8 full level
F25J 3/02 (2006.01)
CPC (source: EP US)
F25J 3/0209 (2013.01 - EP US); F25J 3/0233 (2013.01 - EP US); F25J 3/0257 (2013.01 - EP US); F25J 2200/02 (2013.01 - EP US); F25J 2200/70 (2013.01 - EP US); F25J 2215/04 (2013.01 - EP US); F25J 2240/30 (2013.01 - EP US); F25J 2250/02 (2013.01 - EP US); F25J 2290/40 (2013.01 - EP US)
Citation (search report)
See references of WO 2009071977A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA MK RS
DOCDB simple family (publication)
US 2009139263 A1 20090604; AU 2008332869 A1 20090611; CN 102439384 A 20120502; EP 2215415 A2 20100811; JP 2011517322 A 20110602; RU 2010127280 A 20120110; WO 2009071977 A2 20090611; WO 2009071977 A3 20110526
DOCDB simple family (application)
US 94982807 A 20071204; AU 2008332869 A 20081128; CN 200880118944 A 20081128; EP 08856437 A 20081128; IB 2008003303 W 20081128; JP 2010536542 A 20081128; RU 2010127280 A 20081128