发明名称 |
DUAL STAGE NITROGEN REJECTION FROM LIQUEFIED NATURAL GAS |
摘要 |
Nitrogen is removed from a liquefied natural gas feed (41) by a two stage separation in which the liquefied natural gas (41) is first fractionated (23) to provide a first nitrogen-enriched overhead vapour stream (46) and a nitrogen-containing bottoms liquid stream (19) and then at least a portion of said bottoms liquid stream (19) is fractionated (25) to provide a second nitrogen-enriched overhead vapour stream (36) that is of lower purity than said first overhead vapour stream (46) and a purified liquefied natural gas stream (50). Preferably, the first fractionation is conducted in a distillation column (23) refluxed (45) with nitrogen overhead (43) condensed in a condenser (24) located in a flash drum (25) in which the second fractionation is conducted. The provision of two nitrogen-containing streams (26, 36) of different concentration permits control of the nitrogen content of fuel gas for use in the natural gas liquefaction plant. |
申请公布号 |
CA2605545(A1) |
申请公布日期 |
2006.10.26 |
申请号 |
CA20062605545 |
申请日期 |
2006.04.18 |
申请人 |
AIR PRODUCTS AND CHEMICALS, INC. |
发明人 |
SPILSBURY, CHRISTOPHER GEOFFREY |
分类号 |
F25J3/02;F25J1/02 |
主分类号 |
F25J3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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