Title:
PROCESS AND APPARATUS FOR SEPARATION OF NITROGEN FROM LNG
Document Type and Number:
WIPO Patent Application WO/2011/064605
Kind Code:
A3
Abstract:
The present application is concerned with processes and apparatuses for the separation of nitrogen from liquefied natural gas feeds. The processes comprise the steps of: (i) cooling (202) the feed (201) and passing the feed to a fractionation column (206); (ii) withdrawing from the fractionation column an overhead vapour stream (213) having an enriched nitrogen content, and a liquid stream (207) having a reduced nitrogen content; (iii) dividing the overhead vapour stream from step (ii) into at least first (218) and second (215) overhead streams; (iv) compressing (219), cooling (214,202) and at least partially condensing at least the first overhead stream (218) from step (iii); and (v) expanding (226) the stream from step (iv) and passing the expanded stream to the fractionation column as reflux (227), and wherein cooling in step (iv) is provided, at least in part, by heat exchange with one or more streams (213,240) from the fractionation column (206).
Inventors:
FINN ADRIAN (GB)
JOHNSON GRANT (GB)
TOMLINSON TERENCE (GB)
JOHNSON GRANT (GB)
TOMLINSON TERENCE (GB)
Application Number:
PCT/GB2010/051997
Publication Date:
April 04, 2013
Filing Date:
November 30, 2010
Export Citation:
Assignee:
COSTAIN OIL GAS & PROCESS LTD (GB)
FINN ADRIAN (GB)
JOHNSON GRANT (GB)
TOMLINSON TERENCE (GB)
FINN ADRIAN (GB)
JOHNSON GRANT (GB)
TOMLINSON TERENCE (GB)
International Classes:
F25J3/02
Foreign References:
| US20040231359A1 | 2004-11-25 | |||
| US20090277217A1 | 2009-11-12 | |||
| US20080016908A1 | 2008-01-24 | |||
| CN1293232A | 2001-05-02 | |||
| EP0725256A1 | 1996-08-07 | |||
| US5617741A | 1997-04-08 |
Attorney, Agent or Firm:
HAMER, Christopher (120 HolbornLondon, Greater London EC1N 2SQ, GB)
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